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At small angles of attack, the lift is approximately equal to

  • A.The sum of the normal and axial forces
  • B.The difference between drag and thrust
  • C.The normal force
  • D.The axial force

Answer: C

Because the cosine of a small angle is close to one and the sine is small, lift and normal force nearly coincide at low incidence. The approximation fails badly at high angles, where the axial contribution to lift is no longer negligible.

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