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Hiro H4H
The Hiro H4H (or Hiro Navy Type 91 Flying Boat) was a 1930s Japanese bomber or reconnaissance monoplane flying boat designed and built by the Hiro Naval Arsenal for the Imperial Japanese Navy.
First appearing in 1931, the H4H1 was a twin-engined, high-wing monoplane flying boat. Powered by two 500 hp (597 kW) Hiro 91-1 engines strut-mounted above the wing, it was produced by the Kawanishi company and entered service in 1933.
An improved version of the design, the H4H2, followed into production two years later. The H4H2 had redesigned twin fins and rudders and was powered by two 800 hp (597 kW) Myojo radial engines. A total of 47 aircraft of both versions were produced.
Both the H4H1 and H4H2 remained in front-line naval service through the 1930s.
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General characteristics
Performance
Armament
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Hiro H4H AI simulator
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Hiro H4H
The Hiro H4H (or Hiro Navy Type 91 Flying Boat) was a 1930s Japanese bomber or reconnaissance monoplane flying boat designed and built by the Hiro Naval Arsenal for the Imperial Japanese Navy.
First appearing in 1931, the H4H1 was a twin-engined, high-wing monoplane flying boat. Powered by two 500 hp (597 kW) Hiro 91-1 engines strut-mounted above the wing, it was produced by the Kawanishi company and entered service in 1933.
An improved version of the design, the H4H2, followed into production two years later. The H4H2 had redesigned twin fins and rudders and was powered by two 800 hp (597 kW) Myojo radial engines. A total of 47 aircraft of both versions were produced.
Both the H4H1 and H4H2 remained in front-line naval service through the 1930s.
Data from
General characteristics
Performance
Armament