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Thin airfoil theory gives the lift coefficient of a cambered section as

  • A.Two pi times the angle measured from the zero-lift angle
  • B.Two pi times the geometric angle of attack
  • C.Pi times the angle measured from the zero-lift angle
  • D.Four pi times the geometric angle of attack

Answer: A

The result is two pi times the difference between the geometric angle and the zero-lift angle. Camber does not change the slope of the lift curve; it merely shifts the curve sideways by altering the zero-lift angle. A symmetric section is the special case in which that shift is zero.

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