SS Sin-ai Maru (1921)

Sin-ai Maru, also known as Shin-ai Maru was a 3,794 ton transport ship of the Imperial Japanese Army during World War II.

Name: Shin-ai Maru (1921-1938)
Sin-ai Maru (1938-1943)
Owner: Kishimoto Kisen K.K.
Builder: Fujimagata Dockyard, Osaka
Launched: 1921
Fate: Sunk by aircraft on 3 March 1943 at 07°15'S, 148°30'E
General characteristics
Tonnage: 3,794 GRT
2,305 NRT
Length: 345 feet (105 m)
Beam: 50 feet (15 m)
Draught: 29 feet (8.8 m)
Installed power: 342 NHP
Propulsion: Triple expansion engines

Built by Fujimagata Dockyard, Osaka and launched in 1921 as Shin-ai Maru.[1] She was renamed Sin-ai Maru in 1938.

She left Rabaul, New Britain on 1 March 1943, as part of Operation 81, carrying a cargo of troops, equipment, fuel, landing craft and ammunition for Lae, New Guinea.[2] The convoy was attacked by aircraft of the United States Army Air Forces and Royal Australian Air Force from 2 March 1943, known as the Battle of the Bismarck Sea. Sin-ai Maru was bombed on 3 March and sank at 07°15'S., 148°30'E.
18 crew, 45 gunners and an unknown number of troops were KIA..[3]


  1. "Lloyd's Register 1942-43" (PDF). plimsollshipdata. Retrieved 14 September 2012.
  2. McAulay 1991, p. 39
  3. "Shinai Maru (+1943)". Wrecksite. Retrieved 2016-10-01.


  • McAulay, Lex (1991). Battle of the Bismarck Sea. New York: St Martins Press. ISBN 0-312-05820-9. OCLC 23082610.
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