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Wing-body blending on a modern transport is used partly to

  • A.Reduce the aircraft's wetted area to zero
  • B.Eliminate the need for a vertical fin
  • C.Smooth the area distribution and cut interference
  • D.Increase the wing's thickness ratio

Answer: C

A fillet or blended junction avoids the abrupt area change and the corner flow that a plain intersection would produce, cutting both wave drag and the interference drag caused by two boundary layers meeting. It is the area rule applied with a lighter touch than a waisted fuselage.

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