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Japan's Imperial Navy flag

Japan's Amagi class Battlecruisers

Design

The Amagi class battlecruisers were ordered in the 1919 Program (Akagi and Amagi) and 1920 Program (Atago and Takao).1,2 These were to be a part of the 8-8 Project (8 battleships / 8 battlecruisers).1,2

The Amagi class was designed by Y. Hiraga in 1919.2

Washington Treaty

Due to the agreement in the Washington Treaty the Amagi class ships had to be cancelled.1,2 The Atago and Takao were broken up while still on the stocks.1

The Amagi and Akagi were to be converted into aircraft carriers.1

Ships

IJN Amagi

  • Manufacturer: Yokosuka Navy Yard1,2
  • December 16, 1920: Laid down.2
  • February 1922: Cancelled.1
  • 1923: Conversion to aircraft carrier.1,2
  • September 1923, September 1, 19232: Destroyed in earthquake.1,2

IJN Akagi

  • Manufacturer: Kure Navy Yard1,2
  • December 6, 1920: Laid down.2
  • April 22, 1925: Launched.1,2
  • November 1923: Conversion to aircraft carrier.1
  • March 25, 1927: Completed.2

IJN Atago

  • Manufacturer: Kawasaki at Kobe1,2
  • November 22, 1921: Laid down.2
  • February 1922, February 5, 1922: Cancelled.1,2

IJN Takao

  • Manufacturer: Mitsubishi at Nagasaki1,2
  • December 19, 1921: Laid down.2
  • February 1922, February 5, 19222: Cancelled.1,2

Specifications

  Amagi class
Crew  
Displacement 40,000 tons1,2
Displacement - Loaded 47,000 tons2
Physical Characteristics  
Length 826'1, 826' 9"2
251.8 m2
Length - Water Line 820'2
250 m2
Length - Between Perpendiculars 770'1,2
234.7 m2
Beam 101'1,2
30.8 m2
Draft / Height 31'1,2
9.5 m2
Performance  
Speed 30 knots1,2
Range at 16 knots  
Armament 16" twin turrets: 51
16" L/50, 40.6 cm twin turrets: 52
5.5": 161
5.5" L/50, 14 cm: 162
Anti-Aircraft 4.7": 41
4.7 L/45, 12 cm: 42
Torpedo Tubes 24": 81
Torpedo Tubes - Above Waterline 24": 42
Torpedo Tubes - Below Waterline 24": 42
Aircraft  
Armor  
Barbettes 9" - 11"2
Belt - Main - Aft  
Belt - Main - Amidships 10"1,2
Belt - Main - Bow  
Bulkheads 10"2
Control Tower 10" - 14"1,2
Deck 4"2, 4" - 6"1
Turrets  
Turrets - Front  
Engines  
Boilers Kanpon Type RO coal fired: 82
Kanpon Type RO mixed firing: 112
Shafts 41,2
Turbines Geared1
Gijutsu Honbu2
HP 131,0002, 131,2001
Coal 2,000 tons2
Oil 4,000 tons2

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
20th Century American Military History Crucial Site