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Normal force and axial force differ from lift and drag in that they are resolved along

  • A.The span and the chord of the wing respectively
  • B.The body axes rather than the wind axes
  • C.The wind axes rather than the body axes
  • D.The vertical and horizontal directions on the ground

Answer: B

Normal force acts perpendicular to the chord and axial force along it, so at zero angle of attack the two systems coincide. As the angle grows they diverge, and converting between them requires the sine and cosine of that angle.

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