Hiro Type 91

The Hiro Type 91, (full designation Hiro Type 91 520 hp water-cooled W-12), was a 12-cylinder, water-cooled, W engine developed for aircraft use by the Imperial Japanese Navy in the mid-1930s. Power was in the 450 kW (600 hp) range. Its design was derived from the Napier Lion. An enlarged more powerful engine, the Hiro Type 90 600 hp water-cooled W-12 had also been developed, producing 600 hp.

Type 91
Type W-12 water-cooled piston engine
National origin Japan
Manufacturer Hiro Naval Arsenal
Developed from 12Eb

Applications

Specifications (Type 91 500hp-1)

General characteristics

Components

  • Cooling system: Liquid-cooled

Performance

  • Power output:
  • 620 PS for takeoff
  • 520 hp for max continuous

See also

Related lists

References

  • Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 74.
  • Goodwin, Mike & Starkings, Peter (2017). Japanese Aero-Engines 1910-1945. Sandomierz, Poland: MMPBooks. ISBN 978-83-65281-32-6.
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