Hi dtango,
thanks for your clarification, i got what you mean, regarding the turn/climb, but actually a "dirty" turn at 100mph is possible. I dont was aware of this and this turn is rather difficult to maintain, but its possible. Its a very unstable nose up turn. Its possible to get there, from the 100mph climb, by banking the plane.
While making a horizontal turn, its not possible to get into this 100mph turn, without to start a initial climbturn.
But i still think that the turn rate with full flaps should be worse than what we have now.
Imho thats caused by the rather bad CD/CL² relation, which at least the F2A show. Where the 10° flap variation should provide a more effective sustained turn.

I dont think that a plane with less effective CD/CL² relation can produce a much smaler radius, without to lose turn rate. And this is only the CD/CL² relation of the wing, the worse thrustline, the wose "excess llift", the greater thrust problems/the higher needed aleron variation etc at slower speed dont will help to offer a so much better turn radius with very similar turn rate, like we have it in Ah now.
Of course, as long as the calculations dont include the disadvanced thrust line and the relative smaler "excess lift" and the other rather problematic factors while slow flights, all looks more friendly.
Specialy for a plane with so much power the thrustline must be a significant influence to the climb and turn.
Some more thoughts to the excess thrust / turn discrepancy i see:
If the plane with full flaps and max AoA climb with 75mph with only 1700ft/min, while the plane with 100mph and also max AoA (close to) climb with 2700ft/min, this display that the drag(not the CD) is much higher with full flaps, despite the fact that the plane without flaps fly much faster, therefor the CD must be even worse.
But in your turn diagram, where also both planes turn with max AoA, one at 100mph, the other at 160mph, both planes offer the same excess thrust.
How is that possible??
btw, the full F4U-4 have its min turn speed at 110mph and 170mph, so accordingto your diagram, the faster plane should turn faster.
And where do you got that curves from?
And Brooke dont had the same conclusion, he wrote that the turnrate should increase with full flaps. That other sims and also AH some time ago do/did it in the way i say is also something to think about.
Anyway, i think only real tests can show how it realy was, smal different values in the calculation would show how i think it should be.
Are there more tests similar to the F2A around?? Unfortunately thats the only real good turn test i ever saw, specialy with flaps included.
Hi Saxman,
currently i dont saw any turn test for any F4U, the calculations dont include the changed thrustline, neighter the smaler relative "excess lift" cause the slower speed, while flying with full flaps.
Unfortunately the F2A test dont include a climb test with/without flaps, so we also cant get a good idea how the flaps influence the climb at different speeds, i even dont saw any sources to display the influence of the climb speed to the climb rate. So we even dont know if the F4U-4 without flaps had realy a climb ratio of around 2700ft/min at 100mph.
I still have my doubts regarding the way it is in AH now.
Greetings,
Knegel