| Sakae | |
|---|---|
 | |
| Nakajima Sakae engine on a Mitsubishi Zero |
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.[1]
Design and development
The engine was designed by Nakajima Aircraft Company after acquiring a license for the French Gnome-Rhone 14K. 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 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
Applications
- Kawasaki Ki-48
- Mitsubishi A6M
- Mitsubishi C5M
- Nakajima B5N
- Nakajima J1N
- Nakajima Ki-43
- Nakajima Ki-115
- Kawasaki Ki-56
Surviving engines
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".[2][3]
Specifications (Sakae 21)
USS Suwannee 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 Jane's.[4]
General characteristics
- Type: 14-cylinder air-cooled two-row radial engine
- Bore: 130 mm (5.1 in)
- Stroke: 150 mm (5.9 in)
- Displacement: 27.8 L (1,700 in³)
- Length: 1,600 mm (63 in)
- Diameter: 1,144 mm (45.0 in)
- Dry weight: 533 kg (1,175 lb)
Components
- Valvetrain: Overhead valve
- Supercharger: Gear driven, two speed.
- Fuel system: Nakajima twin choke carburettor, automatic mixture and boost control.
- Cooling system: Air-cooled
Performance
- Power output: 761 kW (1,020 hp) at 2,600 rpm at 6,400 ft (1,950 m)
- Specific power: 30.2 kW/L (0.66 hp/in³)
- Compression ratio: 7:1
- Power-to-weight ratio: 1.43 kW/kg (0.87 hp/lb)
See also
- BMW 801
- Bristol Hercules
- Wright R-2600
- Fiat A.74
- Gnome-Rhône 14N
- Mitsubishi Kinsei
- Shvetsov ASh-82
References
Notes
- ↑ Gunston 1989, p.105.
- ↑ 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. Archived from the original on December 14, 2009. http://www.youtube.com/watch?v=ZuoVlQOO4xc. Retrieved May 6, 2013.
- ↑ Jane's 1989, p.298.
Bibliography
- 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
 |
Wikimedia Commons has media related to Nakajima Sakae. |
| This page uses Creative Commons Licensed content from Wikipedia (view authors). |
