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Douglas F5D Skylancer
The United States Douglas F5D Skylancer was a development of the F4D Skyray jet fighter for the United States Navy. Starting out as the F4D-2N, an all-weather version of the Skyray, the design was soon modified to take full advantage of the extra thrust of the Pratt & Whitney J57 eventually fitted to the Skyray instead of the Westinghouse J40 originally planned.
==Design and development==
Soon the design became too different from the Skyray to be considered just a variation of it, and the aircraft was assigned a new designation as the F5D Skylancer. Almost every part of the airframe was modified, though the basic form remained the same as did the wing shape, though it became much thinner. The wing skinning was reinforced, correcting a problem found in the F4D. The fuselage was 8 ft (2.4 m) longer and area ruled to reduce transonic drag, being thinner in the region of the wing roots. Everything was shaped to reduce drag and increase stability at high speed.
Although the four 20 mm (.79 in) cannon in the wing roots were retained, primary armament was to be missiles or rockets; four AIM-9 Sidewinders or two AIM-7 Sparrows, and/or a battery of spin-stabilized unguided 2 in (51 mm) rockets.
Nine test airframes were ordered, with a 51-aircraft production order to follow. Production aircraft were to be powered by the more powerful J57-P-14 engine, while there were plans to use the even more powerful General Electric J79.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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