J/CB/1933, Japan Battlecruiser laid down 1933
Displacement:
81,822 t light; 85,270 t standard; 90,800 t normal; 95,224 t full load
Dimensions: Length overall / water x beam x draught
980.78 ft / 975.00 ft x 124.00 ft x 35.00 ft (normal load)
298.94 m / 297.18 m x 37.80 m x 10.67 m
Armament:
10 - 18.00" / 457 mm guns (4 mounts), 2,916.00lbs / 1,322.68kg shells, 1933 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1933 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships
20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1933 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, 6 raised mounts
56 - 2.24" / 57.0 mm guns (28x2 guns), 5.65lbs / 2.56kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 18 raised mounts
Weight of broadside 32,022 lbs / 14,525 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 15.0" / 381 mm 640.00 ft / 195.07 m 9.00 ft / 2.74 m
Ends: Unarmoured
Upper: 12.0" / 305 mm 640.00 ft / 195.07 m 8.00 ft / 2.44 m
Main Belt covers 101 % of normal length
- Torpedo Bulkhead:
7.00" / 178 mm 640.00 ft / 195.07 m 34.00 ft / 10.36 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 15.0" / 381 mm 13.0" / 330 mm 15.0" / 381 mm
2nd: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
- Armour deck: 8.00" / 203 mm, Conning tower: 15.00" / 381 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 6 shafts, 353,975 shp / 264,065 Kw = 33.01 kts
Range 11,000nm at 15.00 kts
Bunker at max displacement = 9,955 tons
Complement:
2,614 - 3,399
Cost:
£36.259 million / $145.034 million
Distribution of weights at normal displacement:
Armament: 4,003 tons, 4.4 %
Armour: 35,433 tons, 39.0 %
- Belts: 6,354 tons, 7.0 %
- Torpedo bulkhead: 5,636 tons, 6.2 %
- Armament: 7,792 tons, 8.6 %
- Armour Deck: 14,999 tons, 16.5 %
- Conning Tower: 653 tons, 0.7 %
Machinery: 10,314 tons, 11.4 %
Hull, fittings & equipment: 32,072 tons, 35.3 %
Fuel, ammunition & stores: 8,978 tons, 9.9 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
132,264 lbs / 59,994 Kg = 45.4 x 18.0 " / 457 mm shells or 24.3 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 8.7 ft / 2.7 m
Roll period: 17.6 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.68
Seaboat quality (Average = 1.00): 1.04
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.751
Length to Beam Ratio: 7.86 : 1
'Natural speed' for length: 31.22 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 6.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 36.00 ft / 10.97 m
- Forecastle (20 %): 29.00 ft / 8.84 m
- Mid (67 %): 29.00 ft / 8.84 m
- Quarterdeck (15 %): 29.00 ft / 8.84 m
- Stern: 29.00 ft / 8.84 m
- Average freeboard: 29.56 ft / 9.01 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83.8 %
- Above water (accommodation/working, high = better): 214.2 %
Waterplane Area: 101,347 Square feet or 9,415 Square metres
Displacement factor (Displacement / loading): 103 %
Structure weight / hull surface area: 233 lbs/sq ft or 1,140 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.04
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
This is a forum for discussion of topics relating to the Dreadnought era, prior to the ascendency of naval aviation. We will be discussing history, ship design, and naval wargaming.
Thursday, February 16, 2006
The J/CB/1933 design
This design has ballooned to 90,800 tons, normal displacement. The reason is that the ship is well-armed, moderately well-protected, and has a high speed (well, relatively high speed) of 33 knots. This is the Springsharp report:
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