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Northrop BT
The Northrop BT was a two-seat, single-engine monoplane dive bomber built by the Northrop Corporation for the United States Navy. At the time, Northrop was a subsidiary of the Douglas Aircraft Company.
==Design and development==
The design of the initial version began in 1935. It was powered by a Pratt and Whitney XR-1535-66 double row air-cooled radial engine and had hydraulically actuated perforated split flaps or "dive-brakes" and a landing gear that retracted backwards into fairing "trousers" beneath the wings.〔Rene J. Francillon (1990 ed), ''McDonnell Douglas Since 1920, Volume I''. Annapolis, Maryland, Naval Institute Press〕 The perforated flaps were invented to eliminate tail buffeting during diving maneuvers.〔
The next iteration of the BT, the XBT-1, was equipped with a R-1535. This aircraft was followed in 1936 by the BT-1, powered by an R-1535-94 engine. One BT-1 was modified with a fixed tricycle landing gear and was the first such aircraft to land on an aircraft carrier.
The final variant, the XBT-2, was a BT-1 modified〔 to incorporate landing gear which folded laterally into recessed wheel wells, leading edge slots, a redesigned canopy, and was powered by an Wright XR-1820-32 radial. The XBT-2 first flew on 25 April 1938 and after successful testing the Navy placed an order for 144 aircraft. In 1939 the aircraft designation was changed to the Douglas SBD-1 with the last 87 on order completed as SBD-2s. By this point, Northrop had become the El Segundo division of Douglas aircraft, hence the change.
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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