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Career (Japan)
Name: Yamashio Maru
Operator: Imperial Japanese Army
Builder: Mitsubishi, Yokohama
Laid down: 19 July 1944
Launched: 14 November 1944
Commissioned: 27 January 1945
Fate: Sank by US Aircraft 17 February 1945
General characteristics
Type: Aircraft Carrier
Displacement: 11,800 t standard
Length: 148 m (516 ft 6 in)oa
Beam: 20.40 m (66 ft 11 in)
Draught: 9.00 m (29 ft 6 in)
Propulsion: 1-shaft Steam turbine, 4,500 shp
Speed: 15 knots
Range: 9,000 NM at 13 knots
Crew: 221
Armament: 16 25 mm AA, 120 Depth Charges
Aircraft carried: 8 aircraft

Yamashio Maru[1] (山汐丸?) was a Japanese escort carrier of the Second World War converted from a merchant tanker for use by the Imperial Japanese Army. It was sunk by American aircraft before it could be operationally used as a carrier.


[hide] *1 Construction


In 1944, the Japanese Army, had already converted two passenger liners into combined assault ship and aircraft carriers, when it decided to acquire its own escort carriers to provide air cover for Troop convoys. It therefore chartered two partly built Type 2TL Tankers, the Yamashio Maru (being built by Mitsubishi at Yokohama) and the Chigusa Maru, for conversion to basic auxiliary escort carriers.[2]

The conversion was extremely simple, with a 107 m (410 ft) long flush flight deck added. There was no hangar, the ship's eight Ki-76s being stored on deck. Defensive armament consisted of sixteen 25 mm anti aircraft guns, with a depth charge projector forward.[3]

Operational historyEdit

Yamashio Maru commissioned on 27 January 1945, was sunk by US aircraft 21 days later, on 17 February 1945.[3] Plans were drawn up for conversion to a coal burning freighter,[2] but she was never used as a carrier. Her sister ships, Chigusa Maru and Zuiun Maru, were incomplete when Japan surrendered and served as Tankers postwar.[3]


  • [1]Chigusa Maru postwar (2nd sister)
  • [2]Zuiun Maru postwar (3rd sister)


  1. ^ Beilstein and Fukui, p97
  2. ^ a b Gardiner and Chesneau 1980, p.213.
  3. ^ a b c Chesneau 1998, p.186.


  • Chesneau, Roger. Aircraft Carriers of the World, 1914 to the Present: An Illustrated Encyclopedia. London:Brockhampton Press, 1998. ISBN 1-86019-875-9.
  • Gardiner, Robert and Chesneau, Roger (editors). Conway's All The World's Fighting Warships 1922–1946. London:Conway Maritime Press, 1980. ISBN 0-85177-146-7.
  • Christian W. Beilstein (Author), Shizuo Fukui (Compiler). Japanese Naval Vessels at the End of World War II. US Naval Institute Press, 1992. ISBN 1-85367-125-8.

External linksEdit

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