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 had also been developed, producing 600 hp.
|Type||W-12 water-cooled piston engine|
|Manufacturer||Hiro Naval Arsenal|
Specifications (Type 91 500hp-1)
- 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
- Cooling system: Liquid-cooled
- Power output:
- 620 PS for takeoff
- 520 hp for max continuous
Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 74.