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Martin T4M
The Martin T4M was an American torpedo bomber of the 1920s. A development by the Glenn L. Martin Company of their earlier Martin T3M, and like it a single-engined biplane, the T4M served as the standard torpedo bomber aboard the aircraft carriers of the United States Navy through much of the 1930s.
==Development and design==
The Martin Model 74 was designed and developed by the Glenn L. Martin Company as a result of testing of the experimental radial engined developments of the Martin T3M, the XT3M-3 and XT3M-4. The resulting prototype, designated XT4M-1, first flew in April 1927,〔Swanborough and Bowers 1976, p.311〕 and was purchased by the U.S. Navy for further evaluation.〔Grossnick 1995, p.508.〕
The XT4M-1 had new single-bay fabric covered metal wings of shorter span than the wooden wings of the T3M.〔Taylor 1981, p.93.〕 It was powered by a Pratt & Whitney Hornet, (as used by the XT3M-3), and was fitted with a revised rudder. The fuselage was similar to that of the T3M-2, and like the earlier aircraft, could be fitted with either a wheeled undercarriage or floats.
As a result of the successful trials, the U.S. Navy ordered 102 similar production aircraft from Martin as the T4M-1 on June 30, 1927.〔 Martin sold their Cleveland factory, which had built the T4M, to the Great Lakes Aircraft Company in October 1928, which resulted in Great Lakes receiving an order for 18 aircraft with slightly modified undercarriages as the TG-1.〔Swanborough and Bowers 1976, p.312〕 On 2 July 1930, the U.S. Navy placed an order for 32 aircraft powered by a more powerful Wright Cyclone radial engines with the Detroit Aircraft Corporation as the TE-1.〔 Detroit, however, passed the order to Great Lakes, which by this time was a subsidiary, and the aircraft were built as TG-2s.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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