This video shows what happens to the air flow over a wing as it stalls. Yarn, placed all over this airplane wing is pushed backward by laminar airflow during regular flight. When approaching stall speeds, the laminar layer moves forward more and more until it is all the way at the leading edge of the wing and drops off, causing the wing to stall. The yarn shows the turbulent air moving forward very clearly.
Note where the turbulence starts as the wing starts to stall, and how it reorganizes as the wing recovers from the stall.
This video was made by Harv’s Air in Stenbach, Manitoba, where the pilot taped four rows of 4.5 inch long pieces of yarn over the entire wing of a Diamond DA40. The flight was over Southern Manitoba.
This video does a good job of illustrating what happens to the airflow as it goes over the wing during stall. Read more about stalls and angle of attack here.
