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An aeroplane is reported as easy to fly but showing a slow tendency to tighten into a turn if the wings are not held level.

What balance of stabilities does this suggest?

  • A.Strong directional stability with weak lateral stability
  • B.Weak directional stability with strong lateral stability
  • C.Weak stability in both axes
  • D.Strong stability in both axes

Answer: A

The weathercock turns the nose into the developing turn faster than the dihedral effect can roll the wings back level. The result is the spiral mode, which diverges slowly and is easily controlled but must not be ignored.

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