The Douglas F5D-1 Skylancer was a progressive development of the F4D-1 Skyray. Many people believe that the Skylancer was a faster and better choice than its competitor, the Vought F8U Crusader. They believe that it had inherently better stretch potential to the point where it could have out-performed the F-4 Phantom if the J-79 engine had been installed as envisioned by Ed Heinemann....