Which of the following is not a consequence of a floating elevator?
Answer: D
Correct answer: An increase in the tail's effective lift curve slope
A floating elevator reduces the tail's effective lift curve slope, by the free elevator factor. The surface moves with any change in tail incidence and partly cancels the lift change that would otherwise result.
The other three all follow from that reduction: the tail contributes less to stability, the neutral point moves forward, and the static margin at any given loading is smaller. They are one consequence traced through to its effect on the aft centre of gravity limit.
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