WesWorld

List of Light Cruisers

6 inch

CL's Acestus, Brencis, Maturin, Promethius

CL's Cerasus, Ithica, Orestes, Atreus

CL's Ares, Oceanus, Persephone, Artemis

CL's Pioneer, Pursuer, Pelorus, Pyramus, Proserpine, Pegasus

5.1 inch AA

CLAA's Medusa, Minotaur, Hydra, Chimera

CLAA's Nemesis, Talion, Thanatos, Charon, Acheron, Nausicaa, Cydoemus, Hysminai

CLAA's Zerberus, Danaus, Callosus, Raimius

5.5 inch

CL's Caracus, Valencia, Ascanius, Maracaibo (training cruisers)

No longer in service

CL's Medusa, Minotaur, Hydra, Chimera (scrapped)

CL's Eridanus, Duecalion, Ilissus, Phelleus, Lycabettus, Thetis (scrapped)

CL Triumph, Concord, Intrepid, Lively (scrapped)

CLAA Champion (transferred to Colombia 1942) CL Maturia (sunk 1932)

The next class of light cruiser will continue the trend of a light screening cruiser capable of anti-aircraft duties. The class will be slightly larger than the Medusa class and have increased electronics and AA equipment. Eight ships are planned. In addition another class of ships is being designed to replace the older six inch gun designs.

Medusa class CLAA

These ships are a slightly modified version of the nemesis class CLAA. They are ten feet longer, otherwise hull dimensions are nearly identical as is speed. AA is significantly increased with the use of quad mounts over the twins as in the Nemesis class. The electronics outfit and damage control is also greatly improved over the previous class.

Medusa, Atlantean Anti-aircraft cruiser laid down 1944

Displacement:
5,901 t light; 6,213 t standard; 6,996 t normal; 7,622 t full load

Dimensions: Length overall / water x beam x draught
555.36 ft / 538.00 ft x 51.25 ft x 18.50 ft (normal load)
169.27 m / 163.98 m x 15.62 m x 5.64 m

Armament:
12 - 5.10" / 130 mm guns (6x2 guns), 66.33lbs / 30.09kg shells, 1944 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.88kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
48 - 0.79" / 20.0 mm guns (20 mounts), 0.24lbs / 0.11kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 12 raised mounts
Weight of broadside 846 lbs / 384 kg
Shells per gun, main battery: 350
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 344.49 ft / 105.00 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 99 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.79" / 20 mm 1.57" / 40 mm

- Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 62,056 shp / 46,294 Kw = 32.25 kts
Range 9,000nm at 15.00 kts
Bunker at max displacement = 1,409 tons

Complement:
382 - 497

Cost:
£3.480 million / $13.920 million

Distribution of weights at normal displacement:
Armament: 106 tons, 1.5 %
Armour: 1,061 tons, 15.2 %
- Belts: 443 tons, 6.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 47 tons, 0.7 %
- Armour Deck: 546 tons, 7.8 %
- Conning Tower: 25 tons, 0.4 %
Machinery: 1,585 tons, 22.7 %
Hull, fittings & equipment: 3,029 tons, 43.3 %
Fuel, ammunition & stores: 1,095 tons, 15.6 %
Miscellaneous weights: 120 tons, 1.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10,273 lbs / 4,660 Kg = 154.9 x 5.1 " / 130 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 2.3 ft / 0.7 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.43
Seaboat quality (Average = 1.00): 1.28

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.480
Length to Beam Ratio: 10.50 : 1
'Natural speed' for length: 26.43 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.50 ft / 8.08 m
- Forecastle (20 %): 19.00 ft / 5.79 m
- Mid (50 %): 19.00 ft / 5.79 m
- Quarterdeck (15 %): 19.00 ft / 5.79 m
- Stern: 19.00 ft / 5.79 m
- Average freeboard: 19.60 ft / 5.97 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 89.2 %
- Above water (accommodation/working, high = better): 133.3 %
Waterplane Area: 18,756 Square feet or 1,742 Square metres
Displacement factor (Displacement / loading): 135 %
Structure weight / hull surface area: 93 lbs/sq ft or 453 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 2.04
- Overall: 1.10
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Ships in class: Medusa, Minotaur, Hydra, Chimera

Modified Zerberus class or Nemesis class

Ships in class: Nemesis, Talion, Thanatos, Charon, Acheron, Nausicaa, Cydoemus and Hysminai

Modifications made to improve Zerberus design mainly involve reducing top weight by lowering the main gun mounts and superstructure in an effort to increase the number of AA without any negative effect.

Displacement:
5,906 t light; 6,211 t standard; 6,928 t normal; 7,501 t full load

Dimensions: Length overall / water x beam x draught
542.17 ft / 528.00 ft x 51.50 ft x 18.50 ft (normal load)
165.25 m / 160.93 m x 15.70 m x 5.64 m

Armament:
12 - 5.10" / 130 mm guns (6x2 guns), 66.33lbs / 30.08kg shells, 1940 Model
Dual purpose guns in deck mounts with hoists
on centreline, evenly spread, 2 raised mounts
8 - 1.58" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 1.58" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, 1 raised mount
36 - 0.79" / 20.0 mm guns (7x4, 8x1 guns), 0.24lbs / 0.11kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 9 raised mounts
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1940 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 829 lbs / 376 kg
Shells per gun, main battery: 350
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.35" / 60 mm 345.00 ft / 105.16 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 101 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.58" / 40 mm 0.79" / 20 mm 1.58" / 40 mm
2nd: 1.00" / 25 mm - -

- Armour deck: 1.58" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 63,279 shp / 47,206 Kw = 32.39 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 1,291 tons

Complement:
379 - 493

Cost:
£3.184 million / $12.734 million

Distribution of weights at normal displacement:
Armament: 104 tons, 1.5 %
Armour: 944 tons, 13.6 %
- Belts: 331 tons, 4.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 49 tons, 0.7 %
- Armour Deck: 540 tons, 7.8 %
- Conning Tower: 25 tons, 0.4 %
Machinery: 1,692 tons, 24.4 %
Hull, fittings & equipment: 3,086 tons, 44.5 %
Fuel, ammunition & stores: 1,022 tons, 14.8 %
Miscellaneous weights: 80 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9,583 lbs / 4,347 Kg = 144.5 x 5.1 " / 130 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 2.3 ft / 0.7 m
Roll period: 14.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.482
Length to Beam Ratio: 10.25 : 1
'Natural speed' for length: 26.23 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 58
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.20 ft / 7.68 m
- Forecastle (20 %): 19.00 ft / 5.79 m
- Mid (50 %): 19.00 ft / 5.79 m
- Quarterdeck (15 %): 19.00 ft / 5.79 m
- Stern: 19.00 ft / 5.79 m
- Average freeboard: 19.50 ft / 5.94 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 94.0 %
- Above water (accommodation/working, high = better): 132.1 %
Waterplane Area: 18,531 Square feet or 1,722 Square metres
Displacement factor (Displacement / loading): 132 %
Structure weight / hull surface area: 97 lbs/sq ft or 471 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.07
- Longitudinal: 2.14
- Overall: 1.15
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

20 tons for improved gun dirrectors
20 tons for 10x21" torpedo's (mark 10's)
10 tons for torpedo handling equipment
30 tons for Radars

Zerberus, Atlantean Anti-aircraft cruiser laid down 1934


Zerberus (ex-Arcesius), Danaus, Callosus and Raimius (ex-Alcestus)
Cancelled: Pelias, Erastius, Cardea and Tethys

Displacement:
5,719 t light; 5,946 t standard; 6,688 t normal; 7,281 t full load

Dimensions: Length overall / water x beam x draught
539.17 ft / 525.00 ft x 50.00 ft x 18.50 ft (normal load)
164.34 m / 160.02 m x 15.24 m x 5.64 m

Armament:
12 - 5.10" / 130 mm guns (6x2 guns), 66.33lbs / 30.09kg shells, 1934 Model
Dual purpose guns in deck mounts with hoists
on centreline, evenly spread, 4 raised mounts
8 - 1.58" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, all amidships, 2 raised mounts - superfiring
4 - 1.58" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, 1 raised mount
16 - 0.79" / 20.0 mm guns (4x4 guns), 0.24lbs / 0.11kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
12 - 0.50" / 12.7 mm guns (6x2 guns), 0.06lbs / 0.03kg shells, 1934 Model
Machine guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 824 lbs / 374 kg
Shells per gun, main battery: 200
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.35" / 60 mm 345.00 ft / 105.16 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 101 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.58" / 40 mm 0.79" / 20 mm 1.58" / 40 mm
2nd: 1.00" / 25 mm - -

