After a while on the Atkin's Diet................
A little weaker, but back to the size I initially wanted!
D Class (C), Denmark Fleet submarine laid down 1924
Displacement:
1,187 t light; 1,218 t standard; 1,429 t normal; 1,591 t full load
Loading submergence 112 tons/feet
Dimensions:
250.00 ft x 25.00 ft x 16.00 ft (normal load)
76.20 m x 7.62 m x 4.88 m
Armament:
1 - 3.94" / 100 mm guns
2 - 0.79" / 20 mm AA guns
2 - 0.49" / 13 mm guns
Weight of broadside 31 lbs / 14 kg
8 - 21.0" / 533.4 mm submerged torpedo tubes
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 5,513 shp / 4,113 Kw = 20.00 kts
Range 8,000nm at 12.00 kts
Complement:
116 - 151
Cost:
£0.217 million / $0.868 million
Distribution of weights at normal displacement:
Armament: 4 tons, 0.3 %
Machinery: 182 tons, 12.7 %
Hull, fittings & equipment: 701 tons, 49.1 %
Fuel, ammunition & stores: 242 tons, 16.9 %
Miscellaneous weights: 300 tons, 21.0 %
Metacentric height 0.6
Remarks:
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.01
Shellfire needed to sink: 343 lbs / 156 Kg = 11.2 x 3.9 " / 100 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.1
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 1 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.00
Relative quality as seaboat: 0.00
Hull form characteristics:
Block coefficient: 0.500
Sharpness coefficient: 0.33
Hull speed coefficient 'M': 6.78
'Natural speed' for length: 15.81 kts
Power going to wave formation at top speed: 53 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 145.1 %
Relative accommodation and working space: 0.6 %
(Average = 100%)
Displacement factor: 206 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 3.19
(Structure weight / hull surface area: 113 lbs / square foot or 552 Kg / square metre)
Relative longitudinal hull strength: 1.72
(for 0.10 ft / 0.03 m average freeboard, freeboard adjustment -10.16 ft)
Relative composite hull strength: 2.00
Operating Depth = 200'
Emergency Depth = 320'
Crush Depth = 500'