WesWorld

Atlantis plans on refiting the remaining two Medusa class cruisers to a slightly different configuration to the first two and the CL Active.



Hydra, Atlantean Light Cruiser laid down 1915 (Engine 1929)

Displacement:
7,220 t light; 7,512 t standard; 8,342 t normal; 9,007 t full load

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

Armament:
8 - 6.00" / 152 mm guns (4x2 guns), 110.23lbs / 50.00kg shells, 1929 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 3.00" / 76.2 mm guns (6x2 guns), 13.50lbs / 6.12kg shells, 1926 Model
Dual purpose guns in deck mounts
on side, evenly spread
4 - 1.57" / 39.9 mm guns (2x2 guns), 1.93lbs / 0.88kg shells, 1929 Model
Anti-aircraft guns in deck mounts
on side, all amidships
2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1929 Model
Anti-aircraft guns in deck mount
on centreline forward
12 - 0.79" / 20.1 mm guns (4x3 guns), 0.25lbs / 0.11kg shells, 1929 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 1,058 lbs / 480 kg
Shells per gun, main battery: 200
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: Unarmoured
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: 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, 60,899 shp / 45,430 Kw = 30.00 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 1,495 tons

Complement:
436 - 567

Cost:
£0.907 million / $3.629 million

Distribution of weights at normal displacement:
Armament: 130 tons, 1.6 %
Armour: 1,087 tons, 13.0 %
- Belts: 474 tons, 5.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 63 tons, 0.8 %
- Armour Deck: 524 tons, 6.3 %
- Conning Tower: 27 tons, 0.3 %
Machinery: 1,870 tons, 22.4 %
Hull, fittings & equipment: 4,052 tons, 48.6 %
Fuel, ammunition & stores: 1,122 tons, 13.5 %
Miscellaneous weights: 80 tons, 1.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
11,641 lbs / 5,280 Kg = 107.8 x 6.0 " / 152 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 2.9 ft / 0.9 m
Roll period: 14.2 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: 0.540
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): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.00 ft / 7.01 m
- Forecastle (20 %): 20.20 ft / 6.16 m
- 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: 16.37 ft / 4.99 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86.9 %
- Above water (accommodation/working, high = better): 118.8 %
Waterplane Area: 22,657 Square feet or 2,105 Square metres
Displacement factor (Displacement / loading): 140 %
Structure weight / hull surface area: 122 lbs/sq ft or 593 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.37
- Longitudinal: 1.34
- Overall: 1.35
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

Looks good, probably a little bit slow. I like the drawing a lot. Just one question: Have you checked of the TTs can train and isn´t the plane a little bit small?

Which modifications are done to her?

Quoted

Upper: 1.00" / 25 mm 300.00 ft / 91.44 m 0.00 ft / 0.00 m

Not a very useful belt, with a height of 0.00 feet.

The plane may be a wee bit small, my last plane seemed huge so thats an area I need to work on, either way one should fit. The torpedo's should be able to train I think .

As for modifications she basically follows the refits of Medusa, Minotaur and Active, with new boilers, increased range and considerably better AA capability's.
She also gains superstructure modifications and or course the scout plane with catipult. Her bow is slightly reshaped.

The main difference between Hydra and her sisters Medusa and Minotaur is the main armament decreasing from 7.5" to 6" rather than to the 5.5" of the Active/Medusa class ships.

These modifications will likely be made on the Pioneer class as well which Active originally belonged to way back before she was converted to a CVX while building and then a CL in IIRC 1923.

Quoted

Originally posted by Hrolf Hakonson

Quoted

Upper: 1.00" / 25 mm 300.00 ft / 91.44 m 0.00 ft / 0.00 m

Not a very useful belt, with a height of 0.00 feet.

Ack!! I thought I removed that end belt! This is why I posted the design here so you guys could catch what I missed, you know the obvious stuff? Seems I FUBAR'ed the upper belt trying to remove the ends...

Fixed (unless I mounted those type 2 phasers again for Swampy's enjoyment)

Hydra, Atlantean Light Cruiser laid down 1915 (Engine 1929)

Displacement:
7,220 t light; 7,512 t standard; 8,342 t normal; 9,007 t full load

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

Armament:
8 - 6.00" / 152 mm guns (4x2 guns), 110.23lbs / 50.00kg shells, 1929 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 3.00" / 76.2 mm guns (6x2 guns), 13.50lbs / 6.12kg shells, 1926 Model
Dual purpose guns in deck mounts
on side, evenly spread
4 - 1.57" / 39.9 mm guns (2x2 guns), 1.93lbs / 0.88kg shells, 1929 Model
Anti-aircraft guns in deck mounts
on side, all amidships
2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1929 Model
Anti-aircraft guns in deck mount
on centreline forward
12 - 0.79" / 20.1 mm guns (4x3 guns), 0.25lbs / 0.11kg shells, 1929 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 1,058 lbs / 480 kg
Shells per gun, main battery: 200
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: Unarmoured
Upper: 1.00" / 25 mm 300.00 ft / 91.44 m 4.92 ft / 1.50 m
Main Belt covers 103 % 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, 60,899 shp / 45,430 Kw = 30.00 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 1,495 tons

Complement:
436 - 567

Cost:
£0.907 million / $3.629 million

Distribution of weights at normal displacement:
Armament: 130 tons, 1.6 %
Armour: 1,151 tons, 13.8 %
- Belts: 538 tons, 6.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 63 tons, 0.8 %
- Armour Deck: 524 tons, 6.3 %
- Conning Tower: 27 tons, 0.3 %
Machinery: 1,870 tons, 22.4 %
Hull, fittings & equipment: 3,989 tons, 47.8 %
Fuel, ammunition & stores: 1,122 tons, 13.5 %
Miscellaneous weights: 80 tons, 1.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
11,630 lbs / 5,275 Kg = 107.7 x 6.0 " / 152 mm shells or 1.7 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 2.9 ft / 0.9 m
Roll period: 14.2 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: 0.540
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): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.00 ft / 7.01 m
- Forecastle (20 %): 20.20 ft / 6.16 m
- 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: 16.37 ft / 4.99 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86.9 %
- Above water (accommodation/working, high = better): 118.8 %
Waterplane Area: 22,657 Square feet or 2,105 Square metres
Displacement factor (Displacement / loading): 139 %
Structure weight / hull surface area: 120 lbs/sq ft or 584 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.35
- Longitudinal: 1.32
- Overall: 1.33
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