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Tsurugi, Japanese Battleship laid down 1898
1		Tsurugi, Japanese Battleship laid down 1898
2
3		Displacement:
4		10,848 t light; 11,678 t standard; 12,500 t normal; 13,157 t full load
5
6		Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
7		(419.95 ft / 410.11 ft) x 72.18 ft x (26.25 / 27.35 ft)
8		(128.00 m / 125.00 m) x 22.00 m x (8.00 / 8.34 m)
9
10		Armament:
11		4 - 12.01" / 305 mm 40.0 cal guns - 850.98lbs / 386.00kg shells, 100 per gun
12		Breech loading guns in turret on barbette mounts, 1898 Model
13		2 x Twin mounts on centreline, evenly spread
14		8 - 9.25" / 235 mm 47.0 cal guns - 380.08lbs / 172.40kg shells, 125 per gun
15		Breech loading guns in deck and hoist mounts, 1895 Model
16		4 x Twin mounts on sides, evenly spread
17		12 - 5.98" / 152 mm 40.0 cal guns - 99.87lbs / 45.30kg shells, 200 per gun
18		Quick firing guns in casemate mounts, 1888 Model
19		12 x Single mounts on sides, evenly spread
20		10 hull mounts in casemates- Limited use in all but light seas
21		16 - 3.00" / 76.2 mm 40.0 cal guns - 12.94lbs / 5.87kg shells, 400 per gun
22		Quick firing guns in casemate mounts, 1898 Model
23		12 x Single mounts on sides, evenly spread
24		4 x Single mounts on sides, aft deck aft
25		Weight of broadside 7,850 lbs / 3,561 kg
26		Main Torpedoes
27		4 - 17.7" / 450 mm, 11.67 ft / 3.56 m torpedoes - 0.393 t each, 1.572 t total
28		submerged bow & stern tubes
29		2nd Torpedoes
30		4 - 17.7" / 450 mm, 11.67 ft / 3.56 m torpedoes - 0.393 t each, 1.572 t total
31		below water reloads
32
33		Armour:
34		- Belts: Width (max) Length (avg) Height (avg)
35		Main: 10.0" / 254 mm 298.56 ft / 91.00 m 9.84 ft / 3.00 m
36		Ends: 5.00" / 127 mm 111.55 ft / 34.00 m 3.28 ft / 1.00 m
37		Upper: 5.98" / 152 mm 298.56 ft / 91.00 m 7.55 ft / 2.30 m
38		Main Belt covers 112 % of normal length
39
40		- Torpedo Bulkhead - Strengthened structural bulkheads:
41		3.94" / 100 mm 298.56 ft / 91.00 m 24.15 ft / 7.36 m
42		Beam between torpedo bulkheads 65.62 ft / 20.00 m
43
44		- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
45		Main: 10.2" / 260 mm 5.00" / 127 mm 10.0" / 254 mm
46		2nd: 7.99" / 203 mm 3.15" / 80 mm 10.0" / 254 mm
47		3rd: 5.98" / 152 mm - 5.98" / 152 mm
48		4th: 3.94" / 100 mm - 5.00" / 127 mm
49
50		- Protected deck - single deck:
51		For and Aft decks: 1.97" / 50 mm
52		Forecastle: 0.00" / 0 mm Quarter deck: 1.97" / 50 mm
53
54		- Conning towers: Forward 9.06" / 230 mm, Aft 0.00" / 0 mm
55
56		Machinery:
57		Coal fired boilers, complex reciprocating steam engines,
58		Direct drive, 2 shafts, 12,486 ihp / 9,315 Kw = 18.00 kts
59		Range 5,000nm at 10.00 kts
60		Bunker at max displacement = 1,480 tons (100% coal)
61
62		Complement:
63		590 - 768
64
65		Cost:
66		£1.319 million / $5.277 million
67
68		Distribution of weights at normal displacement:
69		Armament: 1,464 tons, 11.7 %
70		- Guns: 1,459 tons, 11.7 %
71		- Weapons: 5 tons, 0.0 %
72		Armour: 4,737 tons, 37.9 %
73		- Belts: 1,915 tons, 15.3 %
74		- Torpedo bulkhead: 1,050 tons, 8.4 %
75		- Armament: 943 tons, 7.5 %
76		- Armour Deck: 724 tons, 5.8 %
77		- Conning Tower: 105 tons, 0.8 %
78		Machinery: 2,014 tons, 16.1 %
79		Hull, fittings & equipment: 2,632 tons, 21.1 %
80		Fuel, ammunition & stores: 1,651 tons, 13.2 %
81		Miscellaneous weights: 1 tons, 0.0 %
82		- Hull above water: 1 tons
83
84		Overall survivability and seakeeping ability:
85		Survivability (Non-critical penetrating hits needed to sink ship):
86		11,824 lbs / 5,363 Kg = 13.7 x 12.0 " / 305 mm shells or 7.2 torpedoes
87		Stability (Unstable if below 1.00): 1.37
88		Metacentric height 5.3 ft / 1.6 m
89		Roll period: 13.1 seconds
90		Steadiness - As gun platform (Average = 50 %): 70 %
91		- Recoil effect (Restricted arc if above 1.00): 0.59
92		Seaboat quality (Average = 1.00): 1.56
93
94		Hull form characteristics:
95		Hull has a flush deck,
96		a ram bow and a round stern
97		Block coefficient (normal/deep): 0.563 / 0.569
98		Length to Beam Ratio: 5.68 : 1
99		'Natural speed' for length: 20.25 kts
100		Power going to wave formation at top speed: 46 %
101		Trim (Max stability = 0, Max steadiness = 100): 45
102		Bow angle (Positive = bow angles forward): 0.00 degrees
103		Stern overhang: 0.00 ft / 0.00 m
104		Freeboard (% = length of deck as a percentage of waterline length):
105		Fore end, Aft end
106		- Forecastle: 15.00 %, 14.11 ft / 4.30 m, 14.11 ft / 4.30 m
107		- Forward deck: 35.00 %, 14.11 ft / 4.30 m, 14.11 ft / 4.30 m
108		- Aft deck: 35.00 %, 14.11 ft / 4.30 m, 14.11 ft / 4.30 m
109		- Quarter deck: 15.00 %, 14.11 ft / 4.30 m, 14.11 ft / 4.30 m
110		- Average freeboard: 14.11 ft / 4.30 m
111		Ship tends to be wet forward
112
113		Ship space, strength and comments:
114		Space - Hull below water (magazines/engines, low = better): 111.8 %
115		- Above water (accommodation/working, high = better): 95.3 %
116		Waterplane Area: 20,914 Square feet or 1,943 Square metres
117		Displacement factor (Displacement / loading): 83 %
118		Structure weight / hull surface area: 145 lbs/sq ft or 707 Kg/sq metre
119		Hull strength (Relative):
120		- Cross-sectional: 0.91
121		- Longitudinal: 2.25
122		- Overall: 1.00
123		Cramped machinery, storage, compartmentation space
124		Adequate accommodation and workspace room
125		Ship has slow, easy roll, a good, steady gun platform
126		Excellent seaboat, comfortable, can fire her guns in the heaviest weather
127
128		4 76mm guns are, in fact, directly stern mounted BUTT GUNS
129
130		Designed to form the backbone of the IJN battleline along with the Suisho-class armored cruisers