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Excessive dihedral effect relative to directional stability tends to produce

  • A.Aileron reversal
  • B.A poorly damped Dutch roll
  • C.Spiral instability
  • D.Pitch instability

Answer: B

The strong rolling response to sideslip drives an oscillation in which yaw and roll couple together. Too little dihedral effect gives the opposite failing, a divergent spiral, so the two must be kept in a workable balance.

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