The Curtiss XP-31 Swift (Wright Field Project Number XP-934) was a 1930s American experimental monoplanefighter built by Curtiss for the United States Army Air Corps.
The XP-31 featured the first enclosed cockpit on a U.S. pursuit aircraft and was also the last pursuit aircraft to have fixed landing gear and externally braced wings. Despite its innovations, the XP-31 did not offer any advantages compared to its rival the Boeing P-26 Peashooter and was not ordered into series production.
Design and development
Curtiss offered the XP-31 (given the Wright Field Project Number XP-934) in a 1932 competition with the P-26. It was a low-wing monoplane with fixed landing gear, first flown in July. It was the AAC's first single-seat closed-cockpit fighter, and the last with fixed gear and wing struts. Despite its small size, it was badly overweight, and carried 125gallons (104imp gal, 474L) of fuel. Although Curtiss considered the design significant in that it introduced various new technologies, compared to its contemporaries the XP-31 was already outmoded, and, more importantly, testing showed that it fell below performance expectations.[2]
Testing and evaluation
The Curtiss XP-934 in its original radial engine configurationSide view of the XP-31's original configuration
Powered by a 700hp (520kW) R-1750 Cyclone radial, its performance was dismal, despite retractable leading edge slots and large trailing-edge flaps, so a 600hp (450kW) CurtissV-1570 Conqueror was substituted. In this form, the Curtiss XP-31 Swift (s/n 33-178) was delivered on 1 March 1933, having already lost to the P-26. The sole example was scrapped in 1935.[2]
Operators
United States
United States Army Air Corps
Specifications
Data fromU.S. Fighters: Army-Air Force 1925 to 1980s[3] and Fighters of the United States Air Force[2]
General characteristics
Crew: one pilot
Length: 26ft 3in (8.0m)
Wingspan: 36ft 0in (11m)
Height: 7ft 9in (2.4m)
Wing area: 203sqft (18.86m2)
Empty weight: 3,334lb (1,512kg)
Gross weight: 4,143lb (1,879kg)
Powerplant: 1 × Curtiss V-1570 Conqueror water-cooled 12-cylinder vee engine , 600 hp (450 kW)
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