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According to thin airfoil theory, the lift curve slope of any thin section is

  • A.Dependent on the Reynolds number
  • B.Two pi per radian, independent of camber and thickness
  • C.Two pi per radian for symmetric sections but larger for cambered ones
  • D.Dependent on the thickness-to-chord ratio

Answer: B

The slope comes out as two pi per radian regardless of the camber line, because camber affects only the constant part of the solution and not its dependence on incidence. Real sections measure a little below this because of the boundary layer, and thickness raises it very slightly, but two pi remains the standard reference.

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