Hiyo Aircraft Carrier

Converted from a commercial passenger ship, Hiyo was a fleet carrier that entered service with the Imperial Japanese Navy in early June 1942. She was the lead ship of the Hiyo-class, which was composed of only two aircraft carriers, the other being the Junyo, as both had been developed from passenger liners. In October 1942, her aircraft carried out air raids against US warships during the Guadalcanal Campaign. In April 1943, she took part in the attack on Allied bases in the Solomons Islands and New Guinea. In June 1943, she was damaged by an American torpedo attack. Having been repaired and put back to sea, she was sunk by a US Navy’s TBF Avenger torpedo bomber during the “Great Marianas Turkey Shoot on June 20, 1944.


Hiyo’s offensive weaponry consisted of 20 Mitsubishi A6M Zero fighters, 18 Aichi D3A dive bombers, and 15 Nakajima B5N torpedo bombers. For defense, she was armed with twelve 127mm (5″) Type 89 guns and twenty-four 25mm AA guns.

Power plant

She was propelled by 2 Kampon geared steam turbines, with 2 shafts and supplied by 6 Kampon water tube boilers, which delivered 57,000 hp.


Length: 220 m (240 yards)

Beam: 26.7 m (29 yards)

Draft: 8.15 m

Displacement: 25,000 tons

Speed: 25.5 knots

Range: 10,000 nautical miles

Crew: 1,200 men



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Thor is Carlos Benito Camacho, the manager and writer of this blog.