Discussion
Statement I: An aeroplane has no natural tendency to return to wings level from a bank alone.
Statement II: Lateral stability acts through the sideslip a bank eventually produces.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true, and together they explain why lateral stability works indirectly. A bank angle alone produces no restoring moment: the aeroplane is happy at any bank until something else changes.
What changes is that the tilted lift vector no longer balances weight vertically, so the aeroplane begins to slip towards the lower wing. The sideslip is what the dihedral effect acts on, producing the rolling moment that raises the wing. The chain runs bank, then slip, then roll - which is why \( C_{l\beta} \) is a derivative with respect to sideslip and not to bank.
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