F-4X PHANTOM III: The swing-wing Phantom

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The US Navy’s F-111B project was looking distinctly shaky in the mid-1960s. It was too heavy and too sluggish, so the Navy looked around for alternatives, a search which would eventually led to the Grumman F-14 Tomcat. The McDonnell company offered an unsolicited solution, a variable geometry wing variant of the hugely successful F-4 Phantom II. An assessment of this proposal, given the provisional designation F-4 (FV)S, revealed that this it was lacking in several key areas, notably combat effectiveness: the AN / AWG-10 radar and AIM-7F missiles would be a significant downgrade from the desired AN /AWG-9/AIM-54 combination. Scorned by the Navy, McDonnell offered the aircraft to Britain as a cheaper alternative to the Anglo-French AFVG then under consideration. This aircraft would have been powered by the British Rolls-Royce RB-168-27R  and given the designation F-4M (FVS). This promising project never left the drawing board.

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