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The resultant aerodynamic force on a body is most usefully resolved into

  • A.Lift perpendicular and drag parallel to the relative wind
  • B.Lift parallel and drag perpendicular to the relative wind
  • C.Weight vertically and thrust along the fuselage axis
  • D.Normal force along the chord and axial force across it

Answer: A

Lift and drag are defined with respect to the oncoming flow, which is what makes them useful in performance work. The alternative resolution into normal and axial components uses the body axes instead and is convenient for structural loading.

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