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Eagle class French Fleet Submarine
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This is a long-range submarine for duties in the open ocean.

Eagle class, French Fleet Submarine laid down 1920

Displacement:

1,009 t light; 1,036 t standard; 1,200 t normal; 1,327 t full load

Loading submergence 89 tons/feet

Dimensions:

196.85 ft x 26.25 ft x 17.22 ft (normal load)

60.00 m x 8.00 m x 5.25 m

Armament:

1 - 3.94" / 100 mm guns

1 - 1.57" / 40 mm guns

Weight of broadside 32 lbs / 15 kg

6 - 21.0" / 533 mm submerged torpedo tubes (4 tubes fwd, 2 tubes aft)

Operational depth - 121m/398 ft

Emergency depth - 194m/637 ft

Crush depth - 303m/995 ft

Machinery:

Diesel Internal combustion generators plus batteries,

Electric motors, 1 shaft, 1,786 shp / 1,333 Kw = 15.00 kts

Range 10,000nm at 10.00 kts

Complement:

50 - 66

Cost:

0.112 million / $0.449 million

Distribution of weights at normal displacement:

Armament: 4 tons, 0.3 %

Machinery: 62 tons, 5.2 %

Hull, fittings & equipment: 742 tons, 61.9 %

Fuel, ammunition & stores: 191 tons, 15.9 %

Miscellaneous weights: 200 tons, 16.7 %

Metacentric height 0.9

Remarks:

Hull space for machinery, storage & compartmentation is excellent

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: 1.16

Shellfire needed to sink: 850 lbs / 385 Kg = 27.8 x 3.9 " / 100 mm shells

(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)

Torpedoes needed to sink: 0.3

(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: 0.472

Sharpness coefficient: 0.35

Hull speed coefficient 'M': 5.66

'Natural speed' for length: 14.03 kts

Power going to wave formation at top speed: 47 %

Trim: 50

(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:

Underwater volume absorbed by magazines and engineering spaces: 76.1 %

Relative accommodation and working space: 0.0 %

(Average = 100%)

Displacement factor: 336 %

(Displacement relative to loading factors)

Relative cross-sectional hull strength: 3.98

(Structure weight / hull surface area: 147 lbs / square foot or 717 Kg / square metre)

Relative longitudinal hull strength: 4.01

(for 0.00 ft / 0.00 m average freeboard, freeboard adjustment -9.91 ft)

Relative composite hull strength: 3.98


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