Originally posted by a088008
Thanks for the explanations. 
I do, however, notice that those indoor aerobatic electric planes use very few ribs and essentially have a sharp leading edge due to sag in-between ribs. How do these types of planes perform? Does anybody have experience flying these type of planes?
-Q.
I'm defenitely not an aerodynamics pro, but my idea about these fun-fly type planes is this: keep the wingloading low enough and the plane small enough and it will do whatever you want it to do...regardless of aerodynamics and wing sections.
I once read this in an article on aerodynamics: "Imagine how a fly thinks about air..." I find this a very nice statement. A fly must be experiencing air as we do water for instance. This is of course the Reynolds number at work...