One of the last designs of the Thomas-Morse Aircraft Corporation of Ithaca, New York, the P-13 Viper fighter had pretty good performance and handling, but the Curtiss H-1640 Chieftain engine seen installed here had cooling problems that were never resolved. Prototype fitted with a Pratt & Whitney R-1340 Wasp as P-13A by September 1930 but no production. Aircraft lost at Wright Field on 1 October 1930 after catching fire in flight. Photo from: San Diego Air & Space Museum