Nakajima Sakae

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Nakajima Sakae engine on a Mitsubishi Zero

USS Suwannee after the Kamikaze attack from 25 October 1944. Parts of the A6M5 Kamikaze-Zero's Nakajima Sakae 21, 14-cylinder radial engine were found in the vicinity of the hit. Cylinder heads are destroyed, connecting rods and crankshaft are visible.

Nakajima's Sakae (栄, "Prosperity") was a two-row, 14-cylinder air-cooled radial engine used in Japanese aircraft during World War II. It was a designed by Nakajima after acquiring a license for the French Gnome-Rhone 14K. "Sakae" was the navy designation; the army called the first of the series the Ha-25 (ハ25) and later versions were designated Ha105, Ha115. Navy designations were NK1 Sakae 10, 20 and 30 series.

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

[edit] Variants

• NK1C Sakae 12 : 940 hp (701 kW)
• NK1F Sakae 21 : 1,130 hp (843 kW)
• NK1F Sakae 31 : 1,130 hp (843 kW)

[edit] Specifications (Sakae 21)

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 (1,703 in³)
• Length: 1,425 mm (56.1 in)
• Diameter: 1,115 mm (43.9 in)

Components

• Cooling system: Air-cooled

Performance

• Power output: 1,130 hp (843 kW)
• Specific power: 30.2 kW/L (0.66 hp/in³)

[edit] Applications

Japan

• Mitsubishi A6M
• Mitsubishi C5N
• Mitsubishi Ki-15
• Nakajima B5N
• Nakajima J1N
• Nakajima Ki-43

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