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The Northrop XFT was an American prototype fighter aircraft of the 1930s. A single engined low-winged monoplane, it was designed and built to meet a United States Navy order for an advanced carrier based fighter. It exhibited poor handling, and was rejected by the Navy, the single prototype being lost in a crash. A variant, the Northrop 3A, also was unsuccessful. ==Development and design== In the early 1930s, the United States Navy was interested in investigating the use of modern, monoplanes as fighter aircraft to replace the biplanes that equipped its fighter squadrons. In December 1932, it ordered the XF7B from Boeing, and based on the impressive performance of Northrop's Gamma and Delta, both stressed skin monoplanes, placed an order with Northrop on May 8, 1933 for a single prototype fighter, designated XFT-1.〔Green and Swanborough 1994, pp.454-455.〕〔Francillion 1979, p.173.〕 The resulting aircraft, which was designed by a team led by Ed Heinemann resembled a scaled down Northrop Delta. It was a low-winged monoplane, of all-metal stressed skin construction. It had a fixed tailwheel undercarriage with its main gear fitted with streamlining trouser fairings. The pilot sat in an enclosed cockpit with a sliding canopy. It was powered by a single Wright R-1510 radial engine.〔 The XFT-1 first flew on January 16, 1934, being delivered to NAS Anacostia for evaluation by the Navy. While it was the fastest fighter yet tested by the U.S. Navy, its handling characteristics were poor. Although it was fitted with flaps to lower its landing speed, it was difficult to control at low speeds, and had poor forward visibility, major problems for an aircraft intended to operate off aircraft carriers. Its most serious problem, however, was its behavior when spinning, where the tail was subject to severe buffeting. In February 1934, test pilot Vance Breese landed the prototype XFT-1 without authorization at Glendale California at a Curtiss Wright Technical Institute location, and pictures of the XFT-1 were leaked to Janes AWA. It was fitted with a more powerful R-1510 engine in August 1934, but this did not improve performance, and it was returned to Northrop for more major modifications, being fitted with larger tail surfaces and a Pratt & Whitney R-1535 Twin Wasp Junior radial engine, being redesignated XFT-2.〔Francillion 1979, pp.174-175.〕 The XFT-2 was redelivered to Anacostia in April 1936,〔Francillion 1979, p.175.〕 where it was found that while its performance had only slightly improved, its handling was even poorer than before, and it was rejected by the U.S. Navy as unairworthy.〔 It was ordered to be returned to Northrop, and ignoring instructions to ship the aircraft back to Northrop's El Segundo factory, a test pilot attempted to fly the XFT-2 back to California, the aircraft entering a spin and crashing when crossing the Allegheny Mountains on July 21, 1936.〔 The design formed the basis of the Northrop 3A, almost identical to the XFT except for a retractable undercarriage, which first flew in 1935. It was another failure, having a tendency for unintentional spins. After the 3A and its test pilot, Lieutenant Frank Scare, disappeared without trace on a flight over the Pacific Ocean off California on 30 July 1935, Northrop abandoned the 3A project and sold its blueprints to Chance Vought Aviation.〔Green and Swanborough 1994, p. 455.〕〔Angelucci and Bowers 1987, p. 361.〕 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「Northrop XFT」の詳細全文を読む スポンサード リンク
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