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Nakajima Sakae

The Nakajima Sakae (Prosperity) was a two-row, 14-cylinder air-cooled radial engine built by the Nakajima Aircraft Company andused in a number of combat aircraft of the Imperial Japanese Navy and Imperial Japanese Army before and during World War II.

Variants
Army Type 99 975 hp Air-cooled Radial
- Long Army designation for the Nakajima NK1 radial engine named Sakae.

Nakajima Ha-25
- Short Army designation for the initial production version of the
    Nakajima NK1 radial engine named Sakae.

Nakajima Ha-35
- Nakajima Ha-35 Model 11
- Nakajima Ha-35 Model 12
- Nakajima Ha-35 Model 23 - 1,150 hp (858 kW)

Nakajima Ha-105

Nakajima Ha-115
- Nakajima Ha-115-I
- Nakajima Ha-115-II

Nakajima NK1
- NK1C Sakae 12 - 925 hp (690 kW), 940 hp (701 kW) , 975 hp (727 kW)
- NK1D Sakae 11 - 970 hp (723 kW), 985 hp (735 kW)
- NK1F Sakae 21 - 1,115 hp (831 kW), 1,130 hp (843 kW)
- NK1E Sakae 31 - 1,130 hp, boosted to 1,210 hp with water-methanol injection

Specifications
General characteristics
- Type: 14-cylinder air-cooled two-row radial engine
- Bore: 130 mm (5.1 in)
- Stroke: 150 mm (5.9 in)
- Displacement: 27.9 L (1,700 in³)
- Length: 1,600 mm (63 in)
- Diameter: 1,150 mm (45 in)
- Dry weight: 590 kg (1,300 lb)

Components
- Valvetrain: Overhead valve
- Supercharger: Gear driven, two speed.
- Fuel system: 2 BBL D.D. Float Carb. automatic mixture and boost control.
- Fuel type: 92 Octane
- Cooling system: Air-cooled

Performance
- Power output: 842.64 kW (1130hp) at altitude
- Specific power: 30.2 kW/L (0.66 hp/in³)
- Compression ratio: 7:1
- Power-to-weight ratio: 1.428 kW/kg (0.869 hp/lb)

Applications

- Kawasaki Ki-48
- Mitsubishi A6M
- Mitsubishi C5M
- Nakajima B5N
- Nakajima J1N
- Nakajima Ki-43
- Nakajima Ki-115
- Kawasaki Ki-56

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

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