Discussion
Assertion (A): A symmetric airfoil produces no lift at zero angle of attack.
Reason (R): A symmetric airfoil has its mean camber line coincident with the chord line.
Select the correct answer from the options below.
Answer: A
Both statements are true and the reason is the explanation: with the mean line on the chord the upper and lower surfaces are mirror images, the pressure distributions cancel, and no lift results. Introducing camber breaks that symmetry and produces lift at zero incidence.
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