Although at first glance the Phantom FGR.2 appears very similar to its American counterpart the F-4C Phantom II, there are a number of major visual and performance differences between the two aircraft. Phantoms produced for the RAF were redesigned to use British Rolls-Royce Spey turbofan engines, instead of the General Electric J79 turbojet engines found on American Phantoms. The British engines produced more thrust than the American engines, but were larger; as a result, the fuselage of British Phantoms was modified to be slightly wider than on the American models.
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