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Weak dihedral effect relative to strong directional stability tends to produce

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

Answer: C

The weathercock turns the nose into a developing turn faster than the wings can be rolled level. The resulting spiral is slow and easily controlled, which is why designers often accept it in preference to a bad Dutch roll.

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