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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-4 ： ウィキペディア英語版 Keystone B-4 The Keystone B-4 was a biplane bomber produced for the United States Army Air Corps. ==Design and development== Originally ordered by the United States Army Air Corps as the LB-13 light bomber. When the ''LB-'' designation was dropped in 1930, the first five planes were redesignated Y1B-4. (The ''Y1B-'' designation indicates that funds for the design did not come from the normal annual funds.) The first B-3A (S/N 30-281) was converted to Y1B-4 configuration with the addition of R-1860-7 radial engines and low pressure tires. Because of more powerful engines, the performance of the Y1B-4 was a slight improvement on the B-3, but the only difference between the two planes was their engines. On April 28, 1931, the army ordered 25 improved Y1B-4s as the Keystone B-4A. This production version was part of the last biplane bomber order made by the Army Air Corps (along with 39 B-6As, identical in all respects except their make of engine), and the B-4As, delivered between January and April 1932, were the last biplane bombers delivered to the Air Corps. 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-4」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.