The Lockheed XPB-3, later designated XFM-2 (PB pursuit, biplace / FM fighter, multi-seat), was a proposed
American heavy
fighter aircraft
Fighter aircraft (early on also ''pursuit aircraft'') are military aircraft designed primarily for air-to-air combat. In military conflict, the role of fighter aircraft is to establish air supremacy, air superiority of the battlespace. Domina ...
, developed by the
Lockheed Corporation
The Lockheed Corporation was an American aerospace manufacturer. Lockheed was founded in 1926 and merged in 1995 with Martin Marietta to form Lockheed Martin. Its founder, Allan Lockheed, had earlier founded the similarly named but otherwise-u ...
during the mid-1930s. Intended as a heavy fighter and bomber destroyer for operation by the
United States Army Air Corps
The United States Army Air Corps (USAAC) was the aerial warfare service component of the United States Army between 1926 and 1941. After World War I, as early aviation became an increasingly important part of modern warfare, a philosophical ri ...
, it failed to win a contract for construction of a prototype, the
Bell YFM-1 Airacuda
The Bell YFM-1 Airacuda was an American heavy fighter aircraft, developed by the Bell Aircraft Corporation for the United States Army Air Corps during the mid-1930s. It was the first military aircraft produced by Bell. Originally designated th ...
being preferred.
Design and development
Given the Lockheed designation Model 11, the XFM-2 was developed in response to a United States Army Air Corps requirement for a heavy, twin-engined "bomber destroyer". Originally designated XPB-3 in the "pursuit, biplace" category, it was redesignated "XFM-2", for "fighter, multiplace" early in development. Intended to be powered by two
Allison V-1710
The Allison V-1710 aircraft engine designed and produced by the Allison Engine Company was the most common United States, US-developed V12 engine, V-12 Internal combustion engine cooling, liquid-cooled engine in service during World War II. Ve ...
supercharged
In an internal combustion engine, a supercharger compresses the intake gas, forcing more air into the engine in order to produce more power for a given displacement. It is a form of forced induction that is mechanically powered (usually by ...
engines, the aircraft was designed for an armament of two 37 mm cannons: one mounted in a nose turret and the other in a dorsal turret behind the cockpit.
The XFM-2 featured a
tricycle landing gear
Tricycle gear is a type of aircraft undercarriage, or ''landing gear'', that is arranged in a tricycle fashion. The tricycle arrangement has one or more nose wheels in a single front undercarriage and two or more main wheels slightly aft of th ...
configuration and was a mid-wing
monoplane
A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple wings.
A monoplane has inherently the highest efficiency and lowest drag of any wing con ...
of nearly
medium bomber
A medium bomber is a military bomber Fixed-wing aircraft, aircraft designed to operate with medium-sized Aerial bomb, bombloads over medium Range (aeronautics), range distances; the name serves to distinguish this type from larger heavy bombe ...
size. The
empennage
The empennage ( or ), also known as the tail or tail assembly, is a structure at the rear of an aircraft that provides stability during flight, in a way similar to the feathers on an arrow.Crane, Dale: ''Dictionary of Aeronautical Terms, third ed ...
featured a twin-tail arrangement.
[''Airpower''. March 1989. Vol. 19, no. 2, p. 16.] Although the XFM-2 design was evaluated favorably by the Air Corps, the Bell YFM-1 Airacuda was selected to fill the bomber destroyer requirement, and further work on the XFM-2 was abandoned.
[Francillon 1987, p. 161.]
See also
References
Citations
Bibliography
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{{USAF fighters
FM-002
Cancelled military aircraft projects of the United States
Mid-wing aircraft
Twin piston-engined tractor aircraft
Twin-tail aircraft
Aircraft with retractable tricycle landing gear