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       A modified delta-wing aircraft, the  XF4D first flew in 1951.  The
      second prototype set a world speed record of 753 mph in 1953. 
      Problems with the proposed Westinghouse J40 engine led to adoption of the
      Pratt & Whitney J57 with production deliveries to the Navy beginning
      in 1956. 
      The  F4D was used in front-line service until the late 1960s.  It was
      redesignated the  F-6 in 1962. 
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          | Specifications | 
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                | F4D: U.S. Navy (prior to 1962) |  
                | F-6: U.S. Navy (after 1962) |  
             
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             Related
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