J/BB/1914, Japan Battleship laid down 1914
Displacement:
29,105 t light; 30,700 t standard; 34,400 t normal; 37,360 t full load
Dimensions: Length overall / water x beam x draught
686.96 ft / 685.00 ft x 102.00 ft x 31.00 ft (normal load)
209.38 m / 208.79 m x 31.09 m x 9.45 m
Armament:
12 - 14.00" / 356 mm guns (6x2 guns), 1,372.00lbs / 622.33kg shells, 1914 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread, 3 raised mounts
16 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1914 Model
Breech loading guns in casemate mounts
on side, all amidships, 8 raised mounts - superfiring
2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1914 Model
Anti-aircraft guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
8 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1914 Model
Quick firing guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 17,867 lbs / 8,104 kg
Shells per gun, main battery: 90
4 - 21.0" / 533.4 mm submerged torpedo tubes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 10.0" / 254 mm 570.00 ft / 173.74 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 128 % of normal length
- Torpedo Bulkhead:
2.00" / 51 mm 570.00 ft / 173.74 m 30.00 ft / 9.14 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 279 mm 8.00" / 203 mm 10.0" / 254 mm
2nd: 5.00" / 127 mm 5.00" / 127 mm 5.00" / 127 mm
- Armour deck: 3.00" / 76 mm, Conning tower: 11.00" / 279 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 50,548 shp / 37,709 Kw = 23.00 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 6,660 tons
Complement:
1,262 - 1,641
Cost:
£4.031 million / $16.125 million
Distribution of weights at normal displacement:
Armament: 2,233 tons, 6.5 %
Armour: 10,924 tons, 31.8 %
- Belts: 2,812 tons, 8.2 %
- Torpedo bulkhead: 1,265 tons, 3.7 %
- Armament: 3,875 tons, 11.3 %
- Armour Deck: 2,721 tons, 7.9 %
- Conning Tower: 251 tons, 0.7 %
Machinery: 1,947 tons, 5.7 %
Hull, fittings & equipment: 14,000 tons, 40.7 %
Fuel, ammunition & stores: 5,295 tons, 15.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
49,233 lbs / 22,331 Kg = 35.9 x 14.0 " / 356 mm shells or 8.4 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 5.6 ft / 1.7 m
Roll period: 18.1 seconds
Steadiness - As gun platform (Average = 50 %): 76 %
- Recoil effect (Restricted arc if above 1.00): 0.96
Seaboat quality (Average = 1.00): 1.53
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.556
Length to Beam Ratio: 6.72 : 1
'Natural speed' for length: 26.17 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: -2.00 ft / -0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.00 ft / 8.53 m
- Forecastle (20 %): 25.00 ft / 7.62 m
- Mid (67 %): 25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break)
- Quarterdeck (15 %): 17.00 ft / 5.18 m
- Stern: 17.00 ft / 5.18 m
- Average freeboard: 22.60 ft / 6.89 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 85.7 %
- Above water (accommodation/working, high = better): 168.6 %
Waterplane Area: 49,031 Square feet or 4,555 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 202 lbs/sq ft or 988 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.55
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
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.
Wednesday, February 01, 2006
How about a Japanese battleship: J/BB/1914
The next obvious series seemed to be the Japanese, and I would start with the 1914 battleship design: J/BB/1914. I found that to do what I expected the size was inflated. Springsharp likes the result, so I do as well. The obvious starting point was for a main armament of 12-14in guns in twin turrets and a 23 knot speed. I wanted a suitable range for Pacific warfare, so design has a range of 10,000nm at 15 knots. That probably is a factor in the size inflation. This is the Springsharp report:
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