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In thin airfoil theory the airfoil is replaced by

  • A.A vortex sheet placed along the mean camber line
  • B.A source sheet placed along the chord line
  • C.A doublet at the quarter-chord point
  • D.A single point vortex at the leading edge

Answer: A

The theory models the airfoil as a sheet of vorticity distributed along the mean camber line, with the sheet strength varying from leading to trailing edge. Because thickness is discarded, only camber and incidence survive, and the whole problem reduces to finding the one distribution that makes the camber line a streamline.

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