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During a straight and level flight the pilot eases back on the control column to gain altitude. What effect will this have on the stagnation point of the aerofoil, and the angle of attack?

The leading edge stagnation point of the aerofoil moves towards the _____ surface of the aerofoil as the angle of attack _____.
  • A
    Lower, increases.
  • B
    Upper, increases.
  • C
    Lower, decreases.
  • D
    Upper, decreases.

Note: The wording “eases back on the control column” is unusual, but has been confirmed by student feedback. We understand this means that the pilot applies back pressure.

Refer to figure.
The stagnation point is that point on an airfoil at which the approaching airflow becomes stationary.

It is located on the leading edge of the airfoil just below the maximum point of curvature and moves downward and aft along the lower surface of the airfoil profile as the angle of attack increases. The stagnation pressure, the pressure necessary to stop the airflow at the stagnation point, is equal to the dynamic pressure plus the static pressure.

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