CLV Tone

JS Tone, JMSDF Aviation Cruiser laid down 1950

Displacement:
	25,698 t light; 26,412 t standard; 28,478 t normal; 30,130 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(807.73 ft / 787.40 ft) x 98.43 ft x (26.25 / 27.38 ft)
	(246.20 m / 240.00 m) x 30.00 m  x (8.00 / 8.34 m)

Armament:
      6 - 6.10" / 155 mm 50.0 cal guns - 123.17lbs / 55.87kg shells, 130 per gun
	  Dual purpose guns in turret on barbette mounts, 1950 Model
	  3 x 2-gun mounts on centreline, forward deck forward
		1 raised mount - superfiring
      12 - 3.94" / 100 mm 65.0 cal guns - 28.66lbs / 13.00kg shells, 200 per gun
	  Dual purpose guns in turret on barbette mounts, 1950 Model
	  4 x Twin mounts on sides, forward deck aft
		2 raised mounts - superfiring
	  2 x Twin mounts on sides, aft deck forward
      24 - 1.57" / 40.0 mm 56.3 cal guns - 1.98lbs / 0.90kg shells, 2,000 per gun
	  Anti-air guns in deck mounts, 1950 Model
	  2 x Quad mounts on sides, forward deck aft
	  4 x Quad mounts on sides, aft deck forward
		2 double raised mounts - superfiring
      Weight of broadside 1,130 lbs / 513 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	5.00" / 127 mm	362.20 ft / 110.40 m	11.91 ft / 3.63 m
	Ends:	1.57" / 40 mm	425.16 ft / 129.59 m	11.91 ft / 3.63 m
	Upper:	3.94" / 100 mm	362.20 ft / 110.40 m	8.01 ft / 2.44 m
	  Main Belt covers 71 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		6.10" / 155 mm	362.20 ft / 110.40 m	22.83 ft / 6.96 m
	Beam between torpedo bulkheads 91.86 ft / 28.00 m

   - Hull void:
		0.00" / 0 mm	  0.00 ft / 0.00 m	0.00 ft / 0.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	13.4" / 340 mm	7.09" / 180 mm		13.4" / 340 mm
	2nd:	6.10" / 155 mm	2.36" / 60 mm		6.10" / 155 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 1.38" / 35 mm
	Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 6.10" / 155 mm, Aft 5.00" / 127 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 180,007 shp / 134,285 Kw = 33.60 kts
	Range 10,000nm at 15.00 kts
	Bunker at max displacement = 3,718 tons

Complement:
	1,095 - 1,424

Cost:
	£12.813 million / $51.251 million

Distribution of weights at normal displacement:
	Armament: 406 tons, 1.4 %
	   - Guns: 406 tons, 1.4 %
	Armour: 6,344 tons, 22.3 %
	   - Belts: 1,784 tons, 6.3 %
	   - Torpedo bulkhead: 1,867 tons, 6.6 %
	   - Armament: 1,290 tons, 4.5 %
	   - Armour Deck: 1,179 tons, 4.1 %
	   - Conning Towers: 223 tons, 0.8 %
	Machinery: 4,306 tons, 15.1 %
	Hull, fittings & equipment: 9,957 tons, 35.0 %
	Fuel, ammunition & stores: 2,780 tons, 9.8 %
	Miscellaneous weights: 4,685 tons, 16.5 %
	   - Hull below water: 1,500 tons
	   - Hull void weights: 500 tons
	   - Hull above water: 1,500 tons
	   - On freeboard deck: 1,000 tons
	   - Above deck: 185 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  56,333 lbs / 25,552 Kg = 495.8 x 6.1 " / 155 mm shells or 10.0 torpedoes
	Stability (Unstable if below 1.00): 1.24
	Metacentric height 7.2 ft / 2.2 m
	Roll period: 15.4 seconds
	Steadiness	- As gun platform (Average = 50 %): 70 %
			- Recoil effect (Restricted arc if above 1.00): 0.07
	Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
	Hull has a flush deck,
	  a straight bulbous bow and a cruiser stern
	Block coefficient (normal/deep): 0.490 / 0.497
	Length to Beam Ratio: 8.00 : 1
	'Natural speed' for length: 28.06 kts
	Power going to wave formation at top speed: 54 %
	Trim (Max stability = 0, Max steadiness = 100): 55
	Bow angle (Positive = bow angles forward): 30.00 degrees
	Stern overhang: 3.28 ft / 1.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	27.00 %,  29.53 ft / 9.00 m,  26.25 ft / 8.00 m
	   - Forward deck:	23.00 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Aft deck:	23.00 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Quarter deck:	27.00 %,  26.25 ft / 8.00 m,  26.25 ft / 8.00 m
	   - Average freeboard:		26.60 ft / 8.11 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 70.7 %
		- Above water (accommodation/working, high = better): 233.6 %
	Waterplane Area: 51,172 Square feet or 4,754 Square metres
	Displacement factor (Displacement / loading): 136 %
	Structure weight / hull surface area: 138 lbs/sq ft or 671 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.98
		- Longitudinal: 1.25
		- Overall: 1.00
	Excellent machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Ship has slow, easy roll, a good, steady gun platform
	Good seaboat, rides out heavy weather easily

JMSDF helicopter carrying light cruiser.