[Syonyk]

> (see also: what causes lift in an airfoil)

That's easy! It pushes air down, and the reaction force is what we call lift!

... now, why it pushes air down... there be many computational fluid dynamics PhDs... though "angle of attack" covers a lot, and the rest is just efficiency tweaks.

Good question for teachers who insist it's the Bernoulli Principle: "But my paper airplane has flat wings and flies just fine!" toss across classroom