Discussion
An aeroplane recovers from a disturbance in roll only once a __________ has developed.
Answer: D
Correct answer: sideslip
Bank alone produces no restoring rolling moment: an aeroplane will sit at a bank angle indefinitely as far as roll is concerned.
What follows the bank is a sideslip, because the tilted lift vector no longer balances weight vertically and the aeroplane slides towards the lower wing. The dihedral effect acts on that sideslip, raising the lower wing's incidence and generating the restoring moment. The recovery is therefore indirect, which is why \( C_{l\beta} \) is defined with respect to sideslip rather than to bank.
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