D Class, Denmark Fleet Submarine laid down 1925
K.D.M. UD1
K.D.M. UD2
K.D.M. UD3
K.D.M. UD4
K.D.M. UD5
K.D.M. UD6
K.D.M. UD7
K.D.M. UD8
Displacement:
974 t light; 1,002 t standard; 1,102 t normal; 1,177 t full load
Loading submergence 88 tons/feet
Dimensions:
250.00 ft x 32.00 ft x 20.00 ft (normal load)
76.20 m x 9.75 m x 6.10 m
Armament:
1 - 5.12" / 130 mm guns
4 - 0.79" / 20 mm AA guns
2 - 0.51" / 13 mm guns
Weight of broadside 68 lbs / 31 kg
8 - 21.0" / 533.4 mm submerged torpedo tubes
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 2,054 shp / 1,532 Kw = 16.00 kts
Range 6,000nm at 10.00 kts
Complement:
95 - 124
Cost:
£0.166 million / $0.662 million
Distribution of weights at normal displacement:
Armament: 9 tons, 0.8 %
Machinery: 67 tons, 6.1 %
Hull, fittings & equipment: 689 tons, 62.5 %
Fuel, ammunition & stores: 128 tons, 11.6 %
Miscellaneous weights: 210 tons, 19.1 %
Metacentric height 1.1
Remarks:
Hull space for machinery, storage & compartmentation is excellent
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: 1.09
Shellfire needed to sink: 709 lbs / 322 Kg = 10.6 x 5.1 " / 130 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.4
(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: 0.241
Sharpness coefficient: 0.25
Hull speed coefficient 'M': 7.40
'Natural speed' for length: 15.81 kts
Power going to wave formation at top speed: 30 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 82.0 %
Relative accommodation and working space: 0.6 %
(Average = 100%)
Displacement factor: 268 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 2.49
(Structure weight / hull surface area: 114 lbs / square foot or 555 Kg / square metre)
Relative longitudinal hull strength: 3.39
(for 0.10 ft / 0.03 m average freeboard, freeboard adjustment -9.64 ft)
Relative composite hull strength: 2.57
Diving Depth = 256'
Emergency Depth = 410'
Crush Depth = 640'