XP-49
Role	Fighter Type of aircraft
National origin	United States
Manufacturer	Lockheed Corporation
Designer	Clarence Johnson
First flight	11 November 1942
Status	Cancelled
Number built	1
Developed from	Lockheed P-38 Lightning

The Lockheed XP-49 (company Model 522) was an advancement on the P-38 Lightning for a fighter in response to U.S. Army Air Corps proposal 39-775. Intended to use the new 24-cylinder Pratt & Whitney X-1800 engine, this proposal, which was for an aircraft substantially similar to the P-38, was assigned the designation XP-49, while the competing Grumman Model G-46 was awarded second place and designated XP-50.

History

Ordered in October 1939 and approved on January 8, 1940, the XP-49 was to feature a pressurized cockpit and armament of two 20 mm (0.79 in) cannon and four .50 in (12.7 mm) machine guns. Two months into the contract, a decision was made to substitute the Continental XI-1430-1 (or IV-1430) for the X-1800. The XP-49, 40-3055, first flew on 11 November 1942. The prototype force-landed on 1 January 1943, when the port landing gear failed to lock down due to combined hydraulic and electrical system failures.^[1] The XP-49 next flew 16 February 1943, after repairs were made. Preliminary flight data showed performance was not sufficiently better than the production P-38, especially given the questionable future of the XI-1430 engine, to warrant disruption of the production line to introduce the new model aircraft.^{[citation needed]} Consideration of quantity production was therefore abandoned.

The aircraft was flown to Wright Field, and after various problems, further work on the XP-49 was halted, and Lockheed focused their energies on improving the P-38 instead.

Specifications (XP-49)

General characteristics

• Crew: One
• Length: 40 ft 1 in (12.2 m)
• Wingspan: 52 ft 0 in (15.8 m)
• Height: 9 ft 10 in (3.0 m)
• Wing area: 327.5 sq ft (30 m²)
• Empty weight: 15,410 lb (6,990 kg)
• Gross weight: 18,750 lb (8,505 kg)
• Powerplant: 2 × Continental XI-1430-1 inverted V-12s, 1,600 hp (1,193 kW) each

Performance

• Maximum speed: 406 mph (653 km/h, 353 kn) 15,000 ft (4,570 m)
• Range: 679 mi (1,093 km, 590 nmi)
• Rate of climb: 3,300 ft/min (16.8 m/s)

Armament

• 2 × 20 mm (.79 in) cannons
• 4 × 0.5 in (12.7 mm) machine guns