Hiro Naval Arsenal

The Hiro Naval Arsenal (Hiro Kaigun Kosho or Dai-Jūichi Kaigun Kōkū-shō (11th Naval Arsenal), often abbreviated as Hirosho) 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.

Aircraft
Designed and produced:


 * Hiro H1H - biplane flying boat developed from the Felixstowe F.5
 * Hiro H2H - biplane flying boat developed from the Supermarine Southampton II
 * Hiro H4H - flying boat
 * Hiro G2H - long range bomber

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

Aircraft designed by other manufacturers produced at Hiro:


 * Yokosuka B3Y
 * Nakajima B5N "Kate"
 * Aichi E13A "Jake"
 * Yokosuka D4Y "Judy"

Engines
Designed and produced:


 * Hiro Type 14
 * Hiro Type 61 of 620 hp
 * Hiro Type 91 of 500 hp
 * Hiro Type 91 of 620 hp