Do the wings on the helicopter need to have airfoils like the wing of a wright stuff plane, or simply flat with a twist? I guess I am not sure how it generates its lift . . . . simply by moving the air?
No problem, and actually a good question.
Ideally, the blades (or wings) of your rotors should be airfoil shaped and have a twist as they do create lift, just like a wing. Problem is, they aren't operating in a uniform velocity field like a wing, even if the air is flowing as a body uniformly past or through the rotor. The tips are moving much faster through that field than the hub so need different angles to have an appropriate angle of attack.
But, just like Wright Stuff, they will work even if flat, if angled properly. And even if not twisted. Just not as efficiently. The poster I was answering with the flat blade suggestion wanted a quick and dirty solution to a working copter in four days. Flat is quick, dirty and inefficient aerodynamically, but quick. And it will fly better than you expect. I was getting 30 seconds with last years trial rules and flat blades. No where near the capability of these things, but it flew. Thirty seconds would have one a lot of regional trials I saw this year. Probably not so much next or the year after when the students get things figured out.
Oh, side comment. ALL wings generate lift by moving the air. For the plane to go up, it HAS to push the air down, equal and opposite reactions and all. The shape of the airfoil just helps some do it more efficiently than the others. The trick is to keep the wing (or rotor) moving in a stable, consistent fashion.