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

  • A.Two pi times the angle of attack in radians
  • B.Pi times the angle of attack in radians
  • C.Four pi times the angle of attack in radians
  • D.The angle of attack in radians divided by two pi

Answer: A

For a symmetric section the zero-lift angle is itself zero, so the slope of two pi per radian applies directly to the geometric angle. Expressed per degree this is about 0.11, and real sections come close to it until viscous effects intervene near the stall.

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