Not All Airfoils Stall the Same, Part 2

Laminar short bubble
As the angle of attack is increased on a high-performance airfoil, a small amount of separation occurs near the leading edge. This separation causes the boundary layer to transition from laminar to turbulent, and at this point the airflow forms a small rotating “bubble” that helps to reattach the boundary layer to the airfoil. This laminar short bubble remains attached to the airfoil until the AOA is increased to a critical value. Credit: Pete Reynolds, “Learjet Stall Development,” Learjet Corp., 1990
In Part 1 of this article, we discussed airfoil design and trailing-edge stall. Even though you have been inundated throughout your flying career about the trailing-edge stall behavior of an airfoil, what is the likelihood that your high-performance aircraft utilizes an airfoil of this older design...

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