"The USN evaluation of the F-8E found that the MiG-21 could out turn the F-8 in a close-in fight.Zoom performance was comparable below 25,000 ft and on station time was also comparable. Large size and prominent smoke trail was a disadvantage. The F-8E was capable of exceeding the MiG-21 speed limit at low altitude. Acceleration performance was better than the MiG-21 at low and medium altitudes below 1.2 Mach

ADC Evaluated the F-106 and found its radar capable of acquisition and that radar snap-up attack with all aspect armament should be used to exploit MiG-21 lack of fire control. The F-106 could use better acceleration to get beyond MiG-21 speed limit if not in an advantageous position. The F-106 should use missiles then close in to gun kill position. It was the consensus of ADC that the U.S. needed to expedite procurement of cannon for F-106, and replacement of its canopy bar with clear pane. It was concluded that the F-106 shouldn’t attempt a slow speed turning contest and should keep its speed from 400-450 KCAS during patrol and engagement.

The TAC evaluation of the F-5A revealed that within performance limits, the F-5 had considerable capability to engage the MiG-21. The F-5 had performance advantage below 15,000 feet, however the MiG-21 had higher Mach capability at higher altitude. Overall turn comparison was about equal and level acceleration was equal in military power, MiG-21 had a slight advantage in afterburner. They had comparable fire control systems. The F-5 controlled the tactical engagement effectively and if defensive separation was necessary, the F-5 could exceed the MiG-21 airspeed limit below 15,000 ft. The F-5 could closely simulate the MiG-21 up to Mach 1.2 for combat crew training in ACM, dissimilar aircraft engagements. "

I wonder why F-8E should have such acceleration (climb rate) to beat MiG-21 or what g it can sustain in turn ???