This aircraft had a wingspan of 110 feet, a length of 67 feet 7 5/8 inches, and a height of 18 feet. Its maximum weight was 65,000 pounds and its empty weight was 36,500 pounds. It carried a bomb load of 8,000 to 10,000 pounds, averaging 16 500-pound bombs or 4 2000-pound bombs. Its armament consisted of ten .50 caliber machine guns, and its crew numbered ten. Power came from four 1200 hp Pratt & Whitney R-1830 65 engines, with 14 cylinders, turbo charged and super charged. Performance included a maximum speed of 290 mph, a service ceiling of 26,000 feet, a cruise speed of 180 mph, and a maximum range of 3000 miles.