Hello, I,ve been following your thread and I have some info that might help. the wing stalls because it is subjected to a certain angle and turbulance is formed on top of the wing making it loose lift. To make the root stall before the tip the most influencing factor is the sharpness of the leading edge not the thickness of the wing, the sharper the L.E. the earlier the stall.(EX: the funtanaS40's L.E. gets sharper towards the root although the wing manteins the same thickness) thick wings are employed to allow for wider leading edges. making the le wider will allow the wing stall at a steeper angle not to mention that it also gives more lift. to avoid tip stalls the are various methods including making the leading edge sharper towards the root so the root will stall at lower angle than the tip eliminating tip stalls. I'll put up some pics when I get the chance about an article explaining the different techniques to "TAME THE STALL" (great article!!!). I hope this solves lots of your questions and helps you!