Hiro Type 91 (engine)

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Type 91
Type W-12 water-cooled piston engine
National origin Japan
Manufacturer Hiro Naval Arsenal
Developed from 12Eb
  • This page is about an engine. For the Hiro Type 91 flying boat, see Hiro H4H

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 inspired by the Lorraine-Dietrich 12Eb Courlis. An enlarged more powerful engine, the Hiro Type 90 600 hp water-cooled W-12 had also been developed using the Lorraine 12F Courlis as inspiration, developing 600 hp.

Applications[edit]

Specifications (Type 91 500hp-1)[edit]

General characteristics

  • Type: 12-cylinder water-cooled W-block (3 banks of 4 cylinders) aircraft piston engine
  • Bore: 135 mm
  • Stroke: 160 mm
  • Displacement: 27.5 L

Components

  • Cooling system: Liquid-cooled

Performance

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

See also[edit]

Related lists

References[edit]

Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 74.