New atlantean ship building projects
Existing E-class design has been altered, four new ships to this improved design have been laid down.
E-1 class, Atlantean Escort laid down 1931/32
Displacement:
615 t light; 653 t standard; 920 t normal; 1,134 t full load
Dimensions: Length overall / water x beam x draught
230.36 ft / 225.00 ft x 30.00 ft x 9.00 ft (normal load)
70.21 m / 68.58 m x 9.14 m x 2.74 m
Armament:
4 - 3.95" / 100 mm guns (2x2 guns), 30.81lbs / 13.98kg shells, 1931 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
4 - 1.58" / 40.0 mm guns (3 mounts), 1.95lbs / 0.88kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
6 - 0.79" / 20 mm guns in single mounts, 0.25lbs / 0.11kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1931 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 133 lbs / 60 kg
Shells per gun, main battery: 250
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 1.00" / 25 mm -
2nd: 1.00" / 25 mm - -
- Conning tower: 1.57" / 40 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 4,950 shp / 3,693 Kw = 20.39 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 481 tons
Complement:
83 - 108
Cost:
£0.245 million / $0.981 million
Distribution of weights at normal displacement:
Armament: 17 tons, 1.8 %
Armour: 17 tons, 1.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 13 tons, 1.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.3 %
Machinery: 148 tons, 16.1 %
Hull, fittings & equipment: 394 tons, 42.8 %
Fuel, ammunition & stores: 305 tons, 33.2 %
Miscellaneous weights: 40 tons, 4.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,098 lbs / 951 Kg = 68.1 x 4.0 " / 100 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.32
Metacentric height 1.3 ft / 0.4 m
Roll period: 10.9 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.19
Seaboat quality (Average = 1.00): 1.86
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.530
Length to Beam Ratio: 7.50 : 1
'Natural speed' for length: 15.00 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 38
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: 20.00 ft / 6.10 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m (9.00 ft / 2.74 m aft of break)
- Quarterdeck (15 %): 9.00 ft / 2.74 m
- Stern: 9.00 ft / 2.74 m
- Average freeboard: 13.66 ft / 4.16 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72.6 %
- Above water (accommodation/working, high = better): 139.6 %
Waterplane Area: 4,624 Square feet or 430 Square metres
Displacement factor (Displacement / loading): 189 %
Structure weight / hull surface area: 44 lbs/sq ft or 215 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 5.49
- Overall: 1.08
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
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
20 tons for DC
10 tons for sonar
10 tons for future growth
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Preposed refit for 1919 P-class Patrol Boats
Refited version now with uniform DP armament of 3.95" DP mounts.
Refit also includes a remodeling of the bridge structure, a new verticle funnel and new 40mm, 20mm and 12.7mm weapons.
Basic mine sweeping gear has been removed and DC complement has been increased. Sonar has also been added.
The orriginal machinery is retained and refurbished.
