HIJMS Nara (as commissioned)

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

Displacement:
	87,673 t light; 91,899 t standard; 96,746 t normal; 100,624 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(1,068.80 ft / 1,033.47 ft) x 134.51 ft x (46.75 / 48.19 ft)
	(325.77 m / 315.00 m) x 41.00 m  x (14.25 / 14.69 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
      12 - 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 sides amidships
	  2 x 3-gun mounts on centreline ends, evenly spread
		2 double raised mounts
      12 - 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
	  6 x Twin mounts on sides, evenly spread
		2 raised mounts
      24 - 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
	  6 x Triple mounts on sides, evenly spread
		2 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 26,395 lbs / 11,973 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	16.1" / 410 mm	413.39 ft / 126.00 m	13.91 ft / 4.24 m
	Ends:	5.00" / 127 mm	620.05 ft / 188.99 m	13.91 ft / 4.24 m
	Upper:	15.0" / 380 mm	413.39 ft / 126.00 m	8.01 ft / 2.44 m
	  Main Belt covers 62 % of normal length
	  Main Belt inclined -20.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		7.48" / 190 mm	413.39 ft / 126.00 m	42.98 ft / 13.10 m
	Beam between torpedo bulkheads 114.83 ft / 35.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	25.6" / 650 mm	      -			23.6" / 600 mm
	2nd:	7.87" / 200 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: 9.02" / 229 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,
	Electric motors, 4 shafts, 226,309 shp / 168,827 Kw = 30.00 kts
	Range 10,000nm at 15.00 kts
	Bunker at max displacement = 8,725 tons

Complement:
	2,742 - 3,565

Cost:
	£37.288 million / $149.153 million

Distribution of weights at normal displacement:
	Armament: 5,242 tons, 5.4 %
	   - Guns: 5,242 tons, 5.4 %
	Armour: 40,340 tons, 41.7 %
	   - Belts: 8,318 tons, 8.6 %
	   - Torpedo bulkhead: 4,917 tons, 5.1 %
	   - Armament: 10,981 tons, 11.4 %
	   - Armour Deck: 13,890 tons, 14.4 %
	   - Conning Towers: 2,234 tons, 2.3 %
	Machinery: 6,123 tons, 6.3 %
	Hull, fittings & equipment: 35,292 tons, 36.5 %
	Fuel, ammunition & stores: 9,074 tons, 9.4 %
	Miscellaneous weights: 675 tons, 0.7 %
	   - 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):
	  218,379 lbs / 99,055 Kg = 73.5 x 18.1 " / 460 mm shells or 52.5 torpedoes
	Stability (Unstable if below 1.00): 1.00
	Metacentric height 7.8 ft / 2.4 m
	Roll period: 20.3 seconds
	Steadiness	- As gun platform (Average = 50 %): 90 %
			- Recoil effect (Restricted arc if above 1.00): 0.91
	Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
	Hull has a flush deck,
	  an extended bulbous bow and a round stern
	Block coefficient (normal/deep): 0.521 / 0.526
	Length to Beam Ratio: 7.68 : 1
	'Natural speed' for length: 32.15 kts
	Power going to wave formation at top speed: 44 %
	Trim (Max stability = 0, Max steadiness = 100): 45
	Bow angle (Positive = bow angles forward): 34.00 degrees
	Stern overhang: 6.56 ft / 2.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	30.00 %,  42.65 ft / 13.00 m,  39.37 ft / 12.00 m
	   - Forward deck:	23.00 %,  39.37 ft / 12.00 m,  39.37 ft / 12.00 m
	   - Aft deck:	17.00 %,  39.37 ft / 12.00 m,  39.37 ft / 12.00 m
	   - Quarter deck:	30.00 %,  39.37 ft / 12.00 m,  39.37 ft / 12.00 m
	   - Average freeboard:		39.76 ft / 12.12 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 54.0 %
		- Above water (accommodation/working, high = better): 258.3 %
	Waterplane Area: 94,428 Square feet or 8,773 Square metres
	Displacement factor (Displacement / loading): 126 %
	Structure weight / hull surface area: 254 lbs/sq ft or 1,241 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.93
		- Longitudinal: 1.94
		- 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

A large and relatively fast battleship, armed with 18.1 inch guns and, theoretically, armored against the same.