IJN Ichilkari 46cm 55 1941

IJN Ichikari, Japan Battleship laid down 1941

Displacement:
	62,750 t light; 66,206 t standard; 71,972 t normal; 76,584 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(972.77 ft / 951.44 ft) x 124.67 ft x (38.06 / 39.99 ft)
	(296.50 m / 290.00 m) x 38.00 m  x (11.60 / 12.19 m)

Armament:
      9 - 18.11" / 460 mm 55.0 cal guns - 3,205.71lbs / 1,454.08kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1941 Model
	  2 x 3-gun mounts on centreline, forward deck forward
		1 raised mount - superfiring
	  1 x 3-gun mount on centreline, aft deck aft
      9 - 5.98" / 152 mm 55.0 cal guns - 115.66lbs / 52.46kg shells, 300 per gun
	  Quick firing guns in deck and hoist mounts, 1941 Model
	  2 x 3-gun mounts on sides, aft deck forward
	  1 x 3-gun mount on centreline, aft deck aft
		1 raised mount
      12 - 3.94" / 100 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 800 per gun
	  Dual purpose guns in deck and hoist mounts, 1941 Model
	  6 x 2-gun mounts on sides, evenly spread
		6 raised mounts
      32 - 1.57" / 40.0 mm 60.0 cal guns - 2.14lbs / 0.97kg shells, 2,000 per gun
	  Anti-air guns in deck mounts, 1941 Model
	  8 x Quad mounts on sides, evenly spread
		4 raised mounts
      Weight of broadside 30,330 lbs / 13,757 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	16.1" / 410 mm	589.90 ft / 179.80 m	13.39 ft / 4.08 m
	Ends:	2.36" / 60 mm	361.52 ft / 110.19 m	13.39 ft / 4.08 m
	  Main Belt covers 95 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		3.15" / 80 mm	589.90 ft / 179.80 m	35.10 ft / 10.70 m
	Beam between torpedo bulkheads 88.58 ft / 27.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	20.9" / 530 mm	10.0" / 255 mm		16.1" / 410 mm
	2nd:	8.07" / 205 mm	4.13" / 105 mm		5.98" / 152 mm
	3rd:	2.95" / 75 mm	2.95" / 75 mm		2.95" / 75 mm
	4th:	0.59" / 15 mm	      -			      -

   - Armoured deck - multiple decks:
	For and Aft decks: 8.46" / 215 mm
	Forecastle: 1.97" / 50 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 13.98" / 355 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 196,812 shp / 146,822 Kw = 30.00 kts
	Range 15,000nm at 15.00 kts
	Bunker at max displacement = 10,378 tons

Complement:
	2,196 - 2,856

Cost:
	£39.387 million / $157.550 million

Distribution of weights at normal displacement:
	Armament: 7,066 tons, 9.8 %
	   - Guns: 7,066 tons, 9.8 %
	Armour: 24,938 tons, 34.6 %
	   - Belts: 5,887 tons, 8.2 %
	   - Torpedo bulkhead: 2,413 tons, 3.4 %
	   - Armament: 5,167 tons, 7.2 %
	   - Armour Deck: 10,950 tons, 15.2 %
	   - Conning Tower: 521 tons, 0.7 %
	Machinery: 5,201 tons, 7.2 %
	Hull, fittings & equipment: 25,445 tons, 35.4 %
	Fuel, ammunition & stores: 9,221 tons, 12.8 %
	Miscellaneous weights: 100 tons, 0.1 %
	   - On freeboard deck: 100 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  101,844 lbs / 46,195 Kg = 34.3 x 18.1 " / 460 mm shells or 17.2 torpedoes
	Stability (Unstable if below 1.00): 1.13
	Metacentric height 8.8 ft / 2.7 m
	Roll period: 17.7 seconds
	Steadiness	- As gun platform (Average = 50 %): 64 %
			- Recoil effect (Restricted arc if above 1.00): 0.63
	Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
	Hull has a flush deck,
	  an extended bulbous bow and a round stern
	Block coefficient (normal/deep): 0.558 / 0.565
	Length to Beam Ratio: 7.63 : 1
	'Natural speed' for length: 30.85 kts
	Power going to wave formation at top speed: 47 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 22.00 degrees
	Stern overhang: 6.56 ft / 2.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	19.30 %,  34.78 ft / 10.60 m,  23.62 ft / 7.20 m
	   - Forward deck:	38.00 %,  23.62 ft / 7.20 m,  23.62 ft / 7.20 m
	   - Aft deck:	23.40 %,  23.62 ft / 7.20 m,  23.62 ft / 7.20 m
	   - Quarter deck:	19.30 %,  23.62 ft / 7.20 m,  24.93 ft / 7.60 m
	   - Average freeboard:		24.61 ft / 7.50 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 94.3 %
		- Above water (accommodation/working, high = better): 170.9 %
	Waterplane Area: 83,406 Square feet or 7,749 Square metres
	Displacement factor (Displacement / loading): 105 %
	Structure weight / hull surface area: 247 lbs/sq ft or 1,204 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.98
		- Longitudinal: 1.17
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Good seaboat, rides out heavy weather easily