The design embodied several innovatory features. Not least of these was an attempt to maintain true aerofoil sections throughout the entire fighter, the centre fuselage and the rear portions of the engine nacelles merging to give the aircraft a unique appearance. The two 1,350 hp Continental XI-1430 twelve-cylinder inverted V-engines were fitted with General Electric D-23 turbo-superchargers and featured exhaust thrust augmentation. The cabin was designed to be pressurized and proposed armament comprised six 1.46 in (37 mm) M-4 cannon.
The first XP-67, unpressurized and unarmed, was flown from Scott Field, Illinois, USA on January 6, 1944, and flight trials continued until September 6, 1944, when the prototype suffered irreparable damage by engine fire. This accident and the unsatisfactory nature of certain aspects of the fighter's performance led to the decision to abandon the second prototype and terminate the development contract. The aircraft was nicknamed Moonbat, Bat and Bomber Destroyer."
Span: 55 ft 0 in (16.76 m)
Length: 44 ft 9.25 in (13.65 m)
Height: 15 ft 9 in (4.80 m)
Wing area: 414 sq.ft (38.46 sq.m)
Weight empty: 17,745 lb (8,049 kg)
Loaded weight: 22,114 lb (10,031 kg)
Max speed: 405 mph (652 kmh) at 25,000 ft (7,620 m)
Climb: 2,600 ft (792 m)/min
Range: 2,385 mls (3,838 km)