XP-22 Hawk
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XP-22 Hawk

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High Quality Content by WIKIPEDIA articles! The Curtiss XP-22 Hawk was an 1930s American experimental biplane fighter built by Curtiss for evaluation by the United States Army Air Service. 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 ...