The Hiro H1H (or Navy Type 15) was a 1920s Japanese bomber or reconnaissance biplane flying boat developed from the Felixstowe F.5 by the Hiro Naval Arsenal for the Imperial Japanese Navy.

The aircraft were built by Hiro, the Yokosuka Naval Arsenal and Aichi.

The H1H remained in front line naval service through the 1930s.

[1][2][3] Data from Illustrated Encyclopedia of Aircraft[3]General characteristics Performance Armament

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