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A statically stable aeroplane is always dynamically stable. True or false?

  • A.True, provided the damping is positive
  • B.False, static stability implies dynamic instability
  • C.False, the subsequent motion may still diverge
  • D.True, static stability implies dynamic stability

Answer: C

Static stability guarantees only that the initial response opposes the disturbance. Whether the resulting oscillation grows, decays or persists depends on damping, which is an entirely separate property of the aeroplane.

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