Discussion
Consider the following statements about the vertical tail:
1. It is often sized by the engine-out case on a multi-engine aircraft.
2. It contributes to directional stability.
3. It determines the aircraft's static margin.
Which of the statements given above is or are correct?
Answer: C
The first two are correct. Static margin is a longitudinal quantity fixed by the wing and the horizontal tail, and the fin has no part in it; the two axes are sized against quite different critical cases and share no reference length.
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