- Armour deck: 1.58" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 62,000 shp / 46,252 Kw = 32.39 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 1,335 tons

Complement:
369 - 480

Cost:
£2.633 million / $10.533 million

Distribution of weights at normal displacement:
Armament: 103 tons, 1.5 %
Armour: 924 tons, 13.8 %
- Belts: 330 tons, 4.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 49 tons, 0.7 %
- Armour Deck: 521 tons, 7.8 %
- Conning Tower: 24 tons, 0.4 %
Machinery: 1,784 tons, 26.7 %
Hull, fittings & equipment: 2,828 tons, 42.3 %
Fuel, ammunition & stores: 969 tons, 14.5 %
Miscellaneous weights: 80 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,635 lbs / 3,917 Kg = 130.2 x 5.1 " / 130 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 2.2 ft / 0.7 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.50
Seaboat quality (Average = 1.00): 1.25

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.482
Length to Beam Ratio: 10.50 : 1
'Natural speed' for length: 26.10 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.20 ft / 7.68 m
- Forecastle (20 %): 19.00 ft / 5.79 m
- Mid (50 %): 19.00 ft / 5.79 m
- Quarterdeck (15 %): 19.00 ft / 5.79 m
- Stern: 19.00 ft / 5.79 m
- Average freeboard: 19.50 ft / 5.94 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 100.5 %
- Above water (accommodation/working, high = better): 129.4 %
Waterplane Area: 17,889 Square feet or 1,662 Square metres
Displacement factor (Displacement / loading): 124 %
Structure weight / hull surface area: 89 lbs/sq ft or 436 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 2.09
- Overall: 1.06
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

20 tons for improved gun dirrectors
20 tons for 10x21" torpedo's (mark 10's)
10 tons for torpedo handling equipment
10 tons for Radar
20 tons for future growth

Orriginal design (since cancelled)

Danaus (Project 416) class

Danaus, Zerberus (renamed, ex-Arcesius), Callosus and Alcestus building
Pelias, Erastius, Cardea and Tethys ordered, order cancelled

Atlantean Anti-Aircraft Cruisers laid down 1934/35

Displacement:
5,695 t light; 5,994 t standard; 6,742 t normal; 7,340 t full load

Dimensions: Length overall / water x beam x draught
539.37 ft / 527.00 ft x 49.50 ft x 19.75 ft (normal load)
164.40 m / 160.63 m x 15.09 m x 6.02 m

Armament:
12 - 5.10" / 130 mm guns (6x2 guns), 66.33lbs / 30.09kg shells, 1934 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 4 raised mounts - superfiring
12 - 1.58" / 40.0 mm guns (6x2 guns), 1.95lbs / 0.88kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread, 3 raised mounts
20 - 0.79" / 20.1 mm guns (6 mounts), 0.25lbs / 0.11kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1934 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 825 lbs / 374 kg
Shells per gun, main battery: 350
12 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.57" / 40 mm 405.00 ft / 123.44 m 8.00 ft / 2.44 m
Ends: Unarmoured
Main Belt covers 118 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.79" / 20 mm 1.57" / 40 mm

- Armour deck: 0.79" / 20 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 74,500 shp / 55,577 Kw = 34.00 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 1,346 tons

Complement:
371 - 483

Cost:
£2.877 million / $11.506 million

Distribution of weights at normal displacement:
Armament: 103 tons, 1.5 %
Armour: 531 tons, 7.9 %
- Belts: 205 tons, 3.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 47 tons, 0.7 %
- Armour Deck: 254 tons, 3.8 %
- Conning Tower: 24 tons, 0.4 %
Machinery: 2,143 tons, 31.8 %
Hull, fittings & equipment: 2,838 tons, 42.1 %
Fuel, ammunition & stores: 1,047 tons, 15.5 %
Miscellaneous weights: 80 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5,909 lbs / 2,680 Kg = 89.1 x 5.1 " / 130 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 2.1 ft / 0.6 m
Roll period: 14.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.51
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.458
Length to Beam Ratio: 10.65 : 1
'Natural speed' for length: 26.20 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 66
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.50 ft / 8.69 m
- Forecastle (12 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (12 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 18.50 ft / 5.64 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 117.9 %
- Above water (accommodation/working, high = better): 109.8 %
Waterplane Area: 17,403 Square feet or 1,617 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 92 lbs/sq ft or 450 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.01
- Longitudinal: 1.97
- Overall: 1.08
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

24 tons for torpedo's
16 tons for DC
10 tons for sonar
10 tons for torpedo and DC handling equipment
20 tons for future growth

Acestus class CL



Acestus, Brencis, Maturin (ex Nereus), Promethius all laid down in 1933, refitted in 1943. Refit details include four twin 40mm and torpedo reloads removed and replaced by 5 quad 40mm and various electronics and damage control equipment.

As refitted in 1943

Acestus, Atlantean Light Cruiser laid down 1933

Displacement:
7,962 t light; 8,303 t standard; 9,370 t normal; 10,224 t full load

Dimensions: Length overall / water x beam x draught
594.99 ft / 577.99 ft x 60.20 ft x 19.55 ft (normal load)
181.35 m / 176.17 m x 18.35 m x 5.96 m

Armament:
12 - 6" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1933 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 3.94" / 100 mm guns (6x2 guns), 30.82lbs / 13.98kg shells, 1933 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, all raised mounts
20 - 1.57" / 40.0 mm guns (5x4 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
24 - 0.79" / 20.0 mm guns (6x4 guns), 0.24lbs / 0.11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1933 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1,711 lbs / 776 kg
Shells per gun, main battery: 150
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.13" / 105 mm 350.00 ft / 106.68 m 9.02 ft / 2.75 m
Ends: Unarmoured
Main Belt covers 93 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.13" / 105 mm 2.95" / 75 mm 3.15" / 80 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm 0.79" / 20 mm

- Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 68,019 shp / 50,742 Kw = 31.70 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 1,922 tons

Complement:
476 - 619

Cost:
£3.472 million / $13.886 million

Distribution of weights at normal displacement:
Armament: 212 tons, 2.3 %
Armour: 1,650 tons, 17.6 %
- Belts: 551 tons, 5.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 378 tons, 4.0 %
- Armour Deck: 691 tons, 7.4 %
- Conning Tower: 30 tons, 0.3 %
Machinery: 1,982 tons, 21.2 %
Hull, fittings & equipment: 4,018 tons, 42.9 %
Fuel, ammunition & stores: 1,408 tons, 15.0 %
Miscellaneous weights: 100 tons, 1.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13,871 lbs / 6,292 Kg = 129.4 x 6.0 " / 152 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 2.7 ft / 0.8 m
Roll period: 15.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.61
Seaboat quality (Average = 1.00): 1.25

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.482
Length to Beam Ratio: 9.60 : 1
'Natural speed' for length: 27.58 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.98 ft / 7.92 m
- Forecastle (18 %): 21.00 ft / 6.40 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (18 %): 21.00 ft / 6.40 m
- Stern: 21.00 ft / 6.40 m
- Average freeboard: 21.36 ft / 6.51 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 87.9 %
- Above water (accommodation/working, high = better): 159.8 %
Waterplane Area: 23,713 Square feet or 2,203 Square metres
Displacement factor (Displacement / loading): 126 %
Structure weight / hull surface area: 105 lbs/sq ft or 511 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.70
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

As laid down in 1933

Acestus, Atlantis Light Cruiser laid down 1933

Displacement:
7,963 t light; 8,301 t standard; 9,368 t normal; 10,222 t full load

Dimensions: Length overall / water x beam x draught
595.01 ft / 578.00 ft x 60.20 ft x 19.55 ft (normal load)
181.36 m / 176.17 m x 18.35 m x 5.96 m

