Vultee XP-54

XP-54
Role	Fighter
National origin	United States
Manufacturer	Vultee Aircraft
First flight	15 January 1943
Status	Canceled
Primary user	United States Army Air Forces
Number built	2
Variants	XP-68 Tornado

The Vultee XP-54 Swoose Goose was a prototype fighter built by the Vultee Aircraft Company for the United States Army Air Forces (USAAF).

Vultee had submitted a proposal in response to a U.S. Army Air Corps request for an unusual configuration. The Vultee design won the competition, beating the Curtiss XP-55 Ascender and the Northrop XP-56 Black Bullet. Vultee designated it Model 84, a descendant of their earlier Model 78. After completing preliminary engineering and wind tunnel tests, a contract for a prototype was awarded on 8 January 1941. A second prototype was ordered on 17 March 1942. Although it appeared to be a radical design, its actual performance was lackluster and the project was subsequently canceled.

The XP-54 was designed with a pusher engine in the aft part of the fuselage. The tail was mounted rearward between two mid-wing booms, with the 12-ft propeller between them. The design included a "ducted wing section" developed by the NACA that enabled installation of cooling radiators and intercoolers in the inverted gull wing. The Pratt & Whitney X-1800 engine was initially proposed as the powerplant but after its development was discontinued, the liquid-cooled Lycoming XH-2470 was substituted.

In September 1941, the XP-54 mission was changed from low altitude to high altitude interception. Consequently, a turbo-supercharger and heavier armor had to be added, and the estimated empty weight increased from 11,500 to 18,000 lb (5,200 to 8,200 kg).

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