Discussion
Assertion (A): Lateral stability is defined against sideslip rather than bank angle.
Reason (R): Banking alone produces no restoring rolling moment.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is precisely why the first must be so. An aeroplane at a bank angle experiences no rolling moment from the bank itself; it will hold that attitude indefinitely as far as roll is concerned.
What the bank does is tilt the lift vector so that it no longer balances weight vertically, and the aeroplane slips towards the lower wing. It is that sideslip the dihedral effect acts on. So the derivative that defines lateral stability must be taken with respect to \( \beta \), there being nothing to take it with respect to in bank.
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