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The R-4090 Cyclone 22 was an experimental radial piston engine designed and built in prototype form in the United States during the 1940s.〔 ==Design and development== During the 1940s, Wright Aeronautical Corporation was constantly in competition with Pratt & Whitney for new engine designs required for civil and military aircraft. Utilising the Wright R-3350 as a basis, Wright developed a 22 cylinder engine, using R-3350 cylinders arranged as a two-row radial engine with 11 cylinders per row.〔 The air-cooled R-4090 was rated to deliver at 2,800 rpm for take-off, from a total displacement of , with a compression ratio of 6.85:1. Improved performance was expected from the R-4090 if it was proceeded with. A two-speed single-stage supercharger helped maintain rated power to higher altitudes.〔 The core of the engine was a forged steel crankcase which enclosed the three piece two-throw crankshaft. The cylinders were arranged equally around the crankcase, with each row off-set by 16.3636.° to ensure cooling airflow. Accessories similar to other Cyclone engines were arranged around the rear face of the crankcase and a 0.333:1 planetary reduction gearbox at the front.〔 Although there are no records of failings of the R-4090, the engine was abandoned to allow development of the R-3350 Cyclone 18 series.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wright R-4090 Cyclone 22」の詳細全文を読む スポンサード リンク
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