NORTH AMERICAN P-51 MUSTANG The P-51 was designed as the NA-73 in 1940 at Britain's request. The design showed promise, and AAF purchases of Allison-powered Mustangs began in 1941, primarily for photo recon and ground support use due to its limited high-altitude performance. But in 1942, tests of P-51s using the British Rolls-Royce "Merlin" engine revealed much improved speed and service ceiling, and in December 1943 Merlin-powered P-51Bs first entered combat over Europe. Providing high-altitude escort to B-17s and B-24s, they scored heavily over German interceptors, and by war's end, P-51s had destroyed 4,950 enemy aircraft in the air, more than any other fighter in Europe. Mustangs served in nearly every combat zone, including the Pacific where they escorted B-29s to Japan from Iwo Jima. Between 1941 and 1945, the AAF ordered 14,855 Mustangs (including A-36A dive bomber and F-6 photo recon versions), of which 7,956 were P-51Ds. During the Korean War, P-51Ds were used primarily for close support of ground forces until withdrawn from combat in 1953. The National Museum of the United States Air Force has a P-51D on display in its Air Power Gallery. Type Number built/ converted Remarks XP-51 2 Model NA-73; developed for UK P-51 150 Prod. model; four 20mm cannon P-51A 310 Fitted with bomb racks; four .50-cal. mgs. XP-51B 2 (cv) Improved P-51; was XP-78 P-51B-NA 1,988 Prod. model; Blocks 1-15; Inglewood P-51C-NT 1,750 Dallas plant; Blocks 1-11 P-51D-NA 6,502 Bubble canopy; Blocks 1-30 P-51D-NT 1,454 Blocks 5-30; six .50-cal. mgs. TP-51D-NT 10 Two-place trainer variant P-51E 0 Designation not assigned XP-51F 3 Exp. lt. weight test model XP-51G 2 Modified XP-51F with new engine P-51H-NA 555 Prod. model; Blocks 1-10 XP-51J 2 Modified XP-51F with new engine P-51K-NT 1,337 Improved D; Aeroprop; Blocks 1-15 P-51L-NA 1 Improved H with new engine P-51M-NT 1 Improved H with new engine SPECIFICATIONS (P-51D): Span: 37 ft. 0 in. Length: 32 ft. 3 in. Height: 13 ft. 8 in. Weight: 12,100 lbs. maximum Armament: Six .50-cal. machine guns and 10 5-in. rockets or 2,000 lbs. of bombs Engine: Packard-built Rolls-Royce "Merlin" V-1650 of 1,695 hp Cost: $54,000 PERFORMANCE: Maximum speed: 437 mph Cruising speed: 275 mph Range: 1,000 miles Service ceiling: 41,900 ft.