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A large static margin is always desirable. True or false?

  • A.True, provided the elevator is large enough
  • B.False, because it reduces the restoring moment
  • C.False, it brings heavy stick forces and greater trim drag
  • D.True, more stability is always better

Answer: C

Excessive margin makes the aeroplane heavy on the controls, increases trim drag and restricts the forward loading limit. The design aim is a margin adequate for the handling required rather than the largest achievable.

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