| Summary: | First flight Primary users Number built Developed from 21 April 1956 United States Navy United States Marine Corps 4 F4D Skyray The United States Douglas FSD 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 357 eventually fined to the Skyray instead of the Westinghouse 140 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 FSD 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.
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