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The Jacobs Aircraft Engine Company was formed in 1929 in Philadelphia. Later the company moved to Pottstown, Pennsylvania〔(【引用サイトリンク】url=http://www.epa.gov/reg3hwmd/npl/PAD980229298.htm )〕 after purchasing the machine workshop of the Light Manufacturing and Foundry Company. ==Early Engines== An early product of 1931 was the Jacobs L-3, a small 51 hp 3 cylinder radial air-cooled engine. Only 44 built. By 1933, Jacobs had developed its most famous engine, the L-4 seven-cylinder radial air-cooled engine with a power rating of 225 horsepower and a displacement of 757 cubic inches (12.4 litres). It was better known as by its military designation, the R-755.〔(【引用サイトリンク】url=http://www.pilotfriend.com/aero_engines/engine_specs/jacobs.htm )〕 At the time it became known as the best producer of engines in the 200-400 horsepower range. Jacobs was the first to start making engines using forged aluminum alloy pistons, sodium-filled exhaust valves and magnesium alloy crankcases. The L-4 was used mostly on the Cessna UC-78 Bobcat, Cessna 195 and Stearman PT-18 Kaydet. Due to the tendency of the L-4 engine to vibrate heavily at low rpms it was given the nicknames ''Shakin' Jake'' and ''Shakey Jake''.〔(【引用サイトリンク】url=http://www.gruner.com/flight/appendix/classic/jacobs.htm )〕 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「Jacobs Aircraft Engine Company」の詳細全文を読む スポンサード リンク
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