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The neutral point lies at 0.45 of the mean chord and the centre of gravity at 0.30. The static margin is

  • A.0.15 chord
  • B.0.75 chord
  • C.0.30 chord
  • D.1.5 chord

Answer: A

The margin is the difference \( 0.45 - 0.30 = 0.15 \) expressed as a fraction of the mean aerodynamic chord. Margins of ten to twenty per cent are typical for a transport aeroplane, giving adequate stability without excessive stick forces.

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