Engines: Two Allison V-1710-125 liquid-cooled V-12 engines, each rated at 1325 hp for takeoff and 1800 hp war emergency.
Performance: Maximum speed 410 mph at 23,440 feet, 344 mph at sea level. Cruising speed 312 mph. Service ceiling 29,400 feet. Normal range 1800 miles, maximum range 5400 miles.
Dimensions: Wingspan 70 feet 6 inches, length 53 feet 8 inches, height 18 feet 10 inches, wing area 555 square feet.
Weights: 20,888 pounds empty, 33,208 pounds gross, 35,702 pounds maximum loaded.
Armament: Four 0.50-inch machine guns installed in remotely-controlled turrets on the trailing edges of the wings. The bomb bay could carry a maximum load of four 2000-pound bombs.