Specification (P-47D-25-RE Thunderbolt) Powerplant: One Pratt & Whitney Double Wasp , XR-2800-21 eighteen-cylinder two-row radial engine developing 2,000 h.p. for take-off and 2,300 h.p. at 31,000 ft. with turbo-supercharging. Dimensions: Length: 36 ft. 1.25 in. (11.01 m) Height: 14 ft 2 in (4.32 m) Wing span: 40 ft. 9.25 in (12.43 m) Weights: Empty: 10,700 lb. (4,858 kg) Operational: 19,400 lb (8,807 kg) Performance: Maximum speed: 428 mph (689 km/h) Service ceiling: 42,000 ft. (12,810 m) Range: 925 miles (1,488 km) Armament: Six or eight 0.5-in. wing-mounted Browning machine-guns with 267 or 425 rounds per gun and up to 2,500 lb. of bombs or ten 5-in. HVAR missiles.