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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 Keystone B-6 ： ウィキペディア英語版 Keystone B-6 The Keystone B-6 was a biplane bomber developed for the United States Army Air Corps. ==Design and development== In 1931, the United States Army Air Corps received five working models (Y1B-6s) of the B-6 bomber. The ''Y1B-'' designation, as opposed to a ''YB-'' designation, indicates funding outside normal fiscal year procurement. Two of these were redesignations of LB-13s; three were re-engined B-3As. The Air Corps placed an order for 39 production models on 28 April 1931, with deliveries between August 1931 and January 1932.〔Baugher, Joe. ("Keystone B-6." ) ''American Military Aircraft,'' 11 July 1999. Retrieved: 29 July 2011.〕 At the same time, an order was placed for 25 B-4As, the same aircraft but mounting Pratt & Whitney engines instead of Wright Cyclones. Despite their lower sequence number, the B-4As would be delivered last. These were the last canvas-and-wood biplane bombers ordered by the Air Corps. The performance of the B-6A varied little from the Martin NBS-1 ordered in 1921. Its successor, the monoplane bomber, had a hard time getting accepted. The Douglas Y1B-7 and Fokker XB-8 were originally designed as high-speed reconnaissance aircraft.〔 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「Keystone B-6」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.