Curtiss XP-46. The Curtiss XP-46 was a 1940s American prototype fighter aircraft. It was a development of the Curtiss-Wright Corporation in an effort to introduce the best features found in European fighter aircraft in 1939 into a fighter aircraft which could succeed the Curtiss P-40, then in production.

Design and development
A United States Army Air Corps (USAAC) specification based upon a Curtiss proposal was the basis for an order placed in September 1939 for the XP-46. The requirements called for a single-engine, low-wing aircraft, slightly smaller than the P-40, and with a wide-track, inward-retracting landing gear. The selected powerplant was a 1,150 hp (858 kW) Allison V-1710-39 V-12 engine. The planned armament included two .50 in (12.7 mm) synchronized machine guns in the forward fuselage and provisions for eight .30 in (7.62 mm) wing-mounted guns. The USAAC later added requirements for self-sealing fuel tanks and 65 lb (29 kg) of armor, the weights of which adversely affected performance.

Testing
In 1940 the British Purchasing Commission placed an order for the P-46 as a replacement for the P-40, the British service name 'Kittyhawk' was allocated by the Air Ministry in anticipation of receiving the aircraft.

However, the USAAC asked Curtiss in July 1940 – while the XP-46 prototypes were under construction – to prioritize an upgraded P-40, featuring the engine intended for the XP-46. This would also avoid disruptions to the production line caused by any switch to a new airframe. The British order for the P-46 was later cancelled, and the 'Kittyhawk' name subsequently applied to the upgraded P-40.

Two prototypes, designated XP-46A, were nevertheless delivered to the USAAC; the first flight occurred on 15 February 1941. The type's performance during trials was found to be inferior to the then-contemporary P-40D. As the P-46 offered no significant improvement on the P-40, the program was cancelled. 

A myth claims that work on the XP-46 was the basis of the North American NA-73X – the prototype P-51 Mustang. While North American Aviation (NAA) purchased technical aerodynamic data on the P-40 and XP-46 from Curtiss for $56,000, and there are certain design similarities in the radiator/oil-cooler configuration of the two types, North American had already made significant progress on its design.

Specifications (Curtiss XP-46A)

See also
 Curtiss P-40
 Curtiss XP-42 - an earlier design also intended to replace the P-40, but not put into production
 North American P-51 Mustang
 Curtiss P-60 – a series of designs developed from the XP-46

References

Notes

Bibliography

 Berliner, Don. Surviving Fighter Aircraft of World War Two: Fighters. London: Pen & Sword Aviation, 2011. .
 Bowers, Peter M. Curtiss Aircraft, 1907-1947. London: Putnam & Company Ltd., 1979. .
 Green, William. War Planes of the Second World War, Volume Four: Fighters. London: MacDonald & Co. (Publishers) Ltd., 1961 (Sixth impression 1969). .
 Green, William and Gordon Swanborough. WW2 Aircraft Fact Files: US Army Air Force Fighters, Part 1. London: Macdonald and Jane's Publishers Ltd., 1977. .

External links

 Curtiss XP-46

Curtiss P-46
P-46
Single-engined tractor aircraft
Low-wing aircraft
Aircraft first flown in 1941
Aircraft with retractable conventional landing gear
Single-engined piston aircraft