Fluid Dymanics of Drag – Boundary Layers

Excellent video showing in real experiments you can understand and see. Shows what the boundary layer is, what a stall looks like (if you could see the air) and vorticity. EXCELLENT!

Part 1:

Part 2:

Notice also as the airfoil is inclining to higher and higher angles of attack, that the air is not split on what appears to be the most forward portion of the airflow, but rather below that portion of the airfoil. There is a ton of information here to help you understand why things work the way they do. Enjoy!