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The Bell 214 is a medium-lift helicopter derived from Bell Helicopter's ubiquitous UH-1 Huey series. The Bell 214ST shares the same model number, but is a larger, much-modified twin-engine derivative. ==Design and development== The original development of the Model 214 was announced by Bell in 1970 under the name "Huey Plus". The first prototype was based on a Bell 205 airframe equipped with a Lycoming T53-L-702 engine of 1,900 shp.〔Taylor, John W.R., ''Jane's All The World's Aircraft 1974-75'', Jane's Yearbooks, 1974.〕 The first Bell 214A demonstration prototype followed and was evaluated in Iran during field exercises with the Imperial Iranian Armed Forces. The trial was judged successful and an order for 287 214A helicopters followed. The intention was that these aircraft would be constructed by Bell in their Dallas-Fort Worth facility and that a further 50 214As and 350 Bell 214ST helicopters would then be built in Iran. In the event, 296 214A and 39 214C variants were delivered, before the Iranian Revolution in 1979 ended the plans for Iranian production.〔Apostolo, Giorgio. ''The Illustrated Encyclopedia of Helicopters'', p. 54. Bonanza Books, New York, 1984. ISBN 0-517-43935-2.〕 Similar in size and appearance to the Bell 205 and Bell 212, the Bell 214 uses a single, more powerful Lycoming LTC4B-8 engine (2,930 shp / 2,185 kW) and upgraded rotor system giving it a high lifting capacity and good performance at high temperatures and high altitudes.〔Frawley, Gerard. ''The International Directory of Military Aircraft'', p. 34. Aerospace Publications Pty Ltd, 2002. ISBN 1-875671-55-2.〕 It can be identified by the single large exhaust duct and wide chord rotor blades without stabilizer bars. Bell offered the Bell 214B "BigLifter" for civil use.〔 It received certification in 1976. The 214B was produced until 1981. Powered by a 2,930 shp (2,183 kW) Lycoming T5508D turboshaft, it has the same rotor drive and transmission system as the 214A. The transmission is rated at 2,050 shp (1,528 kW) for take-off, with a maximum continuous power rating of 1,850 shp (1,379 kW). The BigLifter features advanced rotor hub with elastomeric bearings; an automatic flight control system with stability augmentation; and commercial avionics.〔"Bell 214". ''Jane's Helicopter Markets and Systems''. Jane's, 2007. ((online subscription article) )〕 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「Bell 214」の詳細全文を読む スポンサード リンク
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