BBV Shinano

JS Shinano, JMSDF Aviation Battleship laid down 1950

Displacement:
	77,151 t light; 81,030 t standard; 85,288 t normal; 88,695 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(1,155.19 ft / 1,115.49 ft) x 124.67 ft x (34.84 / 36.00 ft)
	(352.10 m / 340.00 m) x 38.00 m  x (10.62 / 10.97 m)

Armament:
      8 - 18.11" / 460 mm 45.0 cal guns - 3,218.75lbs / 1,460.00kg shells, 130 per gun
	  Breech loading guns in turret on barbette mounts, 1950 Model
	  2 x 4-gun mounts on centreline, forward deck forward
		1 raised mount - superfiring
      16 - 3.94" / 100 mm 65.0 cal guns - 28.66lbs / 13.00kg shells, 400 per gun
	  Dual purpose guns in turret on barbette mounts, 1950 Model
	  4 x 2-gun mounts on sides, forward deck aft
		2 raised mounts - superfiring
	  4 x 2-gun mounts on sides, aft deck forward
		2 raised mounts - superfiring
      96 - 1.57" / 40.0 mm 56.3 cal guns - 1.98lbs / 0.90kg shells, 2,000 per gun
	  Anti-air guns in deck mounts, 1950 Model
	  20 x Quad mounts on sides, evenly spread
		10 raised mounts
	  4 x Quad mounts on centreline, forward evenly spread
      Weight of broadside 26,399 lbs / 11,974 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	16.1" / 410 mm	348.69 ft / 106.28 m	13.39 ft / 4.08 m
	Ends:	0.24" / 6 mm	766.77 ft / 233.71 m	13.39 ft / 4.08 m
	Upper:	0.24" / 6 mm	348.69 ft / 106.28 m	8.01 ft / 2.44 m
	  Main Belt covers 48 % of normal length
	  Main Belt inclined -15.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		11.0" / 280 mm	348.69 ft / 106.28 m	33.07 ft / 10.08 m
	Beam between torpedo bulkheads 118.11 ft / 36.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	22.4" / 570 mm	9.06" / 230 mm		21.3" / 540 mm
	2nd:	7.09" / 180 mm	3.15" / 80 mm		7.09" / 180 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 9.02" / 229 mm
	Forecastle: 0.24" / 6 mm  Quarter deck: 0.24" / 6 mm

   - Conning towers: Forward 22.44" / 570 mm, Aft 20.08" / 510 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 166,011 shp / 123,844 Kw = 28.07 kts
	Range 10,000nm at 15.00 kts
	Bunker at max displacement = 7,665 tons

Complement:
	2,494 - 3,243

Cost:
	£43.629 million / $174.515 million

Distribution of weights at normal displacement:
	Armament: 4,786 tons, 5.6 %
	   - Guns: 4,786 tons, 5.6 %
	Armour: 26,966 tons, 31.6 %
	   - Belts: 3,815 tons, 4.5 %
	   - Torpedo bulkhead: 4,703 tons, 5.5 %
	   - Armament: 7,354 tons, 8.6 %
	   - Armour Deck: 9,319 tons, 10.9 %
	   - Conning Towers: 1,775 tons, 2.1 %
	Machinery: 3,972 tons, 4.7 %
	Hull, fittings & equipment: 35,877 tons, 42.1 %
	Fuel, ammunition & stores: 8,137 tons, 9.5 %
	Miscellaneous weights: 5,550 tons, 6.5 %
	   - Hull below water: 1,500 tons
	   - Hull above water: 1,500 tons
	   - On freeboard deck: 1,800 tons
	   - Above deck: 750 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  229,255 lbs / 103,988 Kg = 77.2 x 18.1 " / 460 mm shells or 55.0 torpedoes
	Stability (Unstable if below 1.00): 1.08
	Metacentric height 8.1 ft / 2.5 m
	Roll period: 18.4 seconds
	Steadiness	- As gun platform (Average = 50 %): 71 %
			- Recoil effect (Restricted arc if above 1.00): 0.93
	Seaboat quality  (Average = 1.00): 1.91

Hull form characteristics:
	Hull has a flush deck,
	  an extended bulbous bow and a round stern
	Block coefficient (normal/deep): 0.616 / 0.620
	Length to Beam Ratio: 8.95 : 1
	'Natural speed' for length: 33.40 kts
	Power going to wave formation at top speed: 38 %
	Trim (Max stability = 0, Max steadiness = 100): 37
	Bow angle (Positive = bow angles forward): 35.00 degrees
	Stern overhang: 9.84 ft / 3.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	34.37 %,  42.65 ft / 13.00 m,  39.37 ft / 12.00 m
	   - Forward deck:	15.63 %,  39.37 ft / 12.00 m,  39.37 ft / 12.00 m
	   - Aft deck:	15.63 %,  39.37 ft / 12.00 m,  39.37 ft / 12.00 m
	   - Quarter deck:	34.37 %,  39.37 ft / 12.00 m,  39.37 ft / 12.00 m
	   - Average freeboard:		39.82 ft / 12.14 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 48.1 %
		- Above water (accommodation/working, high = better): 310.4 %
	Waterplane Area: 103,242 Square feet or 9,591 Square metres
	Displacement factor (Displacement / loading): 136 %
	Structure weight / hull surface area: 247 lbs/sq ft or 1,205 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.53
		- Overall: 1.00
	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

JS Shinano is a Shinano-class Aviation Battleship in service with the JMSDF. Laid down mid 1969. Introduced to replace the rapidly aging JS Nara in the naval gunfire support role, and to provide limited air superiority and CAS for amphibious operations, the Shinano quickly proved her value as a gunnery platform and support vessel, thanks to her large guns and V/STOL Harrier fighters, although her initial ad-hoc helicopter wing did not earn her much praise.