fw 190a5 flight model

[Glider]

What you say is correct but equally the control forces do have a bearing on the high speed turns.

No one would deny that the Zero was one of the best slow speed turners, but at anything above 250mph the controls were almost rigid and as a result its actual performance in a turn at these sppeds was very poor. Had the controls been given a different gearing/ configeration whatever then she would probably have been an even better all round fighter.

It was a similar story for the 109 but the critical speed was higher.

I have little doubt that the calculations and theories would say that the 109 and Zero had the wing performance and power to turn at higher speeds, but if you cannot move the controls then are going nowhere other than in a straight line or a gentle turn.