HIJMS Nara

HIJMS Nara, Imperial Japanes Navy Nara-class Battleship laid down 1939

Displacement:
	80,789 t light; 85,046 t standard; 89,672 t normal; 93,373 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(1,018.38 ft / 984.25 ft) x 118.11 ft x (42.65 / 44.13 ft)
	(310.40 m / 300.00 m) x 36.00 m  x (13.00 / 13.45 m)

Armament:
      8 - 18.11" / 460 mm 45.0 cal guns - 2,995.22lbs / 1,358.61kg shells, 150 per gun
	  Breech loading guns in turret on barbette mounts, 1939 Model
	  2 x 2-gun mounts on centreline, forward deck forward
		1 raised mount - superfiring
	  2 x 2-gun mounts on centreline, aft deck aft
		1 raised mount aft - superfiring
      6 - 6.10" / 155 mm 60.0 cal guns - 124.45lbs / 56.45kg shells, 150 per gun
	  Dual purpose guns in turret on barbette mounts, 1939 Model
	  2 x 3-gun mounts on centreline ends, evenly spread
		2 double raised mounts
      24 - 5.00" / 127 mm 40.0 cal guns - 77.16lbs / 35.00kg shells, 300 per gun
	  Dual purpose guns in deck and hoist mounts, 1939 Model
	  12 x Twin mounts on sides, evenly spread
		6 raised mounts
      150 - 1.00" / 25.4 mm 60.0 cal guns - 0.57lbs / 0.26kg shells, 2,000 per gun
	  Anti-air guns in deck mounts, 1939 Model
	  40 x Triple mounts on sides, evenly spread
		20 raised mounts
	  30 x Single mounts on sides, evenly spread
		10 raised mounts
      4 - 0.52" / 13.2 mm 76.0 cal guns - 0.11lbs / 0.05kg shells, 2,500 per gun
	  Machine guns in deck mounts, 1939 Model
	  2 x Twin mounts on sides amidships
		2 double raised mounts
      Weight of broadside 26,647 lbs / 12,087 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.5" / 343 mm	639.76 ft / 195.00 m	13.06 ft / 3.98 m
	Ends:	6.30" / 160 mm	344.46 ft / 104.99 m	13.06 ft / 3.98 m
	Upper:	11.8" / 300 mm	639.76 ft / 195.00 m	8.01 ft / 2.44 m
	  Main Belt covers 100 % of normal length
	  Main Belt inclined -20.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		5.51" / 140 mm	639.76 ft / 195.00 m	40.72 ft / 12.41 m
	Beam between torpedo bulkheads 95.14 ft / 29.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	23.6" / 600 mm	9.45" / 240 mm		22.8" / 580 mm
	2nd:	7.87" / 200 mm	6.30" / 160 mm		7.87" / 200 mm
	3rd:	5.00" / 127 mm	2.95" / 75 mm		5.00" / 127 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 9.06" / 230 mm
	Forecastle: 6.30" / 160 mm  Quarter deck: 6.30" / 160 mm

   - Conning towers: Forward 25.59" / 650 mm, Aft 23.62" / 600 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 180,005 shp / 134,284 Kw = 28.28 kts
	Range 10,000nm at 15.00 kts
	Bunker at max displacement = 8,327 tons

Complement:
	2,590 - 3,368

Cost:
	£34.723 million / $138.891 million

Distribution of weights at normal displacement:
	Armament: 5,105 tons, 5.7 %
	   - Guns: 5,105 tons, 5.7 %
	Armour: 40,001 tons, 44.6 %
	   - Belts: 8,384 tons, 9.3 %
	   - Torpedo bulkhead: 5,312 tons, 5.9 %
	   - Armament: 10,244 tons, 11.4 %
	   - Armour Deck: 13,937 tons, 15.5 %
	   - Conning Towers: 2,124 tons, 2.4 %
	Machinery: 4,870 tons, 5.4 %
	Hull, fittings & equipment: 30,138 tons, 33.6 %
	Fuel, ammunition & stores: 8,884 tons, 9.9 %
	Miscellaneous weights: 675 tons, 0.8 %
	   - Hull below water: 250 tons
	   - Hull above water: 185 tons
	   - On freeboard deck: 155 tons
	   - Above deck: 85 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  202,431 lbs / 91,821 Kg = 68.2 x 18.1 " / 460 mm shells or 47.6 torpedoes
	Stability (Unstable if below 1.00): 1.03
	Metacentric height 6.8 ft / 2.1 m
	Roll period: 19.0 seconds
	Steadiness	- As gun platform (Average = 50 %): 60 %
			- Recoil effect (Restricted arc if above 1.00): 0.99
	Seaboat quality  (Average = 1.00): 1.86

Hull form characteristics:
	Hull has a flush deck,
	  an extended bulbous bow and a round stern
	Block coefficient (normal/deep): 0.633 / 0.637
	Length to Beam Ratio: 8.33 : 1
	'Natural speed' for length: 31.37 kts
	Power going to wave formation at top speed: 44 %
	Trim (Max stability = 0, Max steadiness = 100): 32
	Bow angle (Positive = bow angles forward): 35.00 degrees
	Stern overhang: 6.56 ft / 2.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	17.50 %,  39.37 ft / 12.00 m,  36.09 ft / 11.00 m
	   - Forward deck:	32.50 %,  36.09 ft / 11.00 m,  36.09 ft / 11.00 m
	   - Aft deck:	32.50 %,  36.09 ft / 11.00 m,  36.09 ft / 11.00 m
	   - Quarter deck:	17.50 %,  36.09 ft / 11.00 m,  36.09 ft / 11.00 m
	   - Average freeboard:		36.32 ft / 11.07 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 56.0 %
		- Above water (accommodation/working, high = better): 232.7 %
	Waterplane Area: 87,672 Square feet or 8,145 Square metres
	Displacement factor (Displacement / loading): 121 %
	Structure weight / hull surface area: 238 lbs/sq ft or 1,162 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.66
		- Overall: 1.00
	Excellent machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Excellent seaboat, comfortable, can fire her guns in the heaviest weather

A large and relatively fast battleship, armed with 18.1 inch guns and, theoretically, armored against the same. Refitted after 1942 to improve AA performance.