Discussion
Banking an aeroplane produces a restoring rolling moment by itself. True or false?
Answer: C
Correct answer: False, the restoring moment comes from the resulting sideslip
An aeroplane at a bank angle feels no rolling moment from the bank itself. What follows is that the tilted lift vector no longer balances weight vertically, so the aeroplane slips towards the lower wing.
The dihedral effect acts on that sideslip, raising the lower wing's incidence and generating the restoring moment. So a restoring moment does appear - the second option is too strong - but by way of the slip, and dihedral acts on sideslip rather than on bank whatever the sweep.
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