Just before a wing stalls, the airflow "burbles," or becomes turbulent over the upper surface of the wing. It reduces the efficiency of the airfoil.

U.S. Centennial of Flight Commission home page

Just before a wing stalls, the airflow 'burbles,' or becomes turbulent over the upper surface of the wing. It reduces the efficiency of the airfoil.

Just before a wing stalls, the airflow "burbles," or becomes turbulent over the upper surface of the wing. It reduces the efficiency of the airfoil.

Credits - NASA

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