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__NOTOC__ The Martin BM was a 1930s American torpedo bomber built by the Glenn L. Martin Company for the United States Navy. ==Design and development== To meet the requirement for a special-purpose dive bomber for the United States Navy and United States Marine Corps the US Navy's Bureau of Aeronautics designed a biplane with fixed tailwheel landing gear and designated Bureau Design 77. It had room for two crew in tandem. Two prototypes were ordered in June 1928, one from Martin (designated the XT5M-1) and one from the Naval Aircraft Factory (designated the XT2N-1). The Martin XT5M-1 was powered by a 525 hp (391 kW) Pratt & Whitney R-1690-22 Hornet radial engine and following test during 1930, the Navy ordered 12 aircraft from Martin with the designation BM-1. The BM-1 had a more powerful R-1690-44 engine. A further order for four was followed by an order for 16 for the BM-2. Martin moved to a new factory at Baltimore, Maryland where the XT5M-1 was built, it was first flown on 17 May 1929. During testing the aircraft suffered structural damage during a pull-out from a dive and had to be returned to the factory. After a redesign and rebuilding of the wings the XTM5-1 was handed over to the Navy in May 1930 for service trials. In April 1931 the Navy ordered 16 production aircraft to be designated the BM-1, another 16 were ordered in October 1931 as the BM-2, it was a variant with minor improvements. The prototype was flown aboard the ''Langley'' from November 1931 to prove it suitability as a carrier 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「Martin BM」の詳細全文を読む スポンサード リンク
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