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Molchkom class, Russian Coast Defense Submarine laid down 1928
Displacement:
430 t light;
444 t standard; 637 t normal; 791 t full load
Dimensions: Length overall / water x beam x draught
164.04 ft /
164.04 ft x 22.15 ft x 13.94 ft (normal load)
50.00 m / 50.00 m x 6.75 m x 4.25 m
Armament:
1 - 2.95" / 75.0
mm guns in single mounts, 12.87lbs / 5.84kg shells, 1928 Model
Quick firing gun in deck mount
on centreline forward
1 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1928 Model
Anti-aircraft gun in deck mount
on
centreline aft
Weight of broadside 14 lbs / 7 kg
Shells per gun, main battery: 150
6 - 20.9" / 530 mm above water
torpedoes, 6 - 20.9" / 530 mm submerged torpedo tubes
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 974 shp / 727 Kw = 14.00 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement
= 347 tons
Complement:
31 - 41
Cost:
£0.079 million / $0.318 million
Distribution of weights
at normal displacement:
Armament: 2 tons, 0.3 %
Machinery: 30 tons, 4.8 %
Hull, fittings & equipment: 268
tons, 42.0 %
Fuel, ammunition & stores: 207 tons, 32.5 %
Miscellaneous weights: 130 tons, 20.4 %
Overall
survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
190 lbs /
86 Kg = 14.7 x 3.0 " / 75 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.6
ft / 0.2 m
Roll period: 11.8 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: 0.440
Length to Beam Ratio: 7.41 : 1
'Natural speed' for length: 12.81 kts
Power going
to wave formation at top speed: 46 %
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 (25 %): 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): 132.5 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 2,299 Square feet or
214 Square metres
Displacement factor (Displacement / loading): 311 %
Structure weight / hull surface area: 77 lbs/sq
ft or 376 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.56
- Longitudinal: 2.57
- Overall: 2.56
Hull space for machinery, storage, compartmentation is cramped
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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