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Nakajima Homare

The Nakajima Homare (praise or honour) was an air-cooled twin-row 18 cylinder radial Japanese aircraft engine manufactured by the Nakajima Aircraft Company. Producing almost 2,000 horsepower, it was used widely by both the Imperial Japanese Army and the Imperial Japanese Navy. Given the Navy service designation NK9, the "Homare" was also given the company designation NBA, Army experimental designation Ha-45 or, Army long designation Nakajima Army Type 4 1,900 hp Air-Cooled Radial and, (coincidentally), unified designation code of Ha-45.

Variants
- Homare 11 - 1,650 hp (1,230 kW), 1,820 hp (1,357 kW), 1,900 hp (1,417 kW)
- Homare 12 - 1,825 hp (1,361 kW)
- Homare 21 - 2,000 hp (1,491 kW)
- Homare 23 - 2,000 hp (1,491 kW)

Specifications
General characteristics
- Type: 18-cylinder air-cooled twin-row radial engine
- Bore: 130 mm (5.12 in)
- Stroke: 150 mm (5.91 in)
- Displacement: 35.8 L (2187 in³)
- Length: 1,778 mm (70 in)
- Diameter: 1,180 mm (46.5 in)
- Dry weight: 810 kg (1,785 lb)

Components
- Valvetrain: push rod operated overhead-valve system with 2 valves per cylinder
- Supercharger: Two-speed single stage centrifugal
- Fuel system: 2 BBL. D.D. Float Carb.
- Fuel type: 92 Octane + ADI
- Cooling system: Air-cooled

Performance
- Power output: 1,485 kW (1,990 hp) at altitude
- Specific power: 38,57 kW/L (0.91 hp/in³)
- Compression ratio: 8.0
- Power-to-weight ratio: 1.83 kW/kg (1,11 hp/lb)

Applications

- Aichi B7A
- Kawanishi N1K-J
- Mitsubishi A7M
- Nakajima C6N
- Nakajima G8N
- Nakajima Ki-84
- Yokosuka P1Y1

Source:
Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989.
Wikipedia.

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