F4D Skyray
The Douglas F4D Skyray was a carrier-based fighter built by the Douglas Aircraft Company. Although it was in service for a very short time and never fired a shot in anger, it was notable for being the first carrier-launched plane to hold the world's absolute speed record and was the first Navy fighter capable of exceeding Mach 1 in level flight. It was also distinguished in being used by the only Navy Squadron (VFAW-3) assigned to the North American Air Defense Command. VFAW-3 was permanently based at NAS North Island, San Diego. Its unique and notable looks also played a part in making the Skyray one of the best-remembered early jet fighters. Affectionately known as the "Ford", this aircraft had a spectacular rate and angle of climb and set new time to altitude records.
Later designated F-6 in the unified designation scheme, the Skyray's almost delta-winged planform was inspired by Alexander Lippisch's work in Germany during World War II. The Skyray was a tailless design with long, sharply swept, rounded wings. The thick wing roots contained the air intakes feeding a single turbojet. 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 upward on takeoff and landing.
Originally built for the Westinghouse J40 turbojet, the Douglas designers fortunately took a conservative view and gave space for other powerplants. 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 U.S. Marine Corps received their first in 1957. In total, 419 F4D-1 aircraft were produced.
The Skyray was designed exclusively for the high-altitude interception role and was unsuited to the multi-mission capabilities soon in demand, so it had a short life in Navy and Marine Corps service, the last planes being withdrawn from service in 1964. A single aircraft was used by NACA (soon to be NASA) until 1969.
A derived successor, the F5D Skylancer, was designed and prototypes were built, but it was cancelled as too similar in mission parameters to the Vought F8U Crusader and also to reduce dependence upon Douglas Aircraft, which was also producing several other aircraft for the U. S. Navy.
Redesignated
With the new joint services designations (replacing the Air Force "century series" and the Navy/Marine designations (which included a manufacture letter code), the F4D was redesignated as the F-6A.
Possible confusion: The F4D (old designation) should not be confused with the F-4D (new designation) - the latter being the "D" variant of the McDonnell F-4 Phantom II.
Specifications (Douglas F4D Skyray)
General characteristics<h3>
- Crew: 1
<li> Length: 45 ft 3 in (13.8 m)
<li> Wingspan: 33 ft 6 in (m)
<li> Height: 13 ft 0 in (10.2 m)
<li> Wing area: 557 ft² (52 m²)
<li> Empty weight: 16,024 lb (7,268 kg)
<li> Loaded weight: 22,648 lb (10,273 kg)
<li> Maximum gross takeoff weight: 27,116 lb (12,300 kg)
<li> Powerplant: 1× Pratt & Whitney J57-P-8, -8A or -8B turbojet, 10,200 lbf dry; 16,000 lbf afterburner (45 kN / 71 kN)
</ul>
<h3>Performance<h3>
<li> Maximum speed: 722 mph (1,200 km/h)
<li> Range: 700 mi combat, 1,200 mi ferry (1,100 km / 1,900 km)
<li> Service ceiling: 55,000 ft (17,000 m)
<li> Climb rate: 18,300 ft/min (93.3 m/s)
<li> Wing loading: lb/ft² (kg/m²)
<li> Thrust/weight: 0.71:1
<h3>Armament<h3>
- 4x 20 mm cannons in the wing roots
- 2x 2,000 lb (907 kg) bombs
- 2x AIM-9 Sidewinder missiles
- 6 pods of 7x 2.75 in (70 mm) unguided rockets, or 4 pods of 19x 2.75 (70 mm) rockets
<h3>Avionics<h3>
- APQ-50A radar
- Aero 13F fire-control radar
-
<li> Maximum speed: 722 mph (1,200 km/h)
<li> Range: 700 mi combat, 1,200 mi ferry (1,100 km / 1,900 km)
<li> Service ceiling: 55,000 ft (17,000 m)
<li> Climb rate: 18,300 ft/min (93.3 m/s)
<li> Wing loading: lb/ft² (kg/m²)
<li> Thrust/weight: 0.71:1
<h3>Armament<h3>
- 4x 20 mm cannons in the wing roots
- 2x 2,000 lb (907 kg) bombs
- 2x AIM-9 Sidewinder missiles
- 6 pods of 7x 2.75 in (70 mm) unguided rockets, or 4 pods of 19x 2.75 (70 mm) rockets
<h3>Avionics<h3>
- APQ-50A radar
- Aero 13F fire-control radar
Related content
Related development<h3> <h3>Comparable aircraft<h3> <h3>Designation sequence<h3>
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