HIJMS Izumo (27 knots)

HIJMS Izumo, Japanese Izumo-class battleship laid down 1932

Displacement:
	36,655 t light; 38,528 t standard; 40,645 t normal; 42,339 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(742.12 ft / 721.78 ft) x 106.63 ft x (29.53 / 30.56 ft)
	(226.20 m / 220.00 m) x 32.50 m  x (9.00 / 9.31 m)

Armament:
      12 - 14.02" / 356 mm 45.0 cal guns - 1,399.94lbs / 635.00kg shells, 90 per gun
	  Breech loading guns in turret on barbette mounts, 1932 Model
	  2 x 3-gun mounts on centreline, forward deck forward
		1 raised mount - superfiring
	  2 x 3-gun mounts on centreline, aft deck aft
		1 raised mount aft - superfiring
      12 - 6.00" / 152 mm 50.0 cal guns - 113.10lbs / 51.30kg shells, 165 per gun
	  Breech loading guns in casemate mounts, 1932 Model
	  12 x Single mounts on sides, evenly spread
      8 - 5.00" / 127 mm 40.0 cal guns - 51.70lbs / 23.45kg shells, 300 per gun
	  Dual purpose guns in deck and hoist mounts, 1932 Model
	  4 x Twin mounts on sides, evenly spread
      12 - 1.57" / 40.0 mm 62.0 cal guns - 1.98lbs / 0.90kg shells, 1,800 per gun
	  Anti-air guns in deck mounts, 1932 Model
	  6 x Twin mounts on sides, evenly spread
      24 - 0.50" / 12.7 mm 62.0 cal guns - 0.08lbs / 0.04kg shells, 2,500 per gun
	  Anti-air guns in deck mounts, 1932 Model
	  4 x 2 row quad mounts on sides, evenly spread
	  2 x 2 row quad mounts on centreline, evenly spread
      Weight of broadside 18,596 lbs / 8,435 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	11.8" / 300 mm	357.28 ft / 108.90 m	12.40 ft / 3.78 m
	Ends:	3.15" / 80 mm	364.47 ft / 111.09 m	12.40 ft / 3.78 m
	Upper:	7.87" / 200 mm	357.28 ft / 108.90 m	8.01 ft / 2.44 m
	  Main Belt covers 76 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		5.51" / 140 mm	357.28 ft / 108.90 m	28.12 ft / 8.57 m
	Beam between torpedo bulkheads 88.58 ft / 27.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	15.7" / 400 mm	7.87" / 200 mm		15.7" / 400 mm
	2nd:	7.87" / 200 mm	5.91" / 150 mm		4.72" / 120 mm
	3rd:	5.51" / 140 mm	3.15" / 80 mm		5.51" / 140 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 3.94" / 100 mm
	Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 9.06" / 230 mm, Aft 6.30" / 160 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 105,313 shp / 78,563 Kw = 27.00 kts
	Range 8,000nm at 14.00 kts
	Bunker at max displacement = 3,812 tons

Complement:
	1,430 - 1,860

Cost:
	£15.396 million / $61.584 million

Distribution of weights at normal displacement:
	Armament: 3,796 tons, 9.3 %
	   - Guns: 3,796 tons, 9.3 %
	Armour: 14,663 tons, 36.1 %
	   - Belts: 3,993 tons, 9.8 %
	   - Torpedo bulkhead: 2,049 tons, 5.0 %
	   - Armament: 4,995 tons, 12.3 %
	   - Armour Deck: 3,236 tons, 8.0 %
	   - Conning Towers: 391 tons, 1.0 %
	Machinery: 3,108 tons, 7.6 %
	Hull, fittings & equipment: 15,087 tons, 37.1 %
	Fuel, ammunition & stores: 3,990 tons, 9.8 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  71,605 lbs / 32,480 Kg = 52.0 x 14.0 " / 356 mm shells or 13.1 torpedoes
	Stability (Unstable if below 1.00): 1.15
	Metacentric height 7.1 ft / 2.2 m
	Roll period: 16.8 seconds
	Steadiness	- As gun platform (Average = 50 %): 58 %
			- Recoil effect (Restricted arc if above 1.00): 0.76
	Seaboat quality  (Average = 1.00): 1.35

Hull form characteristics:
	Hull has a flush deck,
	  a straight bulbous bow and a cruiser stern
	Block coefficient (normal/deep): 0.626 / 0.630
	Length to Beam Ratio: 6.77 : 1
	'Natural speed' for length: 26.87 kts
	Power going to wave formation at top speed: 51 %
	Trim (Max stability = 0, Max steadiness = 100): 43
	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:	25.25 %,  29.53 ft / 9.00 m,  26.25 ft / 8.00 m
	   - Forward deck:	24.75 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Aft deck:	24.75 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Quarter deck:	25.25 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Average freeboard:		26.58 ft / 8.10 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 75.3 %
		- Above water (accommodation/working, high = better): 201.6 %
	Waterplane Area: 57,667 Square feet or 5,357 Square metres
	Displacement factor (Displacement / loading): 111 %
	Structure weight / hull surface area: 210 lbs/sq ft or 1,024 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.94
		- Longitudinal: 1.68
		- Overall: 1.00
	Excellent machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Good seaboat, rides out heavy weather easily

Lead ship of the Izumo-class battleships. Converted in 1938 to an armored support carrier, serving as a precursor to HIJMS Shinano's similar conversion.