Falcon class, French Coastal Submarine laid down 1919
Displacement:
440 t light; 451 t standard; 503 t normal; 543 t full load
Loading submergence 50 tons/feet
Dimensions:
147.64 ft x 19.69 ft x 12.89 ft (normal load)
45.00 m x 6.00 m x 3.93 m
Armament:
1 - 2.95" / 75 mm guns
Weight of broadside 13 lbs / 6 kg
4 - 21.0" / 533 mm submerged torpedo tubes forward
25 tons mines
Operational depth - 122m/ 399 ft
Emergency depth - 195m/ 638 ft
crush depth - 304m/ 998 ft
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 488 shp / 364 Kw = 12.00 kts
Range 5,000nm at 10.00 kts
Complement:
53 - 69
Cost:
£0.042 million / $0.167 million
Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Machinery: 17 tons, 3.4 %
Hull, fittings & equipment: 311 tons, 61.9 %
Fuel, ammunition & stores: 63 tons, 12.5 %
Miscellaneous weights: 110 tons, 21.9 %
Metacentric height 0.5
Remarks:
Hull space for machinery, storage & compartmentation is adequate
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: 1.04
Shellfire needed to sink: 280 lbs / 127 Kg = 21.7 x 3.0 " / 75 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 0 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.00
Relative quality as seaboat: 0.00
Hull form characteristics:
Block coefficient: 0.470
Sharpness coefficient: 0.35
Hull speed coefficient 'M': 5.67
'Natural speed' for length: 12.15 kts
Power going to wave formation at top speed: 42 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 91.8 %
Relative accommodation and working space: 0.0 %
(Average = 100%)
Displacement factor: 319 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 3.99
(Structure weight / hull surface area: 110 lbs / square foot or 536 Kg / square metre)
Relative longitudinal hull strength: 3.99
(for 0.00 ft / 0.00 m average freeboard, freeboard adjustment -8.33 ft)
Relative composite hull strength: 3.99