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SS A1 Class, United Kingdom Submarine laid down 1906

Displacement:
   200 t light; 206 t standard; 210 t normal; 213 t full load

Dimensions: Length overall / water x beam x draught
   125.00 ft / 125.00 ft x 18.65 ft x 7.00 ft (normal load)
   38.10 m / 38.10 m x 5.68 m  x 2.13 m

Armament:
      1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1906 Model
     Quick firing gun in deck mount
     on centreline forward
   Weight of broadside 14 lbs / 6 kg
   Shells per gun, main battery: 150
   2 - 18.0" / 457.2 mm submerged torpedo tubes

Machinery:
   Petrol Internal combustion generators,
   Electric motors, 2 shafts, 249 shp / 186 Kw = 11.50 kts
   Range 1,500nm at 5.00 kts
   Bunker at max displacement = 8 tons

Complement:
   26 - 35

Cost:
   £0.011 million / $0.043 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.8 %
   Machinery: 16 tons, 7.7 %
   Hull, fittings & equipment: 132 tons, 63.1 %
   Fuel, ammunition & stores: 10 tons, 4.5 %
   Miscellaneous weights: 50 tons, 23.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     142 lbs / 64 Kg = 10.5 x 3.0 " / 76 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.30
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 9.8 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: 0.450
   Length to Beam Ratio: 6.70 : 1
   'Natural speed' for length: 11.18 kts
   Power going to wave formation at top speed: 44 %
   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): 84.1 %
      - Above water (accommodation/working, high = better): 0.0 %
   Waterplane Area: 1,487 Square feet or 138 Square metres
   Displacement factor (Displacement / loading): 219 %
   Structure weight / hull surface area: 74 lbs/sq ft or 360 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 3.71
      - Longitudinal: 1.67
      - Overall: 2.04
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is extremely poor
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability


A1 (in service 1/7/1906)
A2-A6 (in service 1/1/1907)
A7-A10 (in service 1/7/1907)

Reserved for Type A info

Reserved for Type B info

Type C Submersible - 1st unit laid down: 1916

500t Surfaced
14 knots surfaced; 4000 n. mi. @ 8 kts.
10 knots submerged; 60 n. mi @ 5 kts.

1 x 3"/L40 QF gun with 300 rounds
3 x 20" torpedo tubes forward - 5 torpedoes
1 x 20" torpedo tube aft - 1 torpedo