Armament:
12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1933 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 3.95" / 100 mm guns (6x2 guns), 30.81lbs / 13.98kg shells, 1933 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, all raised mounts
10 - 1.58" / 40.0 mm guns (5x2 guns), 1.95lbs / 0.88kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
24 - 0.79" / 20.0 mm guns (6x4 guns), 0.24lbs / 0.11kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1933 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1,691 lbs / 767 kg
Shells per gun, main battery: 150
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.15" / 105 mm 350.00 ft / 106.68 m 9.02 ft / 2.75 m
Ends: Unarmoured
Main Belt covers 93 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.15" / 105 mm 2.95" / 75 mm 3.15" / 80 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm 0.79" / 20 mm

- Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 68,000 shp / 50,728 Kw = 31.70 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 1,922 tons

Complement:
475 - 618

Cost:
£3.468 million / $13.874 million

Distribution of weights at normal displacement:
Armament: 211 tons, 2.3 %
Armour: 1,652 tons, 17.6 %
- Belts: 553 tons, 5.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 380 tons, 4.1 %
- Armour Deck: 689 tons, 7.4 %
- Conning Tower: 30 tons, 0.3 %
Machinery: 1,981 tons, 21.2 %
Hull, fittings & equipment: 4,018 tons, 42.9 %
Fuel, ammunition & stores: 1,405 tons, 15.0 %
Miscellaneous weights: 100 tons, 1.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13,896 lbs / 6,303 Kg = 128.7 x 6.0 " / 152 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 2.7 ft / 0.8 m
Roll period: 15.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.61
Seaboat quality (Average = 1.00): 1.25

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.482
Length to Beam Ratio: 9.60 : 1
'Natural speed' for length: 27.58 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.00 ft / 7.92 m
- Forecastle (18 %): 21.00 ft / 6.40 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (18 %): 21.00 ft / 6.40 m
- Stern: 21.00 ft / 6.40 m
- Average freeboard: 21.35 ft / 6.51 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 87.8 %
- Above water (accommodation/working, high = better): 160.1 %
Waterplane Area: 23,712 Square feet or 2,203 Square metres
Displacement factor (Displacement / loading): 126 %
Structure weight / hull surface area: 105 lbs/sq ft or 511 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.70
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

20 tons for 10x21" torpedo's (mark 9's) plus full reload
10 tons for torpedo handling equipment
70 tons for future growth

CL Cerasus class Atlantean Light Cruisers

Cerasus, Ithica, Orestes, Atreus all laid down in 1928, all refitted in 1942, refit included removal of four twin 3", six triple 20mm mounts, aircraft/catapult and torpedo reloads replaced by four twin 3.95", six quad 20mm and various electronics and damage control equipment added.

As refitted 1942

Cerasus, Atlantean light cruiser laid down 1928 (Engine 1943)

Displacement:
7,514 t light; 7,832 t standard; 9,065 t normal; 10,052 t full load

Dimensions: Length overall / water x beam x draught
589.66 ft / 578.00 ft x 60.00 ft x 19.10 ft (normal load)
179.73 m / 176.17 m x 18.29 m x 5.82 m

Armament:
12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 3.95" / 100 mm guns (4x2 guns), 30.81lbs / 13.98kg shells, 1928 Model
Dual purpose guns in deck mounts
on side, all aft, all raised mounts - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
24 - 0.79" / 20.0 mm guns (6 mounts), 0.24lbs / 0.11kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 18 raised guns
Weight of broadside 1,564 lbs / 709 kg
Shells per gun, main battery: 150
10 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 479.99 ft / 146.30 m 8.20 ft / 2.50 m
Ends: Unarmoured
Main Belt covers 128 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.94" / 100 mm 2.36" / 60 mm 3.15" / 80 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm -

- Armour deck: 1.57" / 40 mm, Conning tower: 1.58" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 70,258 shp / 52,413 Kw = 31.00 kts
Range 10,000nm at 16.00 kts
Bunker at max displacement = 2,220 tons

Complement:
463 - 603

Cost:
£2.601 million / $10.404 million

Distribution of weights at normal displacement:
Armament: 196 tons, 2.2 %
Armour: 1,617 tons, 17.8 %
- Belts: 622 tons, 6.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 320 tons, 3.5 %
- Armour Deck: 661 tons, 7.3 %
- Conning Tower: 15 tons, 0.2 %
Machinery: 1,815 tons, 20.0 %
Hull, fittings & equipment: 3,811 tons, 42.0 %
Fuel, ammunition & stores: 1,552 tons, 17.1 %
Miscellaneous weights: 75 tons, 0.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13,230 lbs / 6,001 Kg = 122.5 x 6.0 " / 152 mm shells or 1.9 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 2.9 ft / 0.9 m
Roll period: 14.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.45
Seaboat quality (Average = 1.00): 1.13

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.479
Length to Beam Ratio: 9.63 : 1
'Natural speed' for length: 24.04 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 62
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (17 %): 19.00 ft / 5.79 m (18.50 ft / 5.64 m aft of break)
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (17 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 18.66 ft / 5.69 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83.2 %
- Above water (accommodation/working, high = better): 135.5 %
Waterplane Area: 22,675 Square feet or 2,107 Square metres
Displacement factor (Displacement / loading): 132 %
Structure weight / hull surface area: 107 lbs/sq ft or 523 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 1.37
- Overall: 1.06
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

As laid down 1928

Displacement:
7,770 t light; 8,074 t standard; 9,065 t normal; 9,858 t full load

Dimensions: Length overall / water x beam x draught
588.10 ft / 578.00 ft x 60.00 ft x 19.10 ft (normal load)
179.25 m / 176.17 m x 18.29 m x 5.82 m

Armament:
12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1928 Model
Quick firing guns in deck mounts
on side, all aft
8 - 1.57" / 40 mm guns (4x2 guns), 1.93lbs / 0.88kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
18 - 0.79" / 20 mm guns (6x3 guns), 0.25lbs / 0.11kg shells, 1928 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 1,424 lbs / 646 kg
Shells per gun, main battery: 150
12 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.95" / 100 mm 480.00 ft / 146.30 m 8.20 ft / 2.50 m
Ends: Unarmoured
Main Belt covers 128 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.95" / 100 mm 2.35" / 60 mm 3.15" / 80 mm
2nd: 0.79" / 20 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 75,000 shp / 55,950 Kw = 31.51 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 1,784 tons

Complement:
463 - 603

Cost:
£2.857 million / $11.430 million

Distribution of weights at normal displacement:
Armament: 178 tons, 2.0 %
Armour: 1,617 tons, 17.8 %
- Belts: 624 tons, 6.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 305 tons, 3.4 %
- Armour Deck: 659 tons, 7.3 %
- Conning Tower: 30 tons, 0.3 %
Machinery: 2,335 tons, 25.8 %
Hull, fittings & equipment: 3,565 tons, 39.3 %
Fuel, ammunition & stores: 1,295 tons, 14.3 %
Miscellaneous weights: 75 tons, 0.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10,924 lbs / 4,955 Kg = 101.1 x 6.0 " / 152 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 2.9 ft / 0.9 m
Roll period: 14.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.41
Seaboat quality (Average = 1.00): 1.07

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.479
Length to Beam Ratio: 9.63 : 1
'Natural speed' for length: 24.04 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.25 ft / 6.78 m
- Forecastle (17 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (17 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 18.29 ft / 5.57 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 100.0 %
- Above water (accommodation/working, high = better): 127.9 %
Waterplane Area: 22,675 Square feet or 2,107 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 101 lbs/sq ft or 492 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.24
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

50 tons for one aircraft and one catapult and one crane
21 tons for 12x21" torpedo's (mark 7's) reloads
4 ton's for future growth

CL Ares class 1926
Ares, Oceanus, Persephone, Artemis


As refited

Ares, Atlantean Light Cruiser laid down 1926, refitted 1936

Displacement:
7,963 t light; 8,240 t standard; 9,133 t normal; 9,847 t full load

Dimensions: Length overall / water x beam x draught
590.37 ft / 575.00 ft x 62.00 ft x 19.20 ft (normal load)
179.95 m / 175.26 m x 18.90 m x 5.85 m

Armament:
10 - 6.00" / 152 mm guns (4 mounts), 108.00lbs / 48.99kg shells, 1926 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 3.95" / 100 mm guns (4x2 guns), 30.81lbs / 13.98kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 1.58" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1926 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
16 - 0.79" / 20.0 mm guns (4x4 guns), 0.24lbs / 0.11kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1936 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1,347 lbs / 611 kg
Shells per gun, main battery: 120
12 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 380.00 ft / 115.82 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 102 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.95" / 100 mm 2.35" / 60 mm 3.15" / 80 mm
2nd: 1.58" / 40 mm 0.79" / 20 mm -

