Discussion
Which statement about a symmetric airfoil section is TRUE?
Answer: C
Correct answer: A symmetric airfoil has zero pitching moment about its quarter chord
This follows from the symmetry of the pressure distribution: with no camber there is nothing to produce a couple about the quarter chord, so \( c_{m,c/4} = 0 \). The other three are all false - a cambered section has a negative zero-lift angle, thin airfoil theory is inviscid and says nothing about profile drag, and a symmetric section produces no lift at zero incidence.
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