Seoul - Class, Chosen Oceangoing Submarine laid down 1944
Displacement:
1.248 t light; 1.278 t standard; 1.386 t normal; 1.472 t full load
Dimensions: Length overall / water x beam x draught
251,97 ft / 251,97 ft x 24,44 ft x 16,08 ft (normal load)
76,80 m / 76,80 m x 7,45 m x 4,90 m
Armament:
1 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1944 Model
Breech loading gun in deck mount
on centreline forward, 1 raised gun
2 - 0,79" / 20,0 mm guns (1x2 guns), 0,24lbs / 0,11kg shells, 1944 Model
Machine guns in deck mount
on centreline amidships, all raised guns - superfiring
Weight of broadside 36 lbs / 16 kg
Shells per gun, main battery: 110
6 - 21,0" / 533,4 mm submerged torpedo tubes
Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 3.197 shp / 2.385 Kw = 17,50 kts
Range 7.500nm at 10,00 kts
Bunker at max displacement = 194 tons
Complement:
113 - 147
Cost:
£0,396 million / $1,585 million
Distribution of weights at normal displacement:
Armament: 4 tons, 0,3%
Machinery: 82 tons, 5,9%
Hull, fittings & equipment: 912 tons, 65,8%
Fuel, ammunition & stores: 138 tons, 9,9%
Miscellaneous weights: 250 tons, 18,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.021 lbs / 463 Kg = 28,9 x 4,1 " / 105 mm shells or 0,7 torpedoes
Stability (Unstable if below 1.00): 1,12
Metacentric height 0,8 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: 0,490
Length to Beam Ratio: 10,31 : 1
'Natural speed' for length: 15,87 kts
Power going to wave formation at top speed: 45 %
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 (20%): 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): 71,9%
- Above water (accommodation/working, high = better): 0,0%
Waterplane Area: 4.066 Square feet or 378 Square metres
Displacement factor (Displacement / loading): 309%
Structure weight / hull surface area: 146 lbs/sq ft or 714 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 4,26
- Longitudinal: 2,27
- Overall: 2,66
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
Only for internal use; not official
Diving depth: 266 feet
Emergency Depth: 400 feet
Crush Depth: 665 feet
Breakdown of Misc. Weight:
50 tons for torpedos
200 tons for ballast