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The Nakajima Ha-5 is a twin row, 14 cylinder air-cooled radial aircraft engine built by the Japanese Nakajima Aircraft Company. The engine was a development of earlier single-row Japanese engines, the Kotobuki and Hikari, which had combined features of the Bristol Jupiter and Pratt & Whitney R-1340 Wasp designs. First introduced in a 1,000 PS prototype in 1933, about 7,000 civilian and 5,500 military Ha-5's were built during World War II. The Ha-5 had separate cam-discs for the front and rear rows of cylinders like American designs, rather than using a single, front-mounted cam-disc with long and short pushrods to operate both rows of cylinder valves. The Ha-5 was a twin-row development of the Nakajima Hikari, which was itself a development of the Nakajima Kotobuki. It spawned several improved variants, namely the Ha-41, with a two-stage supercharger, and the Ha-109, which featured a two-speed, two stage supercharger. The later Ha-219 was based on the same cylinder design, but was increased in size to 18 cylinders.
Specifications - Ha-5
General characteristics
- Type: 14-cylinder, air-cooled, two-row radial piston engine
- Bore: 146 mm (5.75 in)
- Stroke: 160 mm (6.3 in)
- Displacement: 37.5 L (2,288 in³)
- Diameter: 1,260 mm (49.6 in)
- Dry weight: 625kg (1,378 lb) (720kg Ha109)
Components
- Valvetrain: four-valve intake and exhaust pushrod-operated overhead valve system
- Supercharger: Centrifugal, 280mm impeller at 8.39:1 reduction (Ha-5 and Ha-41),
6.55:1 and 8.55:1 for Ha-109 (twin stage supercharger)
- Cooling system: Air-cooled
- Reduction gear: 0.6875:1 (11/16)
Performance
Power output:
- 890hp (663.7 kW) at 2,200 rpm at 4700m (15,490 ft) with -50mm boost (Nominal Power)
- 950hp (708.4 kW) at 2,200 rpm with +50mm boost (Takeoff Power)
- Specific power: ( to ) 0.58 hp/in³ to 1.02 hp/in³
- Compression ratio: 6.7:1
Applications
|
Ha-5: - Mitsubishi Ki-21 "Sally" - Mitsubishi Ki-30 - Mitsubishi Ki-57 |
Ha-41: - Nakajima Ki-49-I Donryu (Helen) - Nakajima Ki-44-I Shoki (Tojo) |
Ha-109: - Nakajima Ki-49-II - Nakajima Ki-44-II |
Source:
Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989.
Wikipedia.
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