The Nakajima Homare (誉, "praise" or, more usually, "honour") was a Japanese aircraft engine manufactured during World War II. For a topic outline on this subject see List of basic Japan topics. World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including It was an air-cooled radial engine in the 2000-HP class, and was used widely by both the Imperial Japanese Army and the Imperial Japanese Navy. The radial engine is a reciprocating type internal combustion Engine configuration in which the cylinders point outward from a central The Imperial Japanese Army ( IJA) ( Kyūjitai: 大日本帝國陸軍 Shinjitai: ja 大日本帝国陸軍 Romaji: Dai-Nippon Teikoku For Combined Fleet, please see that article For Carrier Striking Task Force, please see that article "Homare" was the navy service designation, and their experimental designation for it was NK9; the army called it the Ha-45 (ハ45) or, in service, the 1900hp Type 4. The manufacturer's designation was BA (or NBA).
Development of the 18 cylinder twin-row Homare started in 1940, and certification was completed in 1941. Year 1940 ( MCMXL) was a Leap year starting on Monday (link will display the full 1940 calendar of the Gregorian calendar. It succeeded Nakajima's previous 14 cylinder Sakae (Ha-25) engine, with its forward nine cylinders staggered from the rear nine for efficient cooling. WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout
The design was exceptionally compact, with an external diameter of 118 cm, a mere 3 cm larger than the Sakae. With a bore and stroke of 130 mm x 150 mm, it was classified as a short-stroke engine. It was designed to output around 1800 hp (1340 kW), or 100 hp (75 kW)per cylinder. However, the tight design of the engine made it difficult to maintain quality in manufacturing, and unreliability in the field was a significant problem; actual output of early models at altitude was in the range of 1300 hp (970 kW), far below the designed capability. Later models had improved performance, and it became one of the predominant powerplants of Japanese military aircraft in the latter part of the war. A total of 8,747 were produced.
Specifications (Homare)
General characteristics
- Type: 18-cylinder air-cooled two-row radial engine
- Bore: 130 mm (5. The radial engine is a reciprocating type internal combustion Engine configuration in which the cylinders point outward from a central 1 in)
- Stroke: 150 mm (5. 9 in)
- Displacement: 35. 8 L (2,185 in³)
- Diameter: 1,180 mm (46. 5 in)
- Dry weight: 830 kg (1,830 lb)
Components
- Fuel system: Water-methanol injection
- Cooling system: Air-cooled
Performance
- Power output: 1,485 kW (1,990 hp) at altitude
- Specific power: 41. In Engineering, the term specific power can refer to power either per unit of Mass, Volume or Area, although power per unit of 5 kW/L (0. 91 hp/in³)
- Power-to-weight ratio: 1. Power-to-weight ratio (specific power is a calculation commonly applied to Engines and other mobile power sources to enable the comparison of one unit or design to another 79 kW/kg (1. 09 hp/lb)
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