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Difference Between Induced AoA Geometric AoA and Effective AoA

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  • Difference Between Induced AoA Geometric AoA and Effective AoA

    I am struggling to understand these concepts, I think it will help me for propellers concept too but I'm not sure(please correct me if I am wrong) and for the topic of Ground Effect. Plain English or Spanish please...I have seen some graphics but these are senseless...THANKS in advance.

  • #2
    Geometric AoA is not a term you will find in the EASA learning objectives.

    When studying the aerofoil section of wing, we define the angle of attack. This is the angle between the chordline and the undisturbed airflow.
    But in reality the airflow gets disturbed before it reaches the leading edge of the wing. Upwash develops, so we need to divide the angle of attack into the effective angle of attack and the induced angle. As illustrated in ATPdigital lesson 3 pages 15, 16, and 17.

    When studying propellers, a different set of terms are used, which include geometric pitch. These terms are shown and defined in ATPdigtal lesson 18 pages 1, 2 and 3.

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