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A designer lengthens an aeroplane's fuselage by two metres, moving the tailplane further aft without changing its area.

What is the principal effect on longitudinal stability?

  • A.Stability is unchanged since the tail area is the same
  • B.Stability falls because the aeroplane is heavier
  • C.The neutral point moves forward
  • D.The tail volume ratio rises, increasing stability

Answer: D

Volume ratio scales directly with the moment arm, so the tail's stabilising power rises in proportion. Lengthening the fuselage is often preferred to enlarging the tail, since area brings weight and drag as well as stability.

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