Discussion
The angle of attack is measured between the chord line and
Answer: D
Correct answer: The relative wind
Angle of attack is a purely aerodynamic quantity: the angle between the chord line and the oncoming flow. It is not the pitch attitude, which is measured against the horizon, and the two differ by the flight path angle. An aircraft descending steeply can hold a high angle of attack with the nose below the horizon, which is exactly how an approach-to-stall in a descent catches people out.
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