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Posted 11/2/2009 Printable Fact Sheet
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Thomas Morse XP-13
Thomas Morse XP-13 "Viper" side view. (U.S. Air Force photo)
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Only one XP-13 (S/N 29-453) was built. The Viper was designed for the Curtiss H-1640-1 Chieftain engine and initially flew with it. Serious cooling problems with the twin-row in-line radial engine could not be overcome, and the XP-13 was converted to the XP-13A after an engine change (Pratt & Whitney R-1340-9) and a vertical fin redesign. The XP-13 fuselage was constructed of a metal framework with a corrugated aluminum skin giving the aircraft a very unique appearance.

Type Number built/
XP-13 1 Original aircraft
XP-13A 1 (cv) XP-13 with R-1340-9 engine

Engine: Curtiss H-1640-1 Chieftain air-cooled twin-row in-line radial of 600 hp
Maximum speed: 172 mph
Service ceiling: 20,775 ft.
Length: 23 ft. 6 in.
Span: 28 ft. 0 in.
Height: 8 ft. 5 in.
Maximum weight: 3,256 lbs.

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