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Which of the following is NOT a prediction of thin airfoil theory?

  • A.An aerodynamic centre at the quarter chord
  • B.Zero moment about the quarter chord for a symmetric section
  • C.The drag of the section at a given angle of attack
  • D.A lift curve slope of two pi per radian

Answer: C

Thin airfoil theory is inviscid, so it gives no drag whatever, which is d'Alembert's paradox in another form. The other three results are exactly what the theory does provide, and all three agree well with measurement at low incidence.

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