Thomas-Morse XP-13 Viper


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Thomas-Morse XP-13 Viper

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 ENGINE1 x 525hp Pratt and Whitney SR-1340-C Wasp
  Take-off weight1477 kg3256 lb
  Empty weight1026 kg2262 lb
  Wingspan8.53 m28 ft 0 in
  Length7.16 m24 ft 6 in
  Height2.56 m8 ft 5 in
  Wing area17.56 m2189.01 sq ft
  Max. speed277 km/h172 mph
  Cruise speed241 km/h150 mph
  Ceiling7361 m24150 ft
  Rate of climb508 m/min1650 ft/min
 ARMAMENTtwo machine guns

Klaatu83, e-mail, 31.10.2015 05:22

This was the last Thomas-Morse design and was actually completed after the company was taken over by Consolidated Aircraft. It was a failure, partly because Consolidated wasn't really much interested in pursuing the project, but mostly because the engine shown in the photo above, the experimental Curtiss H-1640 "Chieftain" engine, proved to be a failure, due mainly to cooling problems. That unusual engine was a 12-cylinder air-cooled unit in which two rows of six cylinders were arranged in a the shape of a hexagon. The airplane was eventually re-built with a Pratt and Whitney "Wasp" air-cooled radial engine, which improved the airplane's performance, but the Army was more interested in fighters powered by liquid-cooled engines, so no production orders were forthcoming.


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