Nakajima Sakae ( was a two-row, 14-cylinder air-cooled 栄 Prosperity) radial engine used in a number of combat aircraft of the Imperial Japanese Navy and Imperial Japanese Army before and during World War II. [1 ]
Design and development [ edit ]
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 [2 ] 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 [ edit ]
Army Type 99 975 hp Air-cooled Radial
Long Army designation for the Nakajima NK1 radial engine named Sakae.
Short Army designation for the initial production version of the Nakajima NK1 radial engine named Sakae.
Nakajima Ha35 Model 11
Nakajima Ha35 Model 12
Nakajima Ha35 Model 23 - 1,150 hp (858 kW)
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
Applications [ edit ]
Surviving engines [ edit ]
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". [3 ] [4 ]
Specifications (Sakae 21) [ edit ]
after the Kamikaze attack of 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.
Data from TAIC Manual [5 ]
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)
Overhead valve Valvetrain:
Gear driven, two speed. Supercharger:
Fuel system: 2 BBL D.D. Float Carb. automatic mixture and boost control.
Fuel type: 92 Octane
Cooling system: Air-cooled
See also [ edit ]
References [ edit ]
Bibliography [ edit ]
World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
Jane's Fighting Aircraft of World War II. London. Studio Editions Ltd, 1989. ISBN 0-517-67964-7
Peattie, Mark R.,
Sunburst: The Rise of Japanese Naval Air Power 1909-1941, Annapolis, Maryland: Naval Institute Press, 2001, ISBN 1-55750-432-6
External links [ edit ]