CS-27 coastal submarine, laid down 1927
Length, 45.5 m x Beam, 6.0 m x Depth, 3.9 m
508 tonnes normal displacement (448 tonnes standard)
Main battery: 1 x 7.5-cm
Secondary battery: 1 x 4.0-cm
Weight of broadside: 7 kg
4 TT, 53.3 cm (submerged)
Hull unarmored
Operational Depth: 388ft/118m
Emergency Depth: 621ft/189m
Crush Depth: 970ft/296m
Maximum speed for 365 shaft kw = 12.00 knots
Approximate cruising radius, 6500 nm / 10 knots
Typical complement: 27-35
Estimated cost, $276,000 (£69,000)
Remarks:
Caution: lacks seaworthiness -- very limited seakeeping ability.
Caution: Very cramped ship with excessively poor habitability;
lacks suitable working space.
Ship has quick, 'lively' roll; not a steady gun platform.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 2 tonnes = 0 pct
Machinery ........................ 15 tonnes = 3 pct
Hull and fittings; equipment ..... 309 tonnes = 61 pct
Fuel, ammunition, stores ......... 72 tonnes = 14 pct
Miscellaneous weights ............ 110 tonnes = 22 pct
-----
508 tonnes = 100 pct
Estimated metacentric height, 0.1 m
Displacement summary:
Light ship: 436 tonnes
Standard displacement: 448 tonnes
Normal service: 508 tonnes
Full load: 555 tonnes
Loading submergence 166 tonnes/metre
+++++++++++++++++++++++++
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.04
Shellfire needed to sink: 125 kg = 21.3 x 7.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 0.1
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 1 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.00
Relative quality as a seaboat: 0.00
+++++++++++++++++++++++++
Hull form characteristics:
Block coefficient: 0.47
Sharpness coefficient: 0.35
Hull speed coefficient 'M' = 5.71
'Natural speed' for length = 12.2 knots
Power going to wave formation
at top speed: 42 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 95 percent
Relative accommodation and working space: 1 percent
Displacement factor: 327 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 3.88
(Structure weight per square
metre of hull surface: 526 kg)
Relative longitudinal hull strength: 3.89
(for 0.03 m average freeboard;
freeboard adjustment -2.51 m)
Relative composite hull strength: 3.88
+++++++++++++++++++++++++
[Machine-readable parameters: Spring Style v. 1.2.1]
149.24 x 19.68 x 12.89; 0.10 -- Dimensions
0.47 -- Block coefficient
1927 -- Year laid down
12.00 / 6500 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
110 tons -- Miscellaneous weights
++++++++++
1 x 2.95; 0 -- Main battery; turrets
Central positioning of guns
:
1 x 1.57; 0 -- Secondary battery; turrets
:
0 -- No tertiary (QF/AA) battery
0 -- No fourth (light) battery
4 / 4 / 20.98 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor
(Note: For portability, values are stored in Anglo-American units)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
CS27, French Submarine laid down 1927
Displacement:
437 t light; 448 t standard; 508 t normal; 556 t full load
Dimensions: Length overall / water x beam x draught
149.28 ft / 149.28 ft x 19.69 ft x 9.84 ft (normal load)
45.50 m / 45.50 m x 6.00 m x 3.00 m
Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1927 Model
Quick firing gun in deck mount
on centreline forward
1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1927 Model
Anti-aircraft gun in deck mount
on centreline aft
Weight of broadside 15 lbs / 7 kg
Shells per gun, main battery: 150
4 - 21.7" / 550 mm above water torpedoes
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 497 shp / 370 Kw = 12.00 kts
Range 6,500nm at 10.00 kts
Bunker at max displacement = 108 tons
Complement:
53 - 69
Cost:
£0.069 million / $0.277 million
Distribution of weights at normal displacement:
Armament: 2 tons, 0.4 %
Machinery: 16 tons, 3.1 %
Hull, fittings & equipment: 309 tons, 60.9 %
Fuel, ammunition & stores: 71 tons, 14.0 %
Miscellaneous weights: 110 tons, 21.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
740 lbs / 336 Kg = 57.5 x 3.0 " / 75 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 0.6 ft / 0.2 m
Roll period: 10.5 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: 0.615
Length to Beam Ratio: 7.58 : 1
'Natural speed' for length: 12.22 kts
Power going to wave formation at top speed: 47 %
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): 37.8 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 2,137 Square feet or 198 Square metres
Displacement factor (Displacement / loading): 325 %
Structure weight / hull surface area: 108 lbs/sq ft or 525 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 4.52
- Longitudinal: 2.25
- Overall: 2.68
Hull space for machinery, storage, compartmentation is excellent
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
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