1935 IJN B-72-3

B-72-3, Japan Fast Battleship laid down 1935

Displacement:
	31,463 t light; 33,500 t standard; 37,984 t normal; 41,571 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 / 37.88 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
	  1 x 3-gun mount on centreline, aft deck forward
	  2 x 3-gun mounts on centreline, forward evenly spread
      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

   - Conning towers: Forward 12.00" / 305 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 112,600 shp / 84,000 Kw = 29.50 kts
	Range 17,815nm at 14.00 kts
	Bunker at max displacement = 8,071 tons

Complement:
	1,359 - 1,768

Cost:
	£18.172 million / $72.689 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: 14,389 tons, 37.9 %
	   - Belts: 3,141 tons, 8.3 %
	   - Torpedo bulkhead: 3,765 tons, 9.9 %
	   - Void: 555 tons, 1.5 %
	   - Armament: 2,229 tons, 5.9 %
	   - Armour Deck: 4,407 tons, 11.6 %
	   - Conning Tower: 292 tons, 0.8 %
	Machinery: 3,199 tons, 8.4 %
	Hull, fittings & equipment: 8,778 tons, 23.1 %
	Fuel, ammunition & stores: 6,520 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):
	  40,724 lbs / 18,472 Kg = 19.4 x 16.1 " / 410 mm shells or 4.2 torpedoes
	Stability (Unstable if below 1.00): 1.05
	Metacentric height 5.7 ft / 1.7 m
	Roll period: 18.0 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 / 0.497
	Length to Beam Ratio: 7.42 : 1
	'Natural speed' for length: 32.26 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): 128.9 %
	Waterplane Area: 52,763 Square feet or 4,902 Square metres
	Displacement factor (Displacement / loading): 94 %
	Structure weight / hull surface area: 201 lbs/sq ft or 983 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.90
		- Longitudinal: 1.30
		- 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

Raised Mid-deck only - dropped aft deck and fore deck are represented by 'fore deck'. Rise aft of forward break, rise forward of aft break.

Belt covers 3ft above waterline and 7ft below waterline
Upper/end belts are HTS laminate and provide protection against 6" HE and splinters
HTS tapered structural holding bulkhead behind a 4-layer void array.

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)