Submarines

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Information on Submarines of the Royal Navy.

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Ships in Class: A-1 through A-6

A Class, United Kingdom Submarine laid down 1900

Displacement:
   250 t light; 255 t standard; 265 t normal; 273 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (115.00 ft / 115.00 ft) x 13.00 ft x (11.00 / 11.27 ft)
   (35.05 m / 35.05 m) x 3.96 m  x (3.35 / 3.43 m)

Machinery:
   Petrol Internal combustion generators plus batteries,
   Electric motors, 2 shafts, 362 shp / 270 Kw = 12.00 kts
   Range 750nm at 8.00 kts
   Bunker at max displacement = 18 tons

Complement:
   32 - 42

Cost:
   £0.020 million / $0.081 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.0 %
   Machinery: 82 tons, 31.0 %
   Hull, fittings & equipment: 93 tons, 34.9 %
   Fuel, ammunition & stores: 15 tons, 5.8 %
   Miscellaneous weights: 75 tons, 28.3 %
      - Hull below water: 75 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     76 lbs / 34 Kg = 0.7 x 6 " / 152 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.00
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 11.3 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,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.564 / 0.567
   Length to Beam Ratio: 8.85 : 1
   'Natural speed' for length: 10.72 kts
   Power going to wave formation at top speed: 49 %
   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 %,  0.00 ft / 0.00 m,  0.00 ft / 0.00 m
      - Forward deck:   30.00 %,  0.00 ft / 0.00 m,  0.00 ft / 0.00 m
      - Aft deck:   0.00 %,  0.00 ft / 0.00 m,  0.00 ft / 0.00 m
      - Quarter deck:   15.00 %,  0.00 ft / 0.00 m,  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): 131.2 %
      - Above water (accommodation/working, high = better): 0.0 %
   Waterplane Area: 1,057 Square feet or 98 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 51 lbs/sq ft or 250 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 2.53
      - Longitudinal: 2.72
      - Overall: 2.55
   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