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Nakajima Sakae

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

Design and development
The engine was designed by Nakajima Aircraft Company with code name NAM, as a scaled-down and advanced version of the previous NAL design (Army Type 97 850 hp radial engine, Nakajima Ha5). The Imperial Japanese Army Air Force called the first of the series the Ha-25 (ハ25) and later versions were designated Ha35, Ha105 and Ha115, while the Imperial Japanese Navy Air Service designation was Nakajima NK1, with sub-types identified by Model numbers; thus Nakajima NK1 Sakae 10, 20 and 30 series.

A total of 21,166 were made by Nakajima; 9,067 were manufactured by other firms.

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

General characteristics: (Sakae 21)

• 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

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