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:''For an overview of the whole Huey family of aircraft see Bell Huey family'' The Bell 204 and 205 are the civilian versions of the Bell UH-1 Iroquois single-engine military helicopters. They are type-certificated in the transport category and are used in a wide variety of applications, including crop dusting, cargo lifting and aerial firefighting. ==Development== Bell designed its Model 204 in response to a 1955 United States Army requirement for a utility helicopter. The 204 was a giant step forward in helicopter design, being one of the first to be powered by a turboshaft. The turboshaft engine radically improved the practicality of the helicopter due to its light weight and high power-to-weight ratio, lower fuel consumption, and lower maintenance and operating costs. The use of a turboshaft in the 204 allowed it to carry a useful payload over respectable ranges and at reasonable speeds, which resulted in the 204 and subsequent 205 becoming the most successful western helicopter series in terms of numbers built.〔Frawley, Gerard: ''The International Directory of Civil Aircraft, 2003-2004'', page 44. Aerospace Publications Pty Ltd, 2003. ISBN 1-875671-58-7〕 The civil 204B was first delivered in 1961. The subsequent Model 205A-1 is equivalent to the UH-1H, which, compared to the 204, is longer, larger, and has better performance and a more powerful engine.〔 Over 60 civil Model 204Bs had been delivered by 1967, while further examples were built by Agusta-Bell up until 1973. 12,000 Model 205s (including civil 205A-1s) were built by Bell and Agusta-Bell up to the early 1980s. Numerous ex-military 204s and 205s were converted for commercial use.〔 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 204/205」の詳細全文を読む スポンサード リンク
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