The USA interwar planes (1 Viewer)

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The Curtiss YP-23 was converted from P-22 s/n 32-278 with a V1570-29 Conqueror engine and an exhaust-driven General Electric F-2C turbosupercharger.



It was the last biplane delivered to the USAAC but proved obsolete compared to aircraft such as the Boeing P-26. Nevertheless Curtiss developed the design further, streamlining the installation to create a truly graceful design;



Final version (by this time designated XYP-23) removed the chin radiator and experimented with a total-loss water cooling system; it too was not a success and this rather elegant machine was surveyed at Wright Field on 6 January 1936.
 
Another design which was overtaken by the pace of aircraft design in the pre-war period, Curtiss XP-31 Swift s/n 33-178 was originally flown with a 700 hp Wright R1750 Cyclone radial engine.



It failed to live up to its name, and despite being re-engined with a less draggy Curtiss Conqueror V12, it still fell below the performance of the P-26. Nevertheless its main claim to fame was in being the Air Corps' first fighter with a fully-enclosed cockpit.



Re-delivered with Wright Field experimental prototype designation XP-934, it was declared obsolete in December 1935 and passed to the Edgewood Arsenal on 14 July 1936 where it was surveyed that December.
 

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