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The reference wing area used in aircraft design conventionally includes

  • A.Only the exposed wing outside the fuselage
  • B.The wing plus the tailplane
  • C.The wetted area of both surfaces
  • D.The part carried through the fuselage

Answer: D

The trapezoidal reference area extends the leading and trailing edges to the centreline, so it includes area buried in the fuselage. Since every coefficient is referred to it, quoting a coefficient without stating the reference is meaningless.

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