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Lycoming H-2470
The Lycoming H-2470 was an H engine for aircraft designed and developed by Lycoming Engines in the 1930s. Although the engine was flown in an aircraft, it was not fitted to any aircraft selected for production. It was derived from the Lycoming O-1230 engine.
==Design and development==
In 1932, the engineers at Lycoming Engines became aware that the United States Army Air Corps (USAAC) wanted a high performance engine that could produce at least one horsepower per cubic inch (46 kW/L) of engine displacement.〔White p 379〕 Determined to become known as a high performance engine manufacturer, Lycoming began an experimental, high-performance engine of its own. After spending US $500,000, and after many attempts to develop a successful engine, it finally came close to the USAAC specifications with the O-1230 engine, which was a 12-cylinder liquid-cooled horizontally-opposed low-profile piston engine.〔White p 380〕 In 1936, the single-cylinder development tests exceeded expectations, passing its 50 hour test requirement. The full-size engine was ready for testing in 1937, and was rated at 1,000 hp. Continued development of the O-1230 reached its peak when the engine was rated at over 1,200 hp (895 kW). The O-1230 was not well received by aircraft manufacturers, because it was not very reliable at that power setting.〔
It was apparent that the O-1230 engine was uncompetitive with the high performance air-cooled engines that were then becoming available. The US Navy began funding the development of the Lycoming engine.〔Balzer p 24〕 The funding enabled Lycoming's engineers to attempt rescuing the design by proposing a 24-cylinder H-configuration engine made by stacking two of the O-1230 engines, gearing them together to one common output shaft. The new engine was the H-2470. It weighed in at 2,430 pounds and produced 2,300 hp (1,700 kW) at 3,300 rpm.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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