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Enstrom 480
The Enstrom 480 is a small, light helicopter produced by the Enstrom Helicopter Corporation.〔Apostolo, Giorgio: ''The Illustrated Encyclopedia of Helicopters'', pages 64-65. Bonanza Books, New York, 1984. ISBN 0-517-43935-2〕
==Design and development==
In the 1980s the Enstrom Helicopter Company was producing two helicopters, both powered by horizontally-opposed piston engines. When the United States Army revealed a requirement for a turbine-powered training helicopter, the company designed a larger, turbine-powered version of its 280 Shark. The proposed unit was designated TH28 (TH for "training helicopter" derived from the 28(0), since the Army's proposal was NTH, "new training helicopter").
The Army contract effort was not successful,〔Bell Helicopter Company won the bid, with a militarized version of its 206 JetRanger. (Stephen Pope ''Enstrom 480B'', Flying, September 2011, pp. 60-65)〕 but the company effort looked promising enough that management committed to continue with a commercial version, which was introduced in 1993. Its power was provided by the C20W variant of the Rolls-Royce Model 250 turboshaft engine.
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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