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A flying wing demonstrator is found to be extremely sensitive to small changes in loading, with handling deteriorating sharply for a shift of only a few centimetres.

Why is this configuration so sensitive?

  • A.Its engines are mounted too far aft
  • B.Its restoring moment comes only from wing reflex or washout and is small
  • C.Its wing area is too large
  • D.Its elevons are undersized

Answer: B

Without a tailplane there is no long moment arm to generate a strong restoring moment. The available static margin is inherently small, so a shift that a conventional aeroplane would absorb consumes most of what such a design has.

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