Hiyo Japanese Aircraft Carrier

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Aircraft Carrier Hiyo of the Imperial Japanese Navy


Japanese carrier Hiyo at anchor

Japanese aircraft carrier Hiyo at anchor.


The Japanese Aircraft Carrier Hiyo (Hiyō), was a carrier that belonged to the Hiyo-class and operated by the Imperial Japanese Navy during the World War II. The name of Hiyo (the Chinese Characters) means “Flying Hawk”.  Although she was built as an aircraft carrier with flying deck, she was initially designed as the ocean liner (“Izumo Maru”) in 1939. Before she was completed as civil ship, she was acquired by the Imperial Japanese Navy in 1941 and converted to aircraft carrier.

The full conversion  arrived late to join the Battle of Midway in 1942 but she could join the Guadalcanal Campaign with the Junyo carrier in October same year. She often operated with her aircraft squadrons disembarked. Then, they could operate from land bases. The aircraft crews were less trained for carrier operations. She was first torpedoed in 1943 and needed three months to be repaired. Later, without flying squadrons, she had to operate as troop transport, ferrying aircraft and training. During the battle of the Philippine sea in 1944, a USS submarine hit her with a  torpedo. While the torpedo did not cause too much critical damage, the  subsequent leaked gasoline vapor ignited a devastating explosion which sunk her.


Class and type: Hiyō-class aircraft carrier
Displacement: 24,150 tonnes (23,770 long tons) (standard)
Length: 220 m (721 ft 9 in) (o/a)
Beam: 26.7 m (87 ft 7 in)
Draft: 8.15 m (26 ft 9 in)
Installed power: 56,250 shp (41,950 kW)
  • 2 shafts
  • 2 geared steam turbine sets
  • 6 Kampon water-tube boilers
Speed: 25.5 knots (47.2 km/h; 29.3 mph)
Range: 11,700 nmi (21,700 km; 13,500 mi) at 18 knots (33 km/h; 21 mph)
Complement: 1,187–1,224
Sensors and
processing systems:
1 × Type 2, Mark 2, Model 1 air searchradar
  • 6 × 2 – 12.7 cm/40 Type 89 anti-aircraft guns
  • 8 × 3 – 25 mm (0.98 in) AA guns
  • Belt: 50 mm (2.0 in)
  • Deck: 25 mm (0.98 in)
Aircraft carried: 48–53

Recommended Book/Guide for the Imperial Japanese Navy Aircraft Carriers 1921-1945.


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