Hiro Naval Arsenal

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The Hiro Naval Arsenal (Hiro Kaigun Kōshō or Dai-Jūichi Kaigun Kōkū-shō (11th Naval Arsenal), often abbreviated as Hiroshō) at Kure (呉), Hiroshima prefecture, was a production facility for seaplanes, flying boats, and aero engines for the Imperial Japanese Navy before and during World War II. It was largely destroyed in a raid by B-29 Superfortresses on 5 May 1945.


Designed and produced:

Prototypes and experimental aircraft:

  • Hiro R-3 - flying boat, 1 example built
  • Hiro H3H - flying boat, 1 example built
  • Hiro H10H - project only, never completed[citation needed]

Aircraft designed by other manufacturers produced at Hiro:



  • Gunston, Bill (1993). World Encyclopedia of Aircraft Manufacturers. Annapolis: Naval Institute Press. p. 148.