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The Whitcomb area rule states that transonic wave drag depends chiefly on

  • A.The wing planform alone
  • B.The thickness of the fuselage skin
  • C.The total wetted area of the aircraft
  • D.The streamwise cross-sectional area distribution

Answer: D

Whitcomb showed that the whole aircraft behaves, at transonic speeds, like a body of revolution with the same streamwise area distribution. Making that distribution smooth is what matters, which is why fuselages were waisted at the wing junction to give the characteristic Coke-bottle shape.

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