- Armour deck: 1.58" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 75,388 shp / 56,240 Kw = 31.50 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 1,607 tons

Complement:
466 - 607

Cost:
£2.618 million / $10.473 million

Distribution of weights at normal displacement:
Armament: 168 tons, 1.8 %
Armour: 1,525 tons, 16.7 %
- Belts: 491 tons, 5.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 332 tons, 3.6 %
- Armour Deck: 672 tons, 7.4 %
- Conning Tower: 30 tons, 0.3 %
Machinery: 2,413 tons, 26.4 %
Hull, fittings & equipment: 3,756 tons, 41.1 %
Fuel, ammunition & stores: 1,170 tons, 12.8 %
Miscellaneous weights: 100 tons, 1.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
11,699 lbs / 5,306 Kg = 108.3 x 6.0 " / 152 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 3.3 ft / 1.0 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 65 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.18

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.467
Length to Beam Ratio: 9.27 : 1
'Natural speed' for length: 23.98 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.50 ft / 8.69 m
- Forecastle (20 %): 25.00 ft / 7.62 m
- Mid (50 %): 25.00 ft / 7.62 m (15.00 ft / 4.57 m aft of break)
- Quarterdeck (15 %): 15.00 ft / 4.57 m
- Stern: 15.00 ft / 4.57 m
- Average freeboard: 20.28 ft / 6.18 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 101.3 %
- Above water (accommodation/working, high = better): 142.0 %
Waterplane Area: 23,067 Square feet or 2,143 Square metres
Displacement factor (Displacement / loading): 117 %
Structure weight / hull surface area: 103 lbs/sq ft or 502 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.46
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

25 tons for 1 floatplane
25 tons for catapult and crane
23 tons for 12x21" torpedo's (mark 10's)
10 tons for NSAS radar
3 tons for RDF equipment
14 tons for fire control, damage control and generator improvments

---------------------------------------------------------------------------As built

Ares, Oceanus, Persephone, Artemis

Atlantean Light Cruisers laid down 1926

Displacement:
7,973 t light; 8,240 t standard; 9,133 t normal; 9,847 t full load

Dimensions: Length overall / water x beam x draught
580.31 ft / 575.00 ft x 62.00 ft x 19.20 ft (normal load)
176.88 m / 175.26 m x 18.90 m x 5.85 m

Armament:
10 - 6.00" / 152 mm guns (4 mounts), 108.00lbs / 48.99kg shells, 1926 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1926 Model
Anti-aircraft guns in deck mounts with hoists
on side, all amidships
8 - 1.57" / 40 mm guns (4x2 guns), 1.93lbs / 0.88kg shells, 1926 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
12 - 1.00" / 25.4 mm guns (4x3 guns), 0.50lbs / 0.23kg shells, 1926 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 1,209 lbs / 549 kg
Shells per gun, main battery: 120
12 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 380.00 ft / 115.82 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 102 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.95" / 100 mm 2.35" / 60 mm 3.15" / 80 mm
2nd: 1.00" / 25 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 75,388 shp / 56,240 Kw = 31.50 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 1,607 tons

Complement:
466 - 607

Cost:
£2.570 million / $10.280 million

Distribution of weights at normal displacement:
Armament: 151 tons, 1.7 %
Armour: 1,512 tons, 16.6 %
- Belts: 491 tons, 5.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 321 tons, 3.5 %
- Armour Deck: 670 tons, 7.3 %
- Conning Tower: 30 tons, 0.3 %
Machinery: 2,413 tons, 26.4 %
Hull, fittings & equipment: 3,817 tons, 41.8 %
Fuel, ammunition & stores: 1,159 tons, 12.7 %
Miscellaneous weights: 80 tons, 0.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
12,608 lbs / 5,719 Kg = 116.7 x 6.0 " / 152 mm shells or 1.6 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 3.2 ft / 1.0 m
Roll period: 14.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.36
Seaboat quality (Average = 1.00): 1.26

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.467
Length to Beam Ratio: 9.27 : 1
'Natural speed' for length: 23.98 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (20 %): 24.50 ft / 7.47 m (24.00 ft / 7.32 m aft of break)
- Mid (50 %): 24.00 ft / 7.32 m
- Quarterdeck (15 %): 15.00 ft / 4.57 m
- Stern: 15.00 ft / 4.57 m
- Average freeboard: 21.22 ft / 6.47 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 99.6 %
- Above water (accommodation/working, high = better): 156.3 %
Waterplane Area: 23,067 Square feet or 2,143 Square metres
Displacement factor (Displacement / loading): 120 %
Structure weight / hull surface area: 102 lbs/sq ft or 500 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.60
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

25 tons for 1 floatplane
25 tons for catapult and crane
21 tons for 12x21" torpedo's (mark 6's)
9 tons for future growth

Pioneer , Atlantis Heavy Cruiser laid down 1916 reconstructed 1931

In a similar refit to the Medusa class CA's, the Pioneers will be differentiated with the substitution of the twin 3" mounts with 4 twin 4.5" DP mounts and a minor change to the midships AA gun layout. These ships by 1945 are quite worn and will likely be retired from service and scrapped. Plans are being reviewed to prepare two of the class for conversion to test ships to study various weapons and machinery advancements. Its likely these vessels will be replaced by eight vessels.

Pioneer, Pursuer, Pelorus, Pyramus, Proserpine, Pegasus



Displacement:
7,091 t light; 7,394 t standard; 8,443 t normal; 9,283 t full load

Dimensions: Length overall / water x beam x draught
569.46 ft / 565.00 ft x 58.00 ft x 16.70 ft (normal load)
173.57 m / 172.21 m x 17.68 m x 5.09 m

Armament:
8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1931 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 4.50" / 114 mm guns (4x2 guns), 45.56lbs / 20.67kg shells, 1931 Model
Dual purpose guns in deck mounts
on side, evenly spread
6 - 1.58" / 40 mm guns (3x2 guns), 1.96lbs / 0.89kg shells, 1916 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
12 - 0.79" / 20 mm guns (4x3 guns), 0.25lbs / 0.11kg shells, 1916 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1916 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1,244 lbs / 564 kg
Shells per gun, main battery: 180
12 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 400.00 ft / 121.92 m 10.00 ft / 3.05 m
Ends: 1.00" / 25 mm 80.00 ft / 24.38 m 0.00 ft / 0.00 m
85.00 ft / 25.91 m Unarmoured ends
Upper: 1.00" / 25 mm 320.00 ft / 97.54 m 0.00 ft / 0.00 m
Main Belt covers 109 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 1.57" / 40 mm
2nd: 1.00" / 25 mm - -

- Armour deck: 1.25" / 32 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 61,325 shp / 45,749 Kw = 30.00 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 1,890 tons

Complement:
439 - 572

Cost:
£1.143 million / $4.573 million

Distribution of weights at normal displacement:
Armament: 155 tons, 1.8 %
Armour: 1,110 tons, 13.1 %
- Belts: 495 tons, 5.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 64 tons, 0.8 %
- Armour Deck: 524 tons, 6.2 %
- Conning Tower: 27 tons, 0.3 %
Machinery: 2,285 tons, 27.1 %
Hull, fittings & equipment: 3,461 tons, 41.0 %
Fuel, ammunition & stores: 1,352 tons, 16.0 %
Miscellaneous weights: 80 tons, 0.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10,230 lbs / 4,640 Kg = 94.7 x 6.0 " / 152 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.26
Metacentric height 3.4 ft / 1.0 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.30
Seaboat quality (Average = 1.00): 1.08

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.540
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 23.77 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (65 %): 20.00 ft / 6.10 m (11.00 ft / 3.35 m aft of break)
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 16.93 ft / 5.16 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 103.7 %
- Above water (accommodation/working, high = better): 126.6 %
Waterplane Area: 22,657 Square feet or 2,105 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 103 lbs/sq ft or 501 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.12
- Longitudinal: 1.18
- Overall: 1.13
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

25 tons for 1 floatplane
25 tons for catapult and crane
18 tons for 12x21" torpedo's (mark 6's)
12 tons for future growth


