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The Kutta-Joukowski theorem states that the lift per unit span is equal to

  • A.Circulation divided by the free-stream velocity
  • B.Density times free-stream velocity times circulation
  • C.Half the density times velocity squared times chord
  • D.Density times velocity squared times circulation

Answer: B

The theorem states that lift per unit span equals the product of the density, the free-stream velocity and the circulation about the section. In lifting-line theory this relation converts the spanwise circulation distribution into the spanwise lift distribution, which is why the circulation distribution is the quantity actually solved for.

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