1935 IJN B-72-2

B-72-2, Japan Fast Battleship laid down 1935

Displacement:
	31,463 t light; 33,500 t standard; 38,000 t normal; 41,600 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(780.00 ft / 757.00 ft) x 102.00 ft x (35.50 / 37.89 ft)
	(237.74 m / 230.73 m) x 31.09 m  x (10.82 / 11.55 m)

Armament:
      9 - 16.14" / 410 mm 45.0 cal guns - 2,248.72lbs / 1,020.00kg shells, 90 per gun
	  Breech loading guns in turret on barbette mounts, 1914 Model
	  2 x 3-gun mounts on centreline, aft evenly spread
	  1 x 3-gun mount on centreline, forward deck aft
      12 - 6.10" / 155 mm 60.0 cal guns - 123.17lbs / 55.87kg shells, 150 per gun
	  Breech loading guns in deck and hoist mounts, 1935 Model
	  2 x 3-gun mounts on centreline, aft evenly spread
		2 raised mounts
	  2 x 3-gun mounts on centreline, aft evenly spread
		2 double raised mounts
      20 - 4.72" / 120 mm 45.0 cal guns - 44.75lbs / 20.30kg shells, 250 per gun
	  Dual purpose guns in deck mounts, 1935 Model
	  10 x Twin mounts on sides, evenly spread
		6 raised mounts
      40 - 0.98" / 25.0 mm 60.0 cal guns - 0.53lbs / 0.24kg shells, 1,500 per gun
	  Machine guns in deck mounts, 1935 Model
	  40 x Single mounts on sides, evenly spread
		40 double raised mounts
      Weight of broadside 22,633 lbs / 10,266 kg
      Main Torpedoes
      32 - 24.0" / 610 mm, 29.53 ft / 9.00 m torpedoes - 2.461 t each, 78.751 t total
	In 8 sets of deck mounted side rotating tubes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	12.0" / 305 mm	545.00 ft / 166.12 m	10.00 ft / 3.05 m
	Ends:	1.00" / 25 mm	212.00 ft / 64.62 m	10.00 ft / 3.05 m
	Upper:	1.00" / 25 mm	545.00 ft / 166.12 m	15.00 ft / 4.57 m
	  Main Belt covers 111 % of normal length
	  Main Belt inclined -20.00 degrees (positive = in)

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		5.00" / 127 mm	550.00 ft / 167.64 m	37.00 ft / 11.28 m
	Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Hull void:
		1.00" / 25 mm	600.00 ft / 182.88 m	25.00 ft / 7.62 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	16.0" / 406 mm	8.00" / 203 mm		12.0" / 305 mm
	2nd:	1.00" / 25 mm	1.00" / 25 mm		4.00" / 102 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 5.00" / 127 mm
	Forecastle: 2.00" / 51 mm  Quarter deck: 4.00" / 102 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 112,639 shp / 84,029 Kw = 29.50 kts
	Range 17,880nm at 14.00 kts
	Bunker at max displacement = 8,101 tons

Complement:
	1,360 - 1,769

Cost:
	£18.173 million / $72.691 million

Distribution of weights at normal displacement:
	Armament: 4,617 tons, 12.2 %
	   - Guns: 4,460 tons, 11.7 %
	   - Weapons: 158 tons, 0.4 %
	Armour: 14,336 tons, 37.7 %
	   - Belts: 3,141 tons, 8.3 %
	   - Torpedo bulkhead: 3,765 tons, 9.9 %
	   - Void: 555 tons, 1.5 %
	   - Armament: 2,467 tons, 6.5 %
	   - Armour Deck: 4,408 tons, 11.6 %
	Machinery: 3,200 tons, 8.4 %
	Hull, fittings & equipment: 8,830 tons, 23.2 %
	Fuel, ammunition & stores: 6,537 tons, 17.2 %
	Miscellaneous weights: 480 tons, 1.3 %
	   - On freeboard deck: 280 tons
	   - Above deck: 200 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  41,027 lbs / 18,610 Kg = 19.5 x 16.1 " / 410 mm shells or 4.3 torpedoes
	Stability (Unstable if below 1.00): 1.06
	Metacentric height 5.7 ft / 1.7 m
	Roll period: 17.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 71 %
			- Recoil effect (Restricted arc if above 1.00): 0.81
	Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
	Hull has raised forecastle, rise aft of midbreak, low quarterdeck ,
	  an extended bulbous bow and large transom stern
	Block coefficient (normal/deep): 0.485 / 0.498
	Length to Beam Ratio: 7.42 : 1
	'Natural speed' for length: 32.25 kts
	Power going to wave formation at top speed: 50 %
	Trim (Max stability = 0, Max steadiness = 100): 70
	Bow angle (Positive = bow angles forward): 30.00 degrees
	Stern overhang: 5.10 ft / 1.55 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	25.00 %,  31.00 ft / 9.45 m,  15.00 ft / 4.57 m
	   - Forward deck:	20.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
	   - Aft deck:	35.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
	   - Quarter deck:	20.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
	   - Average freeboard:		17.50 ft / 5.33 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 110.3 %
		- Above water (accommodation/working, high = better): 128.8 %
	Waterplane Area: 52,773 Square feet or 4,903 Square metres
	Displacement factor (Displacement / loading): 94 %
	Structure weight / hull surface area: 202 lbs/sq ft or 986 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.90
		- Longitudinal: 1.29
		- Overall: 0.93
	Caution: Hull subject to strain in open-sea
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Ship has slow, easy roll, a good, steady gun platform

41cm 3rd Year Type
15.5cm 3rd Year Type
12cm 10th Year Type
25mm AAMG Type 96

Belt covers 3ft above waterline and 7ft below waterline
Upper/end belts are HTS laminate and provide protection against 6" HE and splinters
2" No. 2 bulkhead is structural and connects to bottom of belt
1" No. 3 bulkhead is structural, forming inner layer of double hull
2" No. 5 bulkhead is structural, is inner holding bulkhead

Misc Weights Above Deck:
100t flag facilities
40t 2x rotating catapults
50t 2x heavy cranes
10t Imperial Chrysanthenum
5kg Emperor's Portrait
Misc Weights On Deck:
120t 4-plane hangar (quarterdeck)
160t 8 seaplanes (4 on cats)