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.

The short fuselage carried a piston engine in the rear, driving a pair of contra-rotating propellers in a pusher configuration.

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.

[3] 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 2,000 horsepower (1,500 kW).