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Douglas F4D Skyray
https://en.wikipedia.org/wiki/Douglas_F4D_Skyray
The Douglas F4D Skyray (later redesignated F-6 Skyray) is an American carrier-based fighter/interceptor built by the Douglas Aircraft Company. Although it was in service for a relatively short time (1956-1964) and never entered combat, it was the first carrier-launched aircraft to hold the world's absolute speed record, at 752.943 mph, and was the first United States Navy and United States Marine Corps fighter that could exceed Mach 1 in level flight. It was the last fighter produced by the Douglas Aircraft Company before it merged with McDonnell Aircraft and became McDonnell Douglas. The F5D Skylancer was an advanced development of the F4D Skyray that did not go into service. The Skyray was designed to meet a Navy requirement issued in 1947 for a fighter aircraft that could intercept and destroy an enemy aircraft at an altitude of 50,000 ft (15,240 m) within five minutes of the alarm being sounded. The Navy also wanted an aircraft that followed the designs and research of the German aerodynamicist Alexander Lippisch, who moved to the U.S. after World War II. The F4D Skyray was a wide delta wing design with long, sharply swept, rounded wings. The design was named for its resemblance to the manta ray. The thick wing roots contained the air intakes feeding a single turbojet engine. Fuel was contained both in the wings and the deep fuselage. Leading edge slats were fitted for increased lift during takeoff and landing, while the trailing edges were mostly elevon control surfaces. Additional pitch trimmers were fitted inboard near the jet exhaust, and were locked upwards on takeoff and landing. The Westinghouse J40 turbojet was the intended powerplant, but Douglas took a conservative view and designed in contingency options for other power plants. The J40 proved troublesome and was eventually cancelled, and the Skyray was fitted instead with the Pratt & Whitney J57, a more powerful but larger engine. Production aircraft were not delivered until early 1956, while the United States Marine Corps received their first in 1957. In total, 419 F4D-1 (later designated F-6 in the unified designation system) aircraft were produced. Its unique design also played a part in making the Skyray one of the best-known early jet fighters. It was affectionately known as the "Ford" (after the "Four" and "D" of its designation). In 1953, Edward H. Heinemann was awarded the Collier Trophy in recognition of his design work on the F4D. Role Fighter aircraft Manufacturer Douglas Aircraft Company First flight 23 January 1951 Introduction 1956 Retired 1964 Status Retired Primary users United States Navy United States Marine Corps Produced 1950–1958 Number built 422 Developed into Douglas F5D Skylancer In April 1956, VC-3 was the first squadron operational with the F4D-1. This unit was later redesignated VFAW-3 and assigned to NORAD, as the only United States Navy fighter squadron in what was predominantly a United States Air Force and Royal Canadian Air Force organization. VFAW-3 was permanently based at NAS North Island in San Diego. The U.S. Marine Corps also flew the Skyray. When the Department of Defense adopted a uniform aircraft designation system patterned on the U.S. Air Force aircraft designation system in September 1962, the F4D was redesignated as the F-6A Skyray. In addition to multiple Navy and Marine Corps squadrons, Naval Air Reserve and Marine Air Reserve squadrons VF-881, VF-882 and VMF-215 also flew the Skyray. The last operational squadron was VMF(AW)-115, which flew the Skyray until February 1964. The Skyray was designed exclusively for the high-altitude interception role, with a high rate and angle of climb. It set a new time-to-altitude record, flying from a standing start to 49,221 feet (15,003 m) in 2 minutes and 36 seconds, all while flying at a 70° pitch angle. As a dedicated interceptor, the F4D was unsuited to the multi-mission capabilities soon in demand, so it had a short career in Navy and Marine Corps service, the last aircraft being withdrawn from service in 1964. Four aircraft were used by NACA (soon to be NASA) until 1969. Under the new 1962 United States Tri-Service aircraft designation system, the F4D-1 was redesignated the F-6A. The F4D (old designation) should not be confused with the F-4D (new designation) – the latter being the "D" variant of the McDonnell Douglas F-4 Phantom II operated by the U.S. Air Force. Specifications (F4D-1) General characteristics Crew: one Length: 45 ft 3 in (13.8 m) Wingspan: 33 ft 6 in (10.21 m) Height: 13 ft 0 in (3.96 m) Wing area: 557 sq ft (52 m2) Empty weight: 16,024 lb (7,268 kg) Loaded weight: 22,648 lb (10,273 kg) Max. takeoff weight: 27,116 lb (12,300 kg) Powerplant: 1 × Pratt & Whitney J57-P-8, -8A or -8B turbojet Dry thrust: 10,200 lbf (45 kN) Thrust with afterburner: 16,000 lbf (64.5 kN) Performance Maximum speed: 722 mph (627 kn, 1,162 km/h) Range: 700 mi (610 nmi, 1,100 km) combat Ferry range: 1,200 mi (1,040 nmi, 1,900 km) Service ceiling: 55,000 ft (17,000 m) Rate of climb: 18,300 ft/min (93.3 m/s) Wing loading: 41 lb/sq ft (198 kg/m2) Thrust/weight: 0.71 Armament Guns: 4 × 20 mm Colt Mk 12 cannon, 2 each just aft of the wing leading edge, mid-wing, underside, with 65 rounds/gun Rockets: 6 pods of 7 2.75 in (70 mm) unguided rockets or 4 pods of 19 2.75 in (70 mm) unguided rockets Missiles: 4 × AIM-9 Sidewinder air-to-air missiles Bombs: 2 × 2,000 lb (907 kg) bombs Avionics APQ-50A radar Aero 13F fire-control radar * |
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