Discussion
Consider the following statements about lateral stability:
1. It is measured by the rolling moment produced by sideslip.
2. A negative rolling moment derivative with sideslip is the stable case.
3. Banking alone produces a restoring rolling moment.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
The first two are correct. Lateral stability is measured by the rolling moment sideslip produces, and the stable case is a negative \( C_{l\beta} \) - a right sideslip giving a left rolling moment.
The third is false, and it is the point the whole subject turns on. Bank alone produces no restoring moment; it produces a sideslip, and the sideslip produces the moment. That is why the recovery is indirect and why the derivative is defined against \( \beta \).
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