Discussion
Statement I: A surface that floats with the local flow reduces the effectiveness of the tail it belongs to.
Statement II: A floating elevator reduces the tail's contribution to pitch stiffness, so the stick-free neutral point lies ahead of the stick-fixed one.
In the light of the above statements, choose the correct answer.
Answer: B
Both statements are correct and together they are the whole of stick-free stability. When released, the elevator floats up as incidence rises, unloading the tail and so reducing the restoring moment the tail would otherwise supply. The consequence is a forward shift of the neutral point and a smaller static margin with the stick free than with it held. That is why certification examines both cases and why the free-elevator factor appears in the tail contribution.
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