Pioneer class CL 1916, orriginal CA configuration

Pioneer, Pursuer, Pelorus, Pyramus, Proserpine,Pegasus
+ one more converted to CVX Active ex Polyeidus


Pioneer , Atlantis Heavy Cruiser laid down 1916

Displacement:
7,212 t light; 7,538 t standard; 8,443 t normal; 9,168 t full load

Dimensions: Length overall / water x beam x draught
569.46 ft / 565.00 ft x 58.00 ft x 16.70 ft (normal load)
173.57 m / 172.21 m x 17.68 m x 5.09 m

Armament:
4 - 7.50" / 191 mm guns in single mounts, 210.94lbs / 95.68kg shells, 1916 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 7.50" / 191 mm guns in single mounts, 210.94lbs / 95.68kg shells, 1916 Model
Breech loading guns in deck mounts
on side, evenly spread
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1916 Model
Quick firing guns in deck mounts
on side, all amidships
8 - 1.00" / 25.4 mm guns (4x2 guns), 0.50lbs / 0.23kg shells, 1916 Model
Quick firing guns in deck mounts
on side, evenly spread
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1916 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 1,746 lbs / 792 kg
Shells per gun, main battery: 150
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 400.00 ft / 121.92 m 10.00 ft / 3.05 m
Ends: 1.00" / 25 mm 80.00 ft / 24.38 m 0.00 ft / 0.00 m
85.00 ft / 25.91 m Unarmoured ends
Upper: 1.00" / 25 mm 320.00 ft / 97.54 m 0.00 ft / 0.00 m
Main Belt covers 109 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - -

- Armour deck: 1.25" / 32 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 61,325 shp / 45,749 Kw = 30.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 1,630 tons

Complement:
439 - 572

Cost:
£1.236 million / $4.946 million

Distribution of weights at normal displacement:
Armament: 218 tons, 2.6 %
Armour: 1,064 tons, 12.6 %
- Belts: 495 tons, 5.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 18 tons, 0.2 %
- Armour Deck: 524 tons, 6.2 %
- Conning Tower: 27 tons, 0.3 %
Machinery: 2,285 tons, 27.1 %
Hull, fittings & equipment: 3,595 tons, 42.6 %
Fuel, ammunition & stores: 1,231 tons, 14.6 %
Miscellaneous weights: 50 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9,331 lbs / 4,233 Kg = 44.2 x 7.5 " / 191 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.27
Metacentric height 3.4 ft / 1.0 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.37
Seaboat quality (Average = 1.00): 1.08

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.540
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 23.77 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (65 %): 20.00 ft / 6.10 m (11.00 ft / 3.35 m aft of break)
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 16.93 ft / 5.16 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 108.7 %
- Above water (accommodation/working, high = better): 148.0 %
Waterplane Area: 22,657 Square feet or 2,105 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 107 lbs/sq ft or 521 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.14
- Longitudinal: 1.23
- Overall: 1.15
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

10 tons for 6x21" torpedo's (mark 6's)
40 tons for future growth

Medusa class CL type A 1927 (converted from CA)
Medusa, Minotaur, Hydra, Chimera (all scrapped 1943, names used for new anti-air cruisers)


Medusa, Atlantis Heavy Cruiser laid down 1915 (Engine 1927)

Displacement:
7,270 t light; 7,495 t standard; 8,342 t normal; 9,020 t full load

Dimensions: Length overall / water x beam x draught
570.89 ft / 565.00 ft x 58.00 ft x 16.50 ft (normal load)
174.01 m / 172.21 m x 17.68 m x 5.03 m

Armament:
4 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1915 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
2 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1915 Model
Breech loading guns in deck mounts with hoists
on side, evenly spread
8 - 3.00" / 76.2 mm guns (4x2 guns), 13.50lbs / 6.12kg shells, 1915 Model
Anti-aircraft guns in deck mounts with hoists
on side, all amidships
6 - 1.57" / 40 mm guns (3x2 guns), 1.93lbs / 0.88kg shells, 1915 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
12 - 1.00" / 25.4 mm guns (4x3 guns), 0.50lbs / 0.23kg shells, 1915 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 625 lbs / 283 kg
Shells per gun, main battery: 150
12 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 380.00 ft / 115.82 m 10.00 ft / 3.05 m
Ends: 1.00" / 25 mm 80.00 ft / 24.38 m 0.00 ft / 0.00 m
105.00 ft / 32.00 m Unarmoured ends
Upper: 1.00" / 25 mm 300.00 ft / 91.44 m 0.00 ft / 0.00 m
Main Belt covers 103 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - -
2nd: 1.00" / 25 mm - -

- Armour deck: 1.25" / 32 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 60,899 shp / 45,430 Kw = 30.00 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 1,524 tons

Complement:
436 - 567

Cost:
£0.857 million / $3.428 million

Distribution of weights at normal displacement:
Armament: 78 tons, 0.9 %
Armour: 1,043 tons, 12.5 %
- Belts: 474 tons, 5.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 19 tons, 0.2 %
- Armour Deck: 524 tons, 6.3 %
- Conning Tower: 27 tons, 0.3 %
Machinery: 1,922 tons, 23.0 %
Hull, fittings & equipment: 4,151 tons, 49.8 %
Fuel, ammunition & stores: 1,072 tons, 12.9 %
Miscellaneous weights: 75 tons, 0.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
12,170 lbs / 5,520 Kg = 146.3 x 5.5 " / 140 mm shells or 1.8 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 3.0 ft / 0.9 m
Roll period: 14.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.17
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak
Block coefficient: 0.540
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 23.77 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.00 ft / 6.71 m
- Forecastle (20 %): 20.70 ft / 6.31 m (20.20 ft / 6.16 m aft of break)
- Mid (55 %): 20.20 ft / 6.16 m (11.20 ft / 3.41 m aft of break)
- Quarterdeck (15 %): 11.20 ft / 3.41 m
- Stern: 11.20 ft / 3.41 m
- Average freeboard: 16.35 ft / 4.98 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83.7 %
- Above water (accommodation/working, high = better): 118.8 %
Waterplane Area: 22,657 Square feet or 2,105 Square metres
Displacement factor (Displacement / loading): 149 %
Structure weight / hull surface area: 125 lbs/sq ft or 608 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.46
- Longitudinal: 1.40
- Overall: 1.42
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

25 tons for one aircraft
25 tons for one catapult and one crane
21 tons for 12x21" torpedo's (mark 7's)
4 tons for future growth


Medusa class CA 1915

Medusa, Minotaur, Hydra, Chimera
+2 cancelled



Medusa and Minotaur converted to CL's in 1927, Hydra and Chimera expected to follow suit.

Medusa, Atlantis Heavy Cruiser laid down 1915

Displacement:
7,200 t light; 7,503 t standard; 8,443 t normal; 9,196 t full load

Dimensions: Length overall / water x beam x draught
569.46 ft / 565.00 ft x 58.00 ft x 16.70 ft (normal load)
173.57 m / 172.21 m x 17.68 m x 5.09 m

Armament:
5 - 7.50" / 191 mm guns in single mounts, 210.94lbs / 95.68kg shells, 1915 Model
Breech loading guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
2 - 7.50" / 191 mm guns in single mounts, 210.94lbs / 95.68kg shells, 1915 Model
Breech loading guns in deck mounts
on side, evenly spread
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1915 Model
Quick firing guns in deck mounts
on side, all amidships
8 - 1.00" / 25.4 mm guns (4x2 guns), 0.50lbs / 0.23kg shells, 1915 Model
Quick firing guns in deck mounts
on side, evenly spread
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1915 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 1,535 lbs / 696 kg
Shells per gun, main battery: 150
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 380.00 ft / 115.82 m 10.00 ft / 3.05 m
Ends: 1.00" / 25 mm 80.00 ft / 24.38 m 0.00 ft / 0.00 m
105.00 ft / 32.00 m Unarmoured ends
Upper: 1.00" / 25 mm 300.00 ft / 91.44 m 0.00 ft / 0.00 m
Main Belt covers 103 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - -

- Armour deck: 1.25" / 32 mm, Conning tower: 3.00" / 76 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 57,330 shp / 42,768 Kw = 29.50 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 1,693 tons

