Discussion
An airfoil operating at its zero-lift angle of attack still experiences
Answer: B
Correct answer: Profile drag from friction and form effects
At the zero-lift angle the section produces no lift, but the air still flows over it, so the boundary layer still exerts skin friction and the displacement effect still alters the pressure distribution. Induced drag, by contrast, is a consequence of lift and of trailing vortices, so a two-dimensional section at zero lift has none.
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