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The Bell XP-52 and subsequent XP-59 were World War II fighter aircraft design projects by the American Bell Aircraft Corporation.

Both projects featured a twin-boom layout with a rear-mounted engine driving pusher contra-rotating propellers.

When the XP-59 project was canceled the designation XP-59A was used as a cover for a secret jet fighter prototype, which would enter production as the P-59 Airacomet.

XP-52

thumb|The intended engine – the Continental X-1430 in the [[National Museum of the United States Air Force]]

The XP-52 design was begun by the Bell Company in 1940, separate from the R-40C competition, under the Air Material Command designator MX-3.

The short fuselage carried a piston engine in the rear, driving a pair of contra-rotating propellers in a pusher configuration. The wings were swept back at an angle of 20 degrees, with a horizontal stabilizer mounted behind the propeller on twin booms running back from the wings. The fuselage was unusually streamlined, being round and barrel-shaped, with the forward-located pilot's cockpit fully faired-in to its lines and the nose ending in a round air intake which was ducted back internally to the engine. The undercarriage was a tricycle arrangement, with the main wheels retracting into the tailbooms. Propulsion was to be provided by the experimental Continental XIV-1430-3 inverted V-12 engine.

The XP-52 was canceled in October 1940 because the XIV-1430 engine ran into technical difficulties. Bell submitted a similar design to the US Navy as the Model 19, but this too was never built.

XP-59

Although generally similar in layout to the XP-52, the XP-59 was slightly larger and heavier, and was to be powered by a Pratt and Whitney R-2800-23 engine of .