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Curtiss XP-22 Hawk
The Curtiss XP-22 Hawk was an 1930s American experimental biplane fighter built by Curtiss for evaluation by the United States Army Air Service.
==Design and development==
In 1929, the AAC ordered three P-11 Hawks for testing of the 600 hp (447 kW) H-1640 Chieftain engine. This engine proved a failure, and before completion, one of the three was converted to use a 9-cylinder 575 hp (429 kW) Cyclone, being completed as the YP-20. Testing with the R-1820 was prolonged, so the Army acquired another of the three P-11s, instead. This became the XP-22.
A number of changes were made for installing the 700 hp (520 kW) Curtiss V-1570 Conqueror engine. The radiator was relocated, a new cowl was fitted, and the tail was given more fin and less rudder area,and featured a steerable tailwheel, rather than the original skid. For these changes, Curtiss charged only US$1.〔Fitzsimons 1978, p. 1255.〕
During testing, the XP-22 underwent a number of alterations and improvements, including a change from a three-strut landing gear to a single streamlined strut, later fitted with wheel pants. Fillets were added where struts joined the wing and the tail was briefly reduced in area, to P-6 standard.〔 The XP-22 was also the Army's first fighter capable of 200 mph (320 km/h), achieving 202 mph (325 km/h).〔Jones 1975, p. 58.〕
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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