Complement:
439 - 572

Cost:
£1.043 million / $4.173 million

Distribution of weights at normal displacement:
Armament: 192 tons, 2.3 %
Armour: 1,048 tons, 12.4 %
- Belts: 474 tons, 5.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 23 tons, 0.3 %
- Armour Deck: 524 tons, 6.2 %
- Conning Tower: 27 tons, 0.3 %
Machinery: 2,172 tons, 25.7 %
Hull, fittings & equipment: 3,739 tons, 44.3 %
Fuel, ammunition & stores: 1,244 tons, 14.7 %
Miscellaneous weights: 50 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10,029 lbs / 4,549 Kg = 47.5 x 7.5 " / 191 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 3.3 ft / 1.0 m
Roll period: 13.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.34
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.540
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 23.77 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 67
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (55 %): 20.00 ft / 6.10 m (11.00 ft / 3.35 m aft of break)
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 16.03 ft / 4.89 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 102.0 %
- Above water (accommodation/working, high = better): 136.1 %
Waterplane Area: 22,657 Square feet or 2,105 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 112 lbs/sq ft or 549 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.24
- Longitudinal: 1.21
- Overall: 1.21
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

10 tons for 6x21" torpedo's (mark 4's)
40 tons for future growth

Active class CL 1922
Sold to Colombia in May 1940

*current refit*
Forward superstructure remodeled , new main armament of 5.5" guns to conform with CL standards, new 3" and 1" twin mounts added, new directors added, catapult added amidships and twin 21' torpedo mounts replaced with triples.



CL Active, Atlantis cruiser laid down 1916

Displacement:
7,553 t light; 7,774 t standard; 8,516 t normal; 9,074 t full load
Loading submergence 616 tons/feet

Dimensions:
565.00 ft x 58.00 ft x 17.00 ft (normal load)
172.21 m x 17.68 m x 5.18 m

Armament:
6 - 5.50" / 140 mm guns
8 - 3.00" / 76 mm AA guns
8 - 1.00" / 25 mm guns
Weight of broadside 611 lbs / 277 kg
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
Belt 3.94" / 100 mm, end belts 1.57" / 40 mm
Belts cover 120 % of normal area
Main gun shields 1.57" / 40 mm
Armour deck 1.57" / 40 mm, Conning tower 3.94" / 100 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 70,234 shp / 52,395 Kw = 31.00 kts
Range 8,000nm at 12.00 kts

Complement:
443 - 576

Cost:
£1.137 million / $4.548 million

Distribution of weights at normal displacement:
Armament: 76 tons, 0.9 %
Armour: 1,460 tons, 17.1 %
Belts: 778 tons, 9.1 %, Armament: 20 tons, 0.2 %, Armour Deck: 626 tons, 7.4 %
Conning Tower: 35 tons, 0.4 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 2,617 tons, 30.7 %
Hull, fittings & equipment: 3,350 tons, 39.3 %
Fuel, ammunition & stores: 963 tons, 11.3 %
Miscellaneous weights: 50 tons, 0.6 %

Metacentric height 3.4

Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.26
Shellfire needed to sink: 10,121 lbs / 4,591 Kg = 121.7 x 5.5 " / 140 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1.4
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.09
Relative quality as seaboat: 1.19

Hull form characteristics:
Block coefficient: 0.535
Sharpness coefficient: 0.35
Hull speed coefficient 'M': 8.46
'Natural speed' for length: 23.77 kts
Power going to wave formation at top speed: 57 %
Trim: 59
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 107.6 %
Relative accommodation and working space: 161.9 %
(Average = 100%)
Displacement factor: 116 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.07
(Structure weight / hull surface area: 96 lbs / square foot or 470 Kg / square metre)
Relative longitudinal hull strength: 1.34
(for 20.00 ft / 6.10 m average freeboard, freeboard adjustment 5.34 ft)
Relative composite hull strength: 1.10

10 tons for 6x21" torpedo's (mark 6's)
40 tons for future growth

Caracus (improved Eridanus) class CL's 1921

Caracus, Valencia, Ascanius, Maracaibo


These ships are relegated to training and are likely to be replaced in part by the next class of light cruisers (which will also replace the Pegasus class)

Caracus, Atlantis Light cruiser laid down 1921

Displacement:
7,032 t light; 7,247 t standard; 7,713 t normal; 8,085 t full load

Dimensions: Length overall / water x beam x draught
570.89 ft / 565.00 ft x 56.00 ft x 18.00 ft (normal load)
174.01 m / 172.21 m x 17.07 m x 5.49 m

Armament:
5 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1921 Model
Breech loading guns in deck mounts
on centreline ends, majority forward, 1 raised mount
2 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1921 Model
Breech loading guns in deck mounts
on side, all amidships
6 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1921 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
12 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1921 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 669 lbs / 304 kg
Shells per gun, main battery: 150
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 420.00 ft / 128.02 m 12.00 ft / 3.66 m
Ends: 1.57" / 40 mm 145.00 ft / 44.20 m 8.00 ft / 2.44 m
Upper: 0.78" / 20 mm 200.00 ft / 60.96 m 0.00 ft / 0.00 m
Main Belt covers 114 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -

- Armour deck: 1.18" / 30 mm, Conning tower: 5.90" / 150 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 72,298 shp / 53,934 Kw = 32.00 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 838 tons

Complement:
410 - 534

Cost:
£1.693 million / $6.770 million

Distribution of weights at normal displacement:
Armament: 84 tons, 1.1 %
Armour: 1,238 tons, 16.0 %
- Belts: 714 tons, 9.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 25 tons, 0.3 %
- Armour Deck: 450 tons, 5.8 %
- Conning Tower: 50 tons, 0.6 %
Machinery: 2,490 tons, 32.3 %
Hull, fittings & equipment: 3,171 tons, 41.1 %
Fuel, ammunition & stores: 681 tons, 8.8 %
Miscellaneous weights: 50 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,582 lbs / 3,439 Kg = 91.1 x 5.5 " / 140 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 3.1 ft / 1.0 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 1.03

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.474
Length to Beam Ratio: 10.09 : 1
'Natural speed' for length: 23.77 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 68
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.00 ft / 6.71 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (65 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 16.66 ft / 5.08 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 114.1 %
- Above water (accommodation/working, high = better): 133.7 %
Waterplane Area: 20,597 Square feet or 1,914 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 99 lbs/sq ft or 484 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.17
- Longitudinal: 1.28
- Overall: 1.18
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

14 tons for 8x21" torpedo's (mark 6's)
36 tons for future growth

Eridanus class CL's 1917

Eridanus, Duecalion, Ilissus, Phelleus, Lycabettus, Thetis (all scrapped in 1942)


Eridanus, Atlantis Light cruiser laid down 1917

Displacement:
7,015 t light; 7,227 t standard; 7,713 t normal; 8,102 t full load

Dimensions: Length overall / water x beam x draught
568.88 ft / 565.00 ft x 56.00 ft x 18.00 ft (normal load)
173.39 m / 172.21 m x 17.07 m x 5.49 m

Armament:
5 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1917 Model
Breech loading guns in deck mounts
on centreline ends, majority forward, 1 raised mount
2 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1917 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1917 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1917 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 640 lbs / 290 kg
Shells per gun, main battery: 150
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 470.00 ft / 143.26 m 12.00 ft / 3.66 m
Ends: 1.57" / 40 mm 95.00 ft / 28.96 m 8.00 ft / 2.44 m
Upper: 0.78" / 20 mm 200.00 ft / 60.96 m 0.00 ft / 0.00 m
Main Belt covers 128 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -

- Armour deck: 1.18" / 30 mm, Conning tower: 5.90" / 150 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 76,986 shp / 57,432 Kw = 32.50 kts
Range 5,600nm at 12.00 kts
Bunker at max displacement = 876 tons

Complement:
410 - 534

Cost:
£1.287 million / $5.148 million

Distribution of weights at normal displacement:
Armament: 80 tons, 1.0 %
Armour: 1,279 tons, 16.6 %
- Belts: 755 tons, 9.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 25 tons, 0.3 %
- Armour Deck: 450 tons, 5.8 %
- Conning Tower: 50 tons, 0.6 %
Machinery: 2,822 tons, 36.6 %
Hull, fittings & equipment: 2,783 tons, 36.1 %
Fuel, ammunition & stores: 698 tons, 9.1 %
Miscellaneous weights: 50 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,182 lbs / 2,804 Kg = 74.3 x 5.5 " / 140 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.29
Metacentric height 3.3 ft / 1.0 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.474
Length to Beam Ratio: 10.09 : 1
'Natural speed' for length: 23.77 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.00 ft / 6.71 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (65 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 16.66 ft / 5.08 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 127.5 %
- Above water (accommodation/working, high = better): 133.7 %
Waterplane Area: 20,597 Square feet or 1,914 Square metres
Displacement factor (Displacement / loading): 101 %
Structure weight / hull surface area: 87 lbs/sq ft or 424 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 1.13
- Overall: 1.04
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

