Yashima, Japan battleship laid down 1944 (Engine 1947)
Displacement:
68 686 t light; 71 428 t standard; 75 857 t normal; 79 401 t full load
Dimensions: Length overall / water x beam x draught
862,85 ft / 846,46 ft x 127,62 ft x 34,78 ft (normal load)
263,00 m / 258,00 m x 38,90 m x 10,60 m
Armament:
6 - 20,08" / 510 mm guns (3x2 guns), 4 047,43lbs / 1 835,88kg shells, 1944 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward
40 - 3,94" / 100 mm guns (20x2 guns), 30,51lbs / 13,84kg shells, 1944 Model
Dual purpose guns in turrets (on barbettes)
on centreline ends, evenly spread
126 - 0,98" / 25,0 mm guns (42x3 guns), 0,48lbs / 0,22kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 25 565 lbs / 11 596 kg
Shells per gun, main battery: 85
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 18,1" / 460 mm 561,02 ft / 171,00 m 17,72 ft / 5,40 m
Ends: 15,0" / 380 mm 147,64 ft / 45,00 m 9,84 ft / 3,00 m
137,80 ft / 42,00 m Unarmoured ends
Main Belt covers 102% of normal length
- Torpedo Bulkhead:
3,54" / 90 mm 674,21 ft / 205,50 m 32,81 ft / 10,00 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 25,6" / 650 mm 13,0" / 330 mm 22,0" / 560 mm
2nd: 1,18" / 30 mm 0,79" / 20 mm 1,97" / 50 mm
- Armour deck: 9,84" / 250 mm, Conning tower: 19,69" / 500 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 229 908 shp / 171 511 Kw = 30,00 kts
Range 9 700nm at 16,00 kts
Bunker at max displacement = 7 973 tons
Complement:
2 285 - 2 971
Cost:
£39,580 million / $158,319 million
Distribution of weights at normal displacement:
Armament: 3 196 tons, 4,2%
Armour: 34 325 tons, 45,2%
- Belts: 8 666 tons, 11,4%
- Torpedo bulkhead: 2 900 tons, 3,8%
- Armament: 6 138 tons, 8,1%
- Armour Deck: 15 861 tons, 20,9%
- Conning Tower: 760 tons, 1,0%
Machinery: 5 680 tons, 7,5%
Hull, fittings & equipment: 25 486 tons, 33,6%
Fuel, ammunition & stores: 7 172 tons, 9,5%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
147 597 lbs / 66 949 Kg = 36,5 x 20,1 " / 510 mm shells or 29,3 torpedoes
Stability (Unstable if below 1.00): 1,33
Metacentric height 12,0 ft / 3,6 m
Roll period: 15,5 seconds
Steadiness - As gun platform (Average = 50 %): 38 %
- Recoil effect (Restricted arc if above 1.00): 0,36
Seaboat quality (Average = 1.00): 0,83
Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0,707
Length to Beam Ratio: 6,63 : 1
'Natural speed' for length: 29,09 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 26,55 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 32,81 ft / 10,00 m
- Forecastle (19%): 23,29 ft / 7,10 m
- Mid (20%): 27,89 ft / 8,50 m
- Quarterdeck (8%): 19,69 ft / 6,00 m (27,89 ft / 8,50 m before break)
- Stern: 19,69 ft / 6,00 m
- Average freeboard: 27,06 ft / 8,25 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66,9%
- Above water (accommodation/working, high = better): 202,3%
Waterplane Area: 87 105 Square feet or 8 092 Square metres
Displacement factor (Displacement / loading): 106%
Structure weight / hull surface area: 220 lbs/sq ft or 1 075 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,97
- Longitudinal: 1,27
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather
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