Using the Zenair CH 640 as an example, Mr. Chris Heintz claims "I guess fat wings are one of my trademarks. The depth lets me build a strong wing that is very light, and gives excellent stall characteristics as well. Under 200 mph, the thickness doesn't contribute to significant drag, so why not use it for its other advantages?" This is a question about the effects of thinning the design of the wing. I am assuming that would result in less drag and a faster stall speed? The stall would be more abrupt? I know that going with a different airfoil design would have an effect, but for now, let's assume the same camber and generally the same airfoil design, just slimmer.