Hiro Type 91

This article is about the engine. For the Hiro Type 91 flying boat, see Hiro H4H.

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

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 had also been developed, producing 600 hp.

Applications

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

References

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

Hiro Naval Arsenal

Aircraft designed and produced by Hiro	H1H H2H H4H G2H

Prototypes and experimental aircraft	R-3 H3H H10H

Aircraft designed by others produced at Hiro	Yokosuka B3Y Nakajima B5N "Kate" Aichi E13A "Jake" Yokosuka D4Y "Judy"

Engines designed and produced by Hiro	Type 14 Type 61 Type 91 Type 94

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