Chukou - Class
Fleet Supply Ship
Displacement:
4.059 t light; 4.171 t standard; 4.537 t normal; 4.829 t full load
Dimensions:
Length (overall / waterline) x beam x draught (normal/deep)
(355,97 ft / 339,68 ft) x 49,21 ft x (16,40 / 17,26 ft)
(108,50 m / 103,53 m) x 15,00 m x (5,00 / 5,26 m)
Armament:
2 - 4,72" / 120 mm 45,0 cal guns - 53,17lbs / 24,12kg shells, 350 per gun
Dual purpose guns in deck and hoist mounts, 1938 Model
2 x 2 row twin mounts on centreline, evenly spread
4 - 0,98" / 25,0 mm 45,0 cal guns - 0,48lbs / 0,22kg shells, 500 per gun
Anti-air guns in deck mounts, 1938 Model
4 x Single mounts on centreline, aft evenly spread
Weight of broadside 108 lbs / 49 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2,95" / 75 mm 266,63 ft / 81,27 m 8,92 ft / 2,72 m
Ends: Unarmoured
Main Belt covers 121% of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2,17" / 55 mm - 0,98" / 25 mm
- Armoured deck - multiple decks:
For and Aft decks: 0,59" / 15 mm
Forecastle: 0,59" / 15 mm Quarter deck: 0,59" / 15 mm
- Conning towers: Forward 2,17" / 55 mm, Aft 0,98" / 25 mm
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 4.509 shp / 3.364 Kw = 16,00 kts
Range 5.500nm at 14,00 kts
Bunker at max displacement = 658 tons
Complement:
276 - 359
Cost:
£0,957 million / $3,826 million
Distribution of weights at normal displacement:
Armament: 31 tons, 0,7%
- Guns: 31 tons, 0,7%
Armour: 453 tons, 10,0%
- Belts: 291 tons, 6,4%
- Armament: 11 tons, 0,2%
- Armour Deck: 132 tons, 2,9%
- Conning Towers: 19 tons, 0,4%
Machinery: 123 tons, 2,7%
Hull, fittings & equipment: 1.782 tons, 39,3%
Fuel, ammunition & stores: 478 tons, 10,5%
Miscellaneous weights: 1.670 tons, 36,8%
- Hull below water: 1.520 tons
- Above deck: 150 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
13.449 lbs / 6.100 Kg = 255,1 x 4,7 " / 120 mm shells or 2,7 torpedoes
Stability (Unstable if below 1.00): 1,24
Metacentric height 2,6 ft / 0,8 m
Roll period: 12,9 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0,09
Seaboat quality (Average = 1.00): 2,00
Hull form characteristics:
Hull has a flush deck,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0,579 / 0,586
Length to Beam Ratio: 6,90 : 1
'Natural speed' for length: 18,43 kts
Power going to wave formation at top speed: 41 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20,00%, 28,22 ft / 8,60 m, 28,22 ft / 8,60 m
- Forward deck: 2,00%, 28,22 ft / 8,60 m, 21,00 ft / 6,40 m
- Aft deck: 63,00%, 21,00 ft / 6,40 m, 21,00 ft / 6,40 m
- Quarter deck: 15,00%, 21,00 ft / 6,40 m, 21,00 ft / 6,40 m
- Average freeboard: 22,51 ft / 6,86 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 48,8%
- Above water (accommodation/working, high = better): 174,7%
Waterplane Area: 11.989 Square feet or 1.114 Square metres
Displacement factor (Displacement / loading): 184%
Structure weight / hull surface area: 77 lbs/sq ft or 378 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,03
- Longitudinal: 6,51
- Overall: 1,24
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Breakdown of Miscellaneous Weight:
- 1080 tons for other Oil Supply
- 440 tons for general storage (ammunitions, foods etc.)
- 150 tons for handling gear and cranes
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Ships in Class:
HICMS Chukou; laid down 1939