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Is lift to drag ratio, maximum at zero degrees angle of attack?

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in Aerodynamics by (773k points)
Is lift to drag ratio, maximum at zero degrees angle of attack?

(a) False

(b) True

I had been asked this question during an interview for a job.

My question comes from Airfoil Characteristics in chapter Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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The correct answer is (a) False

Explanation: The lift-drag ratio will reach its maximum at zero degree angle of attack, at this angle we obtain the most lift for less amount of drag.so, that the aircraft will get maximum amount of lift at zero angle of attack.

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