HIJMS Izumo (WNT Maximum)

HIJMS Izumo, Japanese Izumo-class battleship laid down 1924 (Engine 1926)

Displacement:
	41,965 t light; 44,127 t standard; 46,564 t normal; 48,513 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(758.52 ft / 738.19 ft) x 111.55 ft x (31.17 / 32.26 ft)
	(231.20 m / 225.00 m) x 34.00 m  x (9.50 / 9.83 m)

Armament:
      9 - 16.14" / 410 mm 45.0 cal guns - 2,204.62lbs / 1,000.00kg shells, 90 per gun
	  Breech loading guns in turret on barbette mounts, 1924 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
      8 - 5.51" / 140 mm 50.0 cal guns - 83.78lbs / 38.00kg shells, 170 per gun
	  Breech loading guns in turret on barbette mounts, 1924 Model
	  4 x Twin mounts on sides, evenly spread
      16 - 5.00" / 127 mm 40.0 cal guns - 51.70lbs / 23.45kg shells, 280 per gun
	  Dual purpose guns in deck and hoist mounts, 1924 Model
	  8 x Twin mounts on sides, evenly spread
		4 raised mounts
      24 - 1.57" / 40.0 mm 62.0 cal guns - 1.98lbs / 0.90kg shells, 1,600 per gun
	  Anti-air guns in deck mounts, 1924 Model
	  12 x Twin mounts on sides, evenly spread
      48 - 0.50" / 12.7 mm 62.0 cal guns - 0.08lbs / 0.04kg shells, 2,000 per gun
	  Anti-air guns in deck mounts, 1924 Model
	  8 x 2 row quad mounts on sides, evenly spread
	  4 x 2 row quad mounts on centreline, evenly spread
      Weight of broadside 21,391 lbs / 9,703 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	12.0" / 305 mm	377.95 ft / 115.20 m	12.66 ft / 3.86 m
	Ends:	3.15" / 80 mm	360.20 ft / 109.79 m	12.66 ft / 3.86 m
	Upper:	8.00" / 203 mm	377.95 ft / 115.20 m	8.01 ft / 2.44 m
	  Main Belt covers 79 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		5.51" / 140 mm	377.95 ft / 115.20 m	29.79 ft / 9.08 m
	Beam between torpedo bulkheads 98.43 ft / 30.00 m

   - Hull void:
		0.00" / 0 mm	  0.00 ft / 0.00 m	0.00 ft / 0.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	15.0" / 380 mm	8.00" / 203 mm		12.0" / 305 mm
	2nd:	6.00" / 152 mm	6.00" / 152 mm		5.00" / 127 mm
	3rd:	5.51" / 140 mm	3.15" / 80 mm		5.51" / 140 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 5.67" / 144 mm
	Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 14.53" / 369 mm, Aft 6.00" / 152 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 136,611 shp / 101,912 Kw = 28.25 kts
	Range 8,000nm at 14.00 kts
	Bunker at max displacement = 4,386 tons

Complement:
	1,584 - 2,060

Cost:
	£12.430 million / $49.721 million

Distribution of weights at normal displacement:
	Armament: 4,154 tons, 8.9 %
	   - Guns: 4,154 tons, 8.9 %
	Armour: 16,072 tons, 34.5 %
	   - Belts: 4,302 tons, 9.2 %
	   - Torpedo bulkhead: 2,296 tons, 4.9 %
	   - Armament: 3,952 tons, 8.5 %
	   - Armour Deck: 4,949 tons, 10.6 %
	   - Conning Towers: 572 tons, 1.2 %
	Machinery: 4,373 tons, 9.4 %
	Hull, fittings & equipment: 16,941 tons, 36.4 %
	Fuel, ammunition & stores: 4,599 tons, 9.9 %
	Miscellaneous weights: 425 tons, 0.9 %
	   - Hull below water: 100 tons
	   - Hull void weights: 100 tons
	   - Hull above water: 100 tons
	   - On freeboard deck: 75 tons
	   - Above deck: 50 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  70,619 lbs / 32,032 Kg = 33.6 x 16.1 " / 410 mm shells or 12.4 torpedoes
	Stability (Unstable if below 1.00): 1.11
	Metacentric height 7.2 ft / 2.2 m
	Roll period: 17.5 seconds
	Steadiness	- As gun platform (Average = 50 %): 70 %
			- Recoil effect (Restricted arc if above 1.00): 0.82
	Seaboat quality  (Average = 1.00): 1.24

Hull form characteristics:
	Hull has a flush deck,
	  a straight bulbous bow and a cruiser stern
	Block coefficient (normal/deep): 0.635 / 0.639
	Length to Beam Ratio: 6.62 : 1
	'Natural speed' for length: 27.17 kts
	Power going to wave formation at top speed: 54 %
	Trim (Max stability = 0, Max steadiness = 100): 57
	Bow angle (Positive = bow angles forward): 25.00 degrees
	Stern overhang: 6.56 ft / 2.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	24.40 %,  29.53 ft / 9.00 m,  26.25 ft / 8.00 m
	   - Forward deck:	25.60 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Aft deck:	25.60 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Quarter deck:	24.40 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Average freeboard:		26.57 ft / 8.10 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 78.4 %
		- Above water (accommodation/working, high = better): 196.4 %
	Waterplane Area: 62,216 Square feet or 5,780 Square metres
	Displacement factor (Displacement / loading): 106 %
	Structure weight / hull surface area: 218 lbs/sq ft or 1,065 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.94
		- Longitudinal: 1.72
		- Overall: 1.00
	Excellent machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Ship has slow, easy roll, a good, steady gun platform
	Good seaboat, rides out heavy weather easily

Lead ship of the Izumo-class battleships. Converted in 1938 to a fleet carrier. Machinery and turrets served as prototypes for the Yamato-class battleships. Alternative to the Number 13-class battleships, to better comply with Washington Naval Treaty restrictions.