Discussion
Consider the following statements about the horizontal tail:
1. It normally carries a download in trimmed cruise.
2. Increasing its area moves the neutral point aft.
3. It plays no part in setting the aft centre of gravity limit.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
The first two are correct. A conventional tailplane carries a download in trimmed cruise, balancing the wing's nose-down moment; and increasing its area strengthens its stabilising contribution, moving the neutral point aft.
The third contradicts the second. The aft centre of gravity limit is the neutral point less the required static margin, so anything that moves the neutral point aft moves the limit aft with it. The horizontal tail is therefore the principal determinant of the aft limit, not a bystander to it.
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