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Fantasy Fleet Page
Petrel class Coastal Submarine
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The Petrel class is designed for coastal defense and patrol duties. 

Petrel class, French Coastal Submarine laid down 1907
Displacement:
 435 t light; 447 t standard; 540 t normal; 612 t full load
   Loading submergence 52 tons/feet
Dimensions:
 149.28 ft x 19.69 ft x 13.12 ft (normal load)
 45.50 m x 6.00 m x 4.00 m
Armament:
 1 - 2.95" / 75 mm guns
   Weight of broadside 13 lbs / 6 kg
 4 - 17.7" / 450 mm submerged torpedo tubes forward
        Operational depth - 108m/353 ft
        Emergency depth - 172m/565 ft
        Crush depth - 269m/882 ft
Machinery:
 Diesel Internal combustion generators plus batteries,
 Electric motors, 1 shaft, 920 shp / 686 Kw = 14.00 kts
 Range 5,000nm at 10.00 kts
Complement:
 28 - 36
Cost:
 0.024 million / $0.096 million
Distribution of weights at normal displacement:
 Armament: 2 tons, 0.3 %
 Machinery: 52 tons, 9.7 %
 Hull, fittings & equipment: 291 tons, 54.0 %
 Fuel, ammunition & stores: 105 tons, 19.4 %
 Miscellaneous weights: 90 tons, 16.7 %
 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: 1.11
 Shellfire needed to sink: 271 lbs / 123 Kg = 21.1 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: 0.490
 Sharpness coefficient: 0.36
 Hull speed coefficient 'M': 5.60
 'Natural speed' for length: 12.22 kts
 Power going to wave formation at top speed: 51 %
 Trim: 50
   (Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
 Underwater volume absorbed by magazines and engineering spaces: 102.4 %
 Relative accommodation and working space: 0.0 %
   (Average = 100%)
 Displacement factor: 260 %
   (Displacement relative to loading factors)
 Relative cross-sectional hull strength: 3.55
   (Structure weight / hull surface area: 99 lbs / square foot or 483 Kg / square metre)
 Relative longitudinal hull strength: 3.52
   (for 0.00 ft / 0.00 m average freeboard, freeboard adjustment -8.45 ft)
 Relative composite hull strength: 3.53


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