Aerodynamics - Yawing, Slipstream

[Krallu]

Hi there.

I am trying to get a grip of the aerodynamics. I understand what happens but not in detail why.

For example when I apply rudder and yaws a small aircraft I get a roll. Everywhere people speak about the outer wing goes faster and creates more lift. Ok. But how can that be, the wings are attached to the aircraft. They must go with exactly the same speed??

Also the slipstream. Everyone says it rotates around and hits the fin on the left side pushing the aircraft to the left. But if it is a rotating spiral. How come it won't rotate and someday hit it on the right side? Why only on the left?

Thanks!