They still retain their distinctive steped apearance forward and gently sloping deck
E-class (Now P-class) *now classed as escorts*
Atlantean Patrol vessels laid down 1919, refited 1932
Displacement:
435 t light; 460 t standard; 523 t normal; 573 t full load
Dimensions: Length overall / water x beam x draught
201.05 ft / 200.00 ft x 25.00 ft x 7.32 ft (normal load)
61.28 m / 60.96 m x 7.62 m x 2.23 m
Armament:
3 - 3.95" / 100 mm guns in single mounts, 30.81lbs / 13.98kg shells, 1932 Model
Dual purpose guns in deck mounts
on centreline ends, majority forward
2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1932 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 97 lbs / 44 kg
Shells per gun, main battery: 250
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 1 shaft, 2,153 shp / 1,606 Kw = 18.00 kts
Range 4,000nm at 12.00 kts
Bunker at max displacement = 113 tons
Complement:
54 - 71
Cost:
£0.079 million / $0.316 million
Distribution of weights at normal displacement:
Armament: 12 tons, 2.3 %
Machinery: 76 tons, 14.6 %
Hull, fittings & equipment: 317 tons, 60.6 %
Fuel, ammunition & stores: 87 tons, 16.7 %
Miscellaneous weights: 30 tons, 5.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
999 lbs / 453 Kg = 32.4 x 4.0 " / 100 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 0.8 ft / 0.2 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.24
Seaboat quality (Average = 1.00): 1.47
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.500
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 14.14 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 12.00 ft / 3.66 m
- Forecastle (20 %): 9.50 ft / 2.90 m
- Mid (50 %): 9.50 ft / 2.90 m
- Quarterdeck (15 %): 9.00 ft / 2.74 m
- Stern: 9.00 ft / 2.74 m
- Average freeboard: 9.54 ft / 2.91 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.6 %
- Above water (accommodation/working, high = better): 105.8 %
Waterplane Area: 3,202 Square feet or 297 Square metres
Displacement factor (Displacement / loading): 187 %
Structure weight / hull surface area: 56 lbs/sq ft or 276 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.46
- Longitudinal: 4.28
- Overall: 1.63
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
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XSS-1, Atlantean Midgit sub laid down 1932
Displacement:
54 t light; 55 t standard; 56 t normal; 56 t full load
Dimensions: Length overall / water x beam x draught
62.00 ft / 62.00 ft x 8.75 ft x 5.75 ft (normal load)
18.90 m / 18.90 m x 2.67 m x 1.75 m
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 19 shp / 14 Kw = 6.75 kts
Range 1,500nm at 5.00 kts
Bunker at max displacement = 2 tons
Complement:
9 - 13
Cost:
£0.009 million / $0.036 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 1 tons, 1.0 %
Hull, fittings & equipment: 39 tons, 70.2 %
Fuel, ammunition & stores: 2 tons, 3.7 %
Miscellaneous weights: 14 tons, 25.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
86 lbs / 39 Kg = 0.8 x 6 " / 152 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.1 ft / 0.0 m
Roll period: 10.2 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.00
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.625
Length to Beam Ratio: 7.09 : 1
'Natural speed' for length: 7.87 kts
Power going to wave formation at top speed: 39 %
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: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 32.1 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 399 Square feet or 37 Square metres
Displacement factor (Displacement / loading): 369 %
Structure weight / hull surface area: 65 lbs/sq ft or 318 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 5.49
- Longitudinal: 5.13
- Overall: 5.22
Hull space for machinery, storage, compartmentation is excellent
Operational depth:522 feet
Emergency depth: 835 feet
Crush depth: 1,305 feet
10 tons for ballast
4 tons for misc weight
------------------------------------------------------------------------
XSS-2, Atlantean Midgit sub laid down 1932
Displacement:
59 t light; 60 t standard; 61 t normal; 62 t full load
Dimensions: Length overall / water x beam x draught
72.00 ft / 72.00 ft x 8.75 ft x 5.50 ft (normal load)
21.95 m / 21.95 m x 2.67 m x 1.68 m
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 19 shp / 14 Kw = 6.75 kts
Range 1,500nm at 5.00 kts
Bunker at max displacement = 2 tons
Complement:
10 - 14
Cost:
£0.010 million / $0.039 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 1 tons, 0.9 %
Hull, fittings & equipment: 43 tons, 69.4 %
Fuel, ammunition & stores: 2 tons, 3.6 %
Miscellaneous weights: 16 tons, 26.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
94 lbs / 42 Kg = 0.9 x 6 " / 152 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.1 ft / 0.0 m
Roll period: 10.2 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.00
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.620
Length to Beam Ratio: 8.23 : 1
'Natural speed' for length: 8.49 kts
Power going to wave formation at top speed: 33 %
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: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 32.8 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 461 Square feet or 43 Square metres
Displacement factor (Displacement / loading): 358 %
Structure weight / hull surface area: 63 lbs/sq ft or 305 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 5.39
- Longitudinal: 3.44
- Overall: 3.85
Hull space for machinery, storage, compartmentation is excellent
Operational depth: 385 feet
Emergency depth: 616 feet
Crush Depth: 962 feet
10 tons for ballast
6 tons for misc weight