Tsurugi-class

Tsurugi, Japanese Battleship laid down 1898

Displacement:
	10,848 t light; 11,678 t standard; 12,500 t normal; 13,157 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(419.95 ft / 410.11 ft) x 72.18 ft x (26.25 / 27.35 ft)
	(128.00 m / 125.00 m) x 22.00 m  x (8.00 / 8.34 m)

Armament:
      4 - 12.01" / 305 mm 40.0 cal guns - 850.98lbs / 386.00kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1898 Model
	  2 x Twin mounts on centreline, evenly spread
      8 - 9.25" / 235 mm 47.0 cal guns - 380.08lbs / 172.40kg shells, 125 per gun
	  Breech loading guns in deck and hoist mounts, 1895 Model
	  4 x Twin mounts on sides, evenly spread
      12 - 5.98" / 152 mm 40.0 cal guns - 99.87lbs / 45.30kg shells, 200 per gun
	  Quick firing guns in casemate mounts, 1888 Model
	  12 x Single mounts on sides, evenly spread
		10 hull mounts in casemates- Limited use in all but light seas
      16 - 3.00" / 76.2 mm 40.0 cal guns - 12.94lbs / 5.87kg shells, 400 per gun
	  Quick firing guns in casemate mounts, 1898 Model
	  12 x Single mounts on sides, evenly spread
	  4 x Single mounts on sides, aft deck aft
      Weight of broadside 7,850 lbs / 3,561 kg
      Main Torpedoes
      4 - 17.7" / 450 mm, 11.67 ft / 3.56 m torpedoes - 0.393 t each, 1.572 t total
	submerged bow & stern tubes
      2nd Torpedoes
      4 - 17.7" / 450 mm, 11.67 ft / 3.56 m torpedoes - 0.393 t each, 1.572 t total
	below water reloads

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	10.0" / 254 mm	298.56 ft / 91.00 m	9.84 ft / 3.00 m
	Ends:	5.00" / 127 mm	111.55 ft / 34.00 m	3.28 ft / 1.00 m
	Upper:	5.98" / 152 mm	298.56 ft / 91.00 m	7.55 ft / 2.30 m
	  Main Belt covers 112 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		3.94" / 100 mm	298.56 ft / 91.00 m	24.15 ft / 7.36 m
	Beam between torpedo bulkheads 65.62 ft / 20.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	10.2" / 260 mm	5.00" / 127 mm		10.0" / 254 mm
	2nd:	7.99" / 203 mm	3.15" / 80 mm		10.0" / 254 mm
	3rd:	5.98" / 152 mm	      -			5.98" / 152 mm
	4th:	3.94" / 100 mm	      -			5.00" / 127 mm

   - Protected deck - single deck:
	For and Aft decks: 1.97" / 50 mm
	Forecastle: 0.00" / 0 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 9.06" / 230 mm, Aft 0.00" / 0 mm

Machinery:
	Coal fired boilers, complex reciprocating steam engines,
	Direct drive, 2 shafts, 12,486 ihp / 9,315 Kw = 18.00 kts
	Range 5,000nm at 10.00 kts
	Bunker at max displacement = 1,480 tons (100% coal)

Complement:
	590 - 768

Cost:
	£1.319 million / $5.277 million

Distribution of weights at normal displacement:
	Armament: 1,464 tons, 11.7 %
	   - Guns: 1,459 tons, 11.7 %
	   - Weapons: 5 tons, 0.0 %
	Armour: 4,737 tons, 37.9 %
	   - Belts: 1,915 tons, 15.3 %
	   - Torpedo bulkhead: 1,050 tons, 8.4 %
	   - Armament: 943 tons, 7.5 %
	   - Armour Deck: 724 tons, 5.8 %
	   - Conning Tower: 105 tons, 0.8 %
	Machinery: 2,014 tons, 16.1 %
	Hull, fittings & equipment: 2,632 tons, 21.1 %
	Fuel, ammunition & stores: 1,651 tons, 13.2 %
	Miscellaneous weights: 1 tons, 0.0 %
	   - Hull above water: 1 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  11,824 lbs / 5,363 Kg = 13.7 x 12.0 " / 305 mm shells or 7.2 torpedoes
	Stability (Unstable if below 1.00): 1.37
	Metacentric height 5.3 ft / 1.6 m
	Roll period: 13.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 70 %
			- Recoil effect (Restricted arc if above 1.00): 0.59
	Seaboat quality  (Average = 1.00): 1.56

Hull form characteristics:
	Hull has a flush deck,
	  a ram bow and a round stern
	Block coefficient (normal/deep): 0.563 / 0.569
	Length to Beam Ratio: 5.68 : 1
	'Natural speed' for length: 20.25 kts
	Power going to wave formation at top speed: 46 %
	Trim (Max stability = 0, Max steadiness = 100): 45
	Bow angle (Positive = bow angles forward): 0.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	15.00 %,  14.11 ft / 4.30 m,  14.11 ft / 4.30 m
	   - Forward deck:	35.00 %,  14.11 ft / 4.30 m,  14.11 ft / 4.30 m
	   - Aft deck:	35.00 %,  14.11 ft / 4.30 m,  14.11 ft / 4.30 m
	   - Quarter deck:	15.00 %,  14.11 ft / 4.30 m,  14.11 ft / 4.30 m
	   - Average freeboard:		14.11 ft / 4.30 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 111.8 %
		- Above water (accommodation/working, high = better): 95.3 %
	Waterplane Area: 20,914 Square feet or 1,943 Square metres
	Displacement factor (Displacement / loading): 83 %
	Structure weight / hull surface area: 145 lbs/sq ft or 707 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.91
		- Longitudinal: 2.25
		- Overall: 1.00
	Cramped machinery, storage, compartmentation space
	Adequate 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

4 76mm guns are, in fact, directly stern mounted BUTT GUNS

Designed to form the backbone of the IJN battleline along with the Suisho-class armored cruisers