Curtiss YP-20
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Curtiss YP-20

During 1928, the 600hp Curtiss H-1640 Chieftain 12- cylinder air-cooled radial appeared to show promise as a fighter power plant, and Curtiss was assigned the task of mating this engine to the P-6 airframe. A USAAC contract was placed for three aircraft which were designated P-11s. In the event, the Chieftain proved unsatisfactory and the P-11 was abandoned (together with the projected Curtiss XP-14 that had been designed around this engine). Two of the airframes that had been ordered in January 1929 were completed as P-6Ds and the third, which was fitted with a 575hp Wright R-1820-9 Cyclone, was assigned the designation YP-20 on delivery in October 1930. It was later fitted with the V-1570 engine of the XP-22, complete with cowling, the cantilever main undercarriage members and three-blade propeller of this aircraft to become the XP-6E.

    Take-off weight1466 kg3232 lb
    Empty weight1124 kg2478 lb
    Wingspan9.60 m32 ft 6 in
    Length7.24 m24 ft 9 in
    Height2.79 m9 ft 2 in
    Wing area23.41 m2251.98 sq ft
    Max. speed301 km/h187 mph

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