Submarines

[KWorld]

Submarines of the USN

[KWorld]

USS Adder, United States Submarine laid down 1900

Displacement:
   100 t light; 102 t standard; 107 t normal; 111 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (66.00 ft / 66.00 ft) x 12.00 ft x (9.00 / 9.25 ft)
   (20.12 m / 20.12 m) x 3.66 m  x (2.74 / 2.82 m)

Machinery:
   Petrol Internal combustion generators plus batteries,
   Electric motors, 1 shaft, 158 shp / 118 Kw = 10.50 kts
   Range 1,200nm at 6.00 kts
   Bunker at max displacement = 8 tons

Complement:
   16 - 21

Cost:
   £0.009 million / $0.034 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 36 tons, 33.6 %
   Hull, fittings & equipment: 34 tons, 32.0 %
   Fuel, ammunition & stores: 7 tons, 6.4 %
   Miscellaneous weights: 30 tons, 28.1 %
      - Hull below water: 30 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     30 lbs / 14 Kg = 0.3 x 6 " / 152 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 9.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 1 %
         - 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,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.525 / 0.529
   Length to Beam Ratio: 5.50 : 1
   'Natural speed' for length: 8.12 kts
   Power going to wave formation at top speed: 62 %
   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 (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  0.10 ft / 0.03 m,  0.10 ft / 0.03 m
      - Forward deck:   30.00 %,  0.10 ft / 0.03 m,  0.10 ft / 0.03 m
      - Aft deck:   35.00 %,  0.10 ft / 0.03 m,  0.10 ft / 0.03 m
      - Quarter deck:   15.00 %,  0.10 ft / 0.03 m,  0.10 ft / 0.03 m
      - Average freeboard:      0.10 ft / 0.03 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 139.1 %
      - Above water (accommodation/working, high = better): 0.6 %
   Waterplane Area: 521 Square feet or 48 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 39 lbs/sq ft or 191 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 2.21
      - Longitudinal: 5.17
      - Overall: 2.41
   Cramped machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability

28 tons of below-water miscellaneous weight is ballast tankage.

2 tons of below-water miscellaneous weight support 1 bow 18" short torpedo tube, with 2 reload torpedoes.