ORIGINAL: BMatthews

OK, now I'm a bit confused. Paul, from the first chart it seems to indicate that the zero lift angle changes as the Reynolds number changes. It also shows that as the Reynolds number drops (either due to speed decreasing or chord becoming smaller) that the lift coefficient changes. That seems a bit odd to me. I would have thought that a zero lift angle of attack would remain constant with speed. Explanations anyone?

Hai Dang, I know this stuff is hard to pick up but if you're going to use it to design a better glider then you really need to get to understand it better. It's a long and rocky road but just when you're feet feel like they've been chewed off up to the ankles it'll suddenly all make some sense.