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Curtiss YP-20 was a United States Army Air Service biplane fighter project. In 1929, three Curtiss P-11 Hawks were ordered with 600 hp (447 kW) Curtiss H-1640 Chieftain engines. These proved a failure, and before completion, the third was converted to use a 9 cylinder 575 hp (429 kW) Wright Cyclone, being completed as the YP-20. Testing with the R1820 was prolonged, so the Army's intention to promptly switch to a Curtiss V-1570 Conqueror engine and redesignate the aircraft XP-22 was dropped; another P-11 was chosen for that instead. Except for the engine change and its Townend ring cowling, the YP-20 was not drastically different from the P-6 from which both it and the P-11 derived, though the YP-20 had more fin and less rudder area,〔Fitzsimons, Bernard, ed. ''Illustrated Encyclopedia of Weapons and Warfare'' (London: Phoebus, 1978), Volume 12, p.1255.〕 and featured a steerable tailwheel, rather than the original skid.〔Fitzsimons, p.1255.〕 Later, a crankcase cover, gear strut fairings, and wheel pants were added. In June 1931, the AAC held a competition to evaluate the P-6, P-12, XP-22, and YP-20. The XP-22 came out the winner, but the YP-20 was given a nose and landing gear graft from the XP-22, becoming the XP-6E (P-6E prototype). With the addition of a supercharger and an enclosed cockpit, it was tested as the XP-6F. ==Operators== ; *United States Army Air Service 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「Curtiss YP-20」の詳細全文を読む スポンサード リンク
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