10 tons for 8x21" torpedo's (mark 4's)
40 tons for future growth

Warrior class CL's 1916

Warrior (sold to Chile), Triumph (scrapped), Vindex (sold to Chile), Concord (scrapped), Intrepid (scrapped), Lively (scrapped),


Warrior, Atlantis Light cruiser laid down 1916

Displacement:
6,984 t light; 7,195 t standard; 7,700 t normal; 8,104 t full load

Dimensions: Length overall / water x beam x draught
578.88 ft / 575.00 ft x 56.00 ft x 18.00 ft (normal load)
176.44 m / 175.26 m x 17.07 m x 5.49 m

Armament:
5 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1916 Model
Breech loading guns in deck mounts
on centreline ends, majority forward, 1 raised mount
2 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1916 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1916 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1916 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 640 lbs / 290 kg
Shells per gun, main battery: 150
8 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 480.00 ft / 146.30 m 12.00 ft / 3.66 m
Ends: 1.57" / 40 mm 95.00 ft / 28.96 m 8.00 ft / 2.44 m
Upper: 0.78" / 20 mm 200.00 ft / 60.96 m 0.00 ft / 0.00 m
Main Belt covers 128 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -

- Armour deck: 1.18" / 30 mm, Conning tower: 5.90" / 150 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 75,814 shp / 56,557 Kw = 32.50 kts
Range 5,600nm at 12.00 kts
Bunker at max displacement = 909 tons

Complement:
410 - 534

Cost:
£1.157 million / $4.628 million

Distribution of weights at normal displacement:
Armament: 80 tons, 1.0 %
Armour: 1,298 tons, 16.9 %
- Belts: 769 tons, 10.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 25 tons, 0.3 %
- Armour Deck: 454 tons, 5.9 %
- Conning Tower: 50 tons, 0.6 %
Machinery: 2,825 tons, 36.7 %
Hull, fittings & equipment: 2,731 tons, 35.5 %
Fuel, ammunition & stores: 717 tons, 9.3 %
Miscellaneous weights: 50 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,265 lbs / 2,842 Kg = 75.3 x 5.5 " / 140 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.33
Metacentric height 3.5 ft / 1.1 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.465
Length to Beam Ratio: 10.27 : 1
'Natural speed' for length: 23.98 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 66
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.00 ft / 6.71 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (65 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 16.66 ft / 5.08 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 127.8 %
- Above water (accommodation/working, high = better): 135.5 %
Waterplane Area: 20,799 Square feet or 1,932 Square metres
Displacement factor (Displacement / loading): 101 %
Structure weight / hull surface area: 84 lbs/sq ft or 412 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.08
- Overall: 1.01
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

10 tons for 8x21" torpedo's (mark 4's)
40 tons for future growth

Champion class

Champion, reconstructed in 1933 following engagement with Pirate ship SS Intrepida (later determined to be decoy vessel) sold to Colombia in 1942
Maturia, damaged in 1932 by Pirate ship SS Intrepida and scuttled



As refited...

Champion, Atlantis Light Cruiser laid down 1915, (Engine 1933)

Displacement:
4,775 t light; 5,018 t standard; 5,228 t normal; 5,395 t full load

Dimensions: Length overall / water x beam x draught
485.10 ft / 476.00 ft x 52.00 ft x 16.00 ft (normal load)
147.86 m / 145.08 m x 15.85 m x 4.88 m

Armament:
8 - 5.10" / 130 mm guns (5 mounts), 66.33lbs / 30.09kg shells, 1933 Model
Dual purpose guns in deck mounts with hoists
on centreline, evenly spread, 1 raised mount
4 - 3.95" / 100 mm guns in single mounts, 30.81lbs / 13.98kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, all amidships
6 - 1.57" / 39.9 mm guns (3x2 guns), 1.93lbs / 0.88kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
12 - 0.79" / 20.0 mm guns (3x4 guns), 0.24lbs / 0.11kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.50" / 12.7 mm guns (4x2 guns), 0.06lbs / 0.03kg shells, 1933 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 669 lbs / 303 kg
Shells per gun, main battery: 350
6 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 390.00 ft / 118.87 m 12.00 ft / 3.66 m
Ends: 1.58" / 40 mm 86.00 ft / 26.21 m 8.00 ft / 2.44 m
Main Belt covers 126 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.58" / 40 mm 0.79" / 20 mm 1.17" / 30 mm
2nd: 1.00" / 25 mm - -
3rd: 0.79" / 20 mm - -
4th: 0.60" / 15 mm - -

- Armour deck: 1.17" / 30 mm, Conning tower: 1.58" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 50,000 shp / 37,300 Kw = 30.40 kts
Range 5,500nm at 10.00 kts
Bunker at max displacement = 376 tons

Complement:
306 - 399

Cost:
£0.642 million / $2.568 million

Distribution of weights at normal displacement:
Armament: 84 tons, 1.6 %
Armour: 1,030 tons, 19.7 %
- Belts: 634 tons, 12.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 41 tons, 0.8 %
- Armour Deck: 345 tons, 6.6 %
- Conning Tower: 10 tons, 0.2 %
Machinery: 1,457 tons, 27.9 %
Hull, fittings & equipment: 2,105 tons, 40.3 %
Fuel, ammunition & stores: 452 tons, 8.6 %
Miscellaneous weights: 100 tons, 1.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5,883 lbs / 2,669 Kg = 88.7 x 5.1 " / 130 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 2.4 ft / 0.7 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.462
Length to Beam Ratio: 9.15 : 1
'Natural speed' for length: 21.82 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (60 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 16.40 ft / 5.00 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 106.8 %
- Above water (accommodation/working, high = better): 133.6 %
Waterplane Area: 15,947 Square feet or 1,482 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 84 lbs/sq ft or 411 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.48
- Overall: 1.04
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

40 tons for improved gun directors for main and AA weapons
10 tons for 6x21" torpedo's (mark 9's)
10 tons for air conditioning systems
40 tons for future growth



Champion, Atlantis Light Cruiser laid down 1915

Displacement:
4,833 t light; 4,982 t standard; 5,228 t normal; 5,424 t full load

Dimensions: Length overall / water x beam x draught
479.53 ft / 476.00 ft x 52.00 ft x 16.00 ft (normal load)
146.16 m / 145.08 m x 15.85 m x 4.88 m

Armament:
5 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1915 Model
Breech loading guns in deck mounts
on centreline, evenly spread
1 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1915 Model
Anti-aircraft gun in deck mount
on centreline
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1915 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
6 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1915 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 505 lbs / 229 kg
Shells per gun, main battery: 150
6 - 21.0" / 533.4 mm above water torpedoes, 2 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 390.00 ft / 118.87 m 12.00 ft / 3.66 m
Ends: 1.57" / 40 mm 86.00 ft / 26.21 m 8.00 ft / 2.44 m
Main Belt covers 126 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -

- Armour deck: 0.78" / 20 mm, Conning tower: 6.10" / 155 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 47,396 shp / 35,357 Kw = 30.00 kts
Range 4,800nm at 10.00 kts
Bunker at max displacement = 442 tons

Complement:
306 - 399

Cost:
£0.689 million / $2.755 million

Distribution of weights at normal displacement:
Armament: 63 tons, 1.2 %
Armour: 928 tons, 17.8 %
- Belts: 634 tons, 12.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 25 tons, 0.5 %
- Armour Deck: 230 tons, 4.4 %
- Conning Tower: 40 tons, 0.8 %
Machinery: 1,795 tons, 34.3 %
Hull, fittings & equipment: 1,996 tons, 38.2 %
Fuel, ammunition & stores: 395 tons, 7.5 %
Miscellaneous weights: 50 tons, 1.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,456 lbs / 2,021 Kg = 53.6 x 5.5 " / 140 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.27
Metacentric height 2.9 ft / 0.9 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 1.06

