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Japan's Imperial Navy flag

Japan's B-64/B-65 class Battlecruisers

Design

The B-64/B-65 (depending on the source) class were to be battlecruisers that were similar in appearance to the Yamato class but with 12.2" guns.1

Initial design work started in the 19393 / autumn of 1940.2 In 1941 it was decided to mount 14.2" guns in three twin turrets after the armament of the Alaska class became known.2

Two ships were ordered under the 1942 Fifth Replenishment Program but the programme was cancelled.2

Aircraft

There were to be three aircraft that would have had a catapult just aft of the funnel.1 A crane would be used to lift them back on board.1

Armament

The first of the 12.2" guns was tested in 1941.2

Ships

Hull 795

  • 1942: Cancelled.1

Hull 796

  • 1942: Cancelled.1

Specifications

  B-64/B-65 class
Crew  
Displacement 31,495 tons2, 32,000 tons1,3
Displacement - Loaded  
Physical Characteristics  
Length 802' 6"3, 807'1,2
244.6 m3, 246 m2
Length - Water Line 787' 5"3, 788'1,2
240 m2,3
Length - Between Perpendiculars  
Beam 89' 3"1,2,3
27.2 m2,3
Draft / Height 28' 9"1,2, 28' 10"3
8.8 m2,3
Performance  
Speed 33 knots1,2,3
Range at 18 knots 8,000 nautical miles2
Armament 12.2", 31 cm triple turrets: 31,2
12.2" L/50 triple turrets: 33
Anti-Aircraft 3.9" twin mounts: 81
3.9" L/65, 10 cm twin mounts: 82,3
25 mm twin mounts: 41,2
25 mm: 123
13 mm twin mounts: 21,2
13.2 mm: 83
Torpedo Tubes 24": 83
Aircraft 31,2,3
Armor  
Barbettes  
Belt - Main 7.5"1,2,3
Control Tower  
Deck 5"1,2,3
Turrets  
Turrets - Front  
Engines  
Boilers 83
Kanpon: 82
Shafts 41,2,3
Turbines Geared1,3
Kanpon2
HP 160,0001,2,3
Oil 4,476 tons2, 4,545 tons3

Sources:

  1. Japanese Warships of World War II, A. J. Watts, 1966
  2. The Imperial Japanese Navy, A. J. Watts and B. G. Gordon, 1971
  3. Conway's All the World's Fighting Ships 1922-1946, Robert Gardiner, 1987
20th Century American Military History Crucial Site