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Fin volume ratio is defined as

  • A.Fin lift divided by wing lift
  • B.Fin area times arm over wing area and span
  • C.Fin area divided by wing area
  • D.Fin arm divided by wing chord

Answer: B

Span is used as the reference length rather than chord, because yawing moments are naturally non-dimensionalised on the lateral dimension. The grouping captures the fin's stabilising power in a single number just as tail volume ratio does in pitch.

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