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
- Aichi E10A
- Aichi E11A
- Hiro H4H
- Kawanishi E7K
- Mitsubishi Ka-9
Specifications (Type 91 500hp-1)
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
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References
Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 74.
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