Hiro H1H

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Late production H1H1 on a launching trolly.[1][2]
Role Patrol flying boat
National origin Japan
Manufacturer Hiro Naval Arsenal
First flight 1925
Retired 1938
Primary user IJN Air Service
Produced 1927–1934
Number built 65
Developed from Felixstowe F.5

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.[3]

Design and development[edit]

Following licensed production of the Felixstowe F.5 for the Imperial Japanese Navy the company developed an improved version known as the H1H or Navy Type 15. The aircraft was built with three different engine types fitted, the Navy Type 15-I with a wooden hull had longer span upper wings and the Navy Type 15-II had four-bladed propellers. The H1H remained in front line naval service through the 1930s.[1][2][3]


Variant powered by two 450hp (336kW) Lorraine W-12 engines.
Variant powered by either two 450hp (336kW) Lorraine W-12 or two 500hp (373kW) BMW VII engines.
Variant powered by two 450hp (336kW) Lorraine W-12 engines.



Specifications (H1H1)[edit]

H1H2 side elevation, all-metal hull with Dornier-type external stiffeners.[1][2]

Data from Illustrated Encyclopedia of Aircraft[3]

General characteristics

  • Length: 49 ft 7 in (15.11 m)
  • Wingspan: 75 ft 4½ in (22.97 m)
  • Height: 17 ft 0½ in (5.19 m)
  • Wing area: 1345.53 ft2 (125 m2)
  • Empty weight: 8862 lb (4020 kg)
  • Gross weight: 13448 lb (6100 kg)
  • Powerplant: 2 × Lorraine 12E 12-cylinder piston engine, 450 hp (336 kW) each


  • Maximum speed: 106 mph (170 km/h)
  • Endurance: 14 hours  30 min 


  • 2 × 7.7 mm (0.303 in) machine guns (one at bow cockpit and one midships)
  • up to 300 kg (661 lb) of bombs

See also[edit]

H1H in flight.

Related development

Aircraft of comparable role, configuration and era

Related lists



  1. ^ a b c Mikesh, Robert C.; Abe, Shorzoe (1990). Japanese Aircraft 1910-1941. Maryland 21402: Naval Institute Press Annapolis. ISBN 1-55750-563-2.CS1 maint: location (link)
  2. ^ a b c Januszewski, Tadeusz; Zalewski, Kryzysztof (2000). Japońskie samoloty marynarski 1912-1945. tiel2, Lampart. ISBN 83-86776-00-5.CS1 maint: location (link)
  3. ^ a b c Orbis 1985, p 2173


  • Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.