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.462
Length to Beam Ratio: 9.15 : 1
'Natural speed' for length: 21.82 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 66
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.00 ft / 6.10 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (60 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 16.00 ft / 4.88 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 126.2 %
- Above water (accommodation/working, high = better): 133.6 %
Waterplane Area: 15,947 Square feet or 1,482 Square metres
Displacement factor (Displacement / loading): 103 %
Structure weight / hull surface area: 80 lbs/sq ft or 393 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 1.43
- Overall: 1.07
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

10 tons for 6x21" torpedo's (mark 4's)
40 tons for future growth

Nereus class CL's 1910, all scrapped

Nereus, Parnassus, Tithonus


Nereus, Atlantis Light Cruiser laid down 1910

Displacement:
4,656 t light; 4,811 t standard; 5,196 t normal; 5,504 t full load

Dimensions: Length overall / water x beam x draught
479.70 ft / 476.00 ft x 52.00 ft x 15.50 ft (normal load)
146.21 m / 145.08 m x 15.85 m x 4.72 m

Armament:
2 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1910 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
8 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1910 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1910 Model
Quick firing guns in deck mounts
on side, evenly spread
10 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1910 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 531 lbs / 241 kg
Shells per gun, main battery: 150
4 - 18.0" / 457.2 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 355.00 ft / 108.20 m 12.00 ft / 3.66 m
Ends: 1.57" / 40 mm 121.00 ft / 36.88 m 8.00 ft / 2.44 m
Upper: 1.18" / 30 mm 160.00 ft / 48.77 m 8.00 ft / 2.44 m
Main Belt covers 115 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -
2nd: 0.79" / 20 mm - -

- Armour deck: 1.18" / 30 mm, Conning tower: 3.15" / 80 mm

Machinery:
Coal fired boilers, steam turbines,
Direct drive, 4 shafts, 35,959 shp / 26,825 Kw = 28.00 kts
Range 4,500nm at 10.00 kts
Bunker at max displacement = 693 tons (100% coal)

Complement:
305 - 397

Cost:
£0.448 million / $1.790 million

Distribution of weights at normal displacement:
Armament: 66 tons, 1.3 %
Armour: 1,075 tons, 20.7 %
- Belts: 678 tons, 13.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 25 tons, 0.5 %
- Armour Deck: 352 tons, 6.8 %
- Conning Tower: 20 tons, 0.4 %
Machinery: 1,634 tons, 31.5 %
Hull, fittings & equipment: 1,850 tons, 35.6 %
Fuel, ammunition & stores: 540 tons, 10.4 %
Miscellaneous weights: 30 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,013 lbs / 2,727 Kg = 55.7 x 6.0 " / 152 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.39
Metacentric height 3.3 ft / 1.0 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 1.32

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.474
Length to Beam Ratio: 9.15 : 1
'Natural speed' for length: 21.82 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 53
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (70 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 17.08 ft / 5.21 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 112.9 %
- Above water (accommodation/working, high = better): 163.5 %
Waterplane Area: 16,113 Square feet or 1,497 Square metres
Displacement factor (Displacement / loading): 106 %
Structure weight / hull surface area: 73 lbs/sq ft or 357 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.37
- Overall: 0.98
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Callosus class, all Scrapped


Callosus, Iphicles, Orcus, Vernus, Cassius, Erastius

Atlantian Scout Cruiser laid down 1909

Displacement:
4,168 t light; 4,292 t standard; 4,641 t normal; 4,921 t full load

Dimensions: Length overall / water x beam x draught
447.00 ft / 447.00 ft x 50.00 ft x 15.80 ft (normal load)
136.25 m / 136.25 m x 15.24 m x 4.82 m

Armament:
8 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1909 Model
Breech loading guns in deck mounts
on side, evenly spread
1 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1909 Model
Quick firing gun in deck mount
on centreline
4 - 3.00" / 76.2 mm guns (2x2 guns), 13.50lbs / 6.12kg shells, 1919 Model
Quick firing guns in deck mounts
on side, evenly spread
10 - 0.78" / 19.8 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1909 Model
Quick firing guns in deck mounts
on side, evenly spread
Weight of broadside 344 lbs / 156 kg
Shells per gun, main battery: 150
4 - 18.0" / 457.2 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 4.14" / 105 mm

Machinery:
Coal fired boilers, steam turbines,
Direct drive, 2 shafts, 27,450 shp / 20,478 Kw = 26.50 kts
Range 4,200nm at 10.00 kts
Bunker at max displacement = 629 tons (100% coal)

Complement:
280 - 365

Cost:
£0.374 million / $1.497 million

Distribution of weights at normal displacement:
Armament: 43 tons, 0.9 %
Armour: 469 tons, 10.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 27 tons, 0.6 %
- Armour Deck: 418 tons, 9.0 %
- Conning Tower: 25 tons, 0.5 %
Machinery: 1,373 tons, 29.6 %
Hull, fittings & equipment: 2,233 tons, 48.1 %
Fuel, ammunition & stores: 473 tons, 10.2 %
Miscellaneous weights: 50 tons, 1.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5,437 lbs / 2,466 Kg = 169.9 x 4.0 " / 102 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.33
Metacentric height 2.9 ft / 0.9 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 1.23

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.460
Length to Beam Ratio: 8.94 : 1
'Natural speed' for length: 21.14 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 57
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.00 ft / 6.10 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (45 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 14.50 ft / 4.42 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 104.7 %
- Above water (accommodation/working, high = better): 123.1 %
Waterplane Area: 14,375 Square feet or 1,336 Square metres
Displacement factor (Displacement / loading): 129 %
Structure weight / hull surface area: 101 lbs/sq ft or 492 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.43
- Longitudinal: 1.88
- Overall: 1.47
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Brencis class (all scrapped)
Brencis, Magnus, Attis, Aleron

Brencis, Atlantis Scout Cruiser laid down 1908

Displacement:
4,043 t light; 4,171 t standard; 4,533 t normal; 4,822 t full load

Dimensions: Length overall / water x beam x draught
445.00 ft / 445.00 ft x 50.00 ft x 15.50 ft (normal load)
135.64 m / 135.64 m x 15.24 m x 4.72 m

Armament:
10 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1908 Model
Breech loading guns in deck mounts
on side, evenly spread
1 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1908 Model
Quick firing gun in deck mount
on side amidships
4 - 3.00" / 76.2 mm guns (2x2 guns), 13.50lbs / 6.12kg shells, 1908 Model
Quick firing guns in deck mounts
on side, evenly spread
10 - 0.78" / 19.8 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1908 Model
Quick firing guns in deck mounts
on side, evenly spread
Weight of broadside 408 lbs / 185 kg
Shells per gun, main battery: 150
4 - 18.0" / 457.2 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -

- Armour deck: 1.57" / 40 mm, Conning tower: 4.14" / 105 mm

Machinery:
Coal fired boilers, steam turbines,
Direct drive, 2 shafts, 21,546 shp / 16,073 Kw = 25.00 kts
Range 4,200nm at 10.00 kts
Bunker at max displacement = 652 tons (100% coal)

Complement:
276 - 359

Cost:
£0.352 million / $1.408 million

Distribution of weights at normal displacement:
Armament: 51 tons, 1.1 %
Armour: 474 tons, 10.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 34 tons, 0.7 %
- Armour Deck: 416 tons, 9.2 %
- Conning Tower: 24 tons, 0.5 %
Machinery: 1,197 tons, 26.4 %
Hull, fittings & equipment: 2,271 tons, 50.1 %
Fuel, ammunition & stores: 489 tons, 10.8 %
Miscellaneous weights: 50 tons, 1.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,216 lbs / 2,819 Kg = 194.2 x 4.0 " / 102 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.37
Metacentric height 3.1 ft / 0.9 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.39

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.460
Length to Beam Ratio: 8.90 : 1
'Natural speed' for length: 21.10 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.00 ft / 6.10 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (45 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 14.50 ft / 4.42 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96.1 %
- Above water (accommodation/working, high = better): 124.3 %
Waterplane Area: 14,311 Square feet or 1,330 Square metres
Displacement factor (Displacement / loading): 136 %
Structure weight / hull surface area: 103 lbs/sq ft or 505 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.47
- Longitudinal: 1.94
- Overall: 1.52
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily