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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bell 533 ： ウィキペディア英語版 Bell 533 The Bell 533 was a research helicopter built by Bell Helicopter to explore the limits and conditions experienced by helicopter rotors at high airspeeds under contract with the United States Army during the 1960s. The helicopter was a YH-40—a pre-production version of the UH-1 Iroquois—modified and tested in several helicopter and compound helicopter configurations. The Bell 533 was referred to as the ''High Performance Helicopter'' (HPH) by the Army, and reached a top speed of 274.6 knots (316.0 mph, 508.6 km/h) in 1969, before being retired. ==Design and development== The U.S. Army began a program to study improvements to current helicopters that could be demonstrated by testing. Analyses by three helicopter companies showed that performance could be greatly improved. Bell Helicopter was one of the participants and investigated improvements to the UH-1B Iroquois. After the study, Bell submitted a proposal for the ''High Performance Helicopter''.〔TRECOM Technical Report 63-42, 1963, p. 5.〕 On 7 August 1961, the Army's Transportation Research and Engineering Command (TRECOM) awarded a contract to Bell Helicopter for a high-performance helicopter to conduct research.〔Robb, Raymond L. ("Hybrid helicopters: Compounding the quest for speed" ). ''Vertiflite''. American Helicopter Society, Summer 2006.〕 In response, Bell built the Model 533 from a YH-40-BF, one of the six pre-production UH-1.〔Pelletier, Alain J. ''Bell aircraft since 1935''. Annapolis, MD: Naval Institute Press. 1992. ISBN 978-1-55750-056-4.〕 The dynamic components of the YH-40 were updated with components designed for the UH-1B.〔 The research for the contract was split into two phases; phase one would be to determine the benefits of an overall reduction in drag, phase two would determine the benefits of auxiliary thrust.〔 The Bell 533 was flight tested in three main configurations. The first configuration was the basic YH-40 helicopter with drag reduction changes. The second configuration added a pair of jet engines for additional thrust. The third configuration added swept wings for extra lift.〔 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 533」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.