The Info List - Nakajima Sakae

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The Nakajima Sakae
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
Imperial Japanese Navy
and Imperial Japanese Army
Imperial Japanese Army
before and during World War II.[1]


1 Design and development 2 Variants 3 Applications 4 Surviving engines 5 Specifications (Sakae 21)

5.1 General characteristics 5.2 Components 5.3 Performance

6 See also 7 References

7.1 Notes 7.2 Bibliography

8 External links

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).[2] The Imperial Japanese Army
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
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. 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
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-74

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]

USS Suwannee after the Kamikaze attack of 25 October 1944. Parts of the A6M5 Kamikaze-Zero's Nakajima Sakae
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] 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)


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)

See also[edit]

Comparable engines

BMW 801 Bristol Hercules Pratt & Whitney R-1830 Wright R-2600 Fiat A.74 Gnome-Rhône 14N Mitsubishi
Kinsei Shvetsov ASh-82 Nakajima Homare

Related lists

List of aircraft engines

References[edit] Notes[edit]

^ 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


Gunston, Bill. 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]

Wikimedia Commons has media related to Nakajima Sakae.

v t e

Nakajima aircraft engines


Ha-1 Kotobuki Ha-5 Ha-8 Hikari Ha-103 Mamoru Sakae Ha-45 Homare

v t e

Imperial Japanese Army
Imperial Japanese Army
Air Service aero engine designations


Ha-1 Ha-5 Ha-6 Ha-9 Ha-25 Ha-26 Ha-35 Ha-40 Ha-44 Ha-45


Ha-60 Ha-70


Ha-101 Ha-102 Ha-103 Ha-104 Ha-105 Ha-112 Ha-115 Ha-140


Ha-201 Ha-211 Ha-214 Ha-217 Ha-505

v t e

Imperial Japanese Navy
Imperial Japanese Navy
aero engines



Hiro Naval Arsenal

Type 91 Type 94


Kasei Kinsei Shinten Zuisei


Hikari Homare Kotobuki Mamoru Sakae

Tokyo Gasu Denki