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Falcon class French Coastal Submarine
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This is a short-range submarine designed for coast defense duties.

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


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