|Nakajima Sakae engine on a Mitsubishi Zero|
|Type||Piston aircraft engine|
|Major applications||Mitsubishi A6M|
|Developed from||Nakajima Ha5|
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.
- Army Type 99 975 hp Air-cooled Radial
- Long Army designation for the Nakajima NK1 radial engine named Sakae.
- Nakajima Ha25
- Short Army designation for the initial production version of the Nakajima NK1 radial engine named Sakae.
- Nakajima Ha35
- Nakajima Ha35 Model 11
- Nakajima Ha35 Model 12
- Nakajima Ha35 Model 23 - 1,150 hp (858 kW)
- Nakajima Ha105
- Nakajima Ha115
- Nakajima Ha115-I
- Nakajima Ha115-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 (843 kW) , boosted to 1,210 hp (902 kW) with water-methanol injection
- Kawasaki Ki-45 (prototype)
- Kawasaki Ki-48
- Kawasaki Ki-56
- Mitsubishi A6M
- Mitsubishi C5M2
- Nakajima B5N2
- Nakajima J1N
- Nakajima Ki-43
- Nakajima Ki-115
- Tachikawa Ki-77
A small number of original Sakae powerplants are on display in aviation museums, usually mounted into the airframes of restored Mitsubishi A6M Zeros - only one airworthy Zero worldwide still flies with a restored Sakae powerplant, the Planes of Fame Museum's A6M5 example, bearing tail number "61-120".
Specifications (Sakae 21)
Data from TAIC Manual 
- 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)
- 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
- 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)
- BMW 801
- Bristol Hercules
- Pratt & Whitney R-1830
- Wright R-2600
- Fiat A.74
- Gnome-Rhône 14N
- Mitsubishi Kinsei
- Shvetsov ASh-82
- Nakajima Homare
- Gunston 1989, p.105.
- Nakagawa, Ryōichi (1985). Engine History of Nakajima Aircraft. Tōkyō: Kantōsha. pp. 76–85. ISBN 4-87357-007-7.
- Seaman, Richard. "Aircraft air shows." richard-seaman.com. Retrieved: 13 October 2010.
- Flight Demo of Genuine Japanese Zero with ORIGINAL WWII Sakae 31 Engine!. YouTube. 2009. Event occurs at 2:10. Archived from the original on December 14, 2009. Retrieved May 6, 2013.
- OPNAV-16-VT#301, p. 852
- Peattie, Mark R., Sunburst: The Rise of Japanese Naval Air Power 1909-1941, Annapolis, Maryland: Naval Institute Press, 2001, ISBN 1-55750-432-6
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