Discussion
An aircraft in trimmed condition has zero pitching moment at
Answer: B
A trimmed aircraft has zero pitching moment about its centre of gravity.
Trim means the aircraft flies in steady equilibrium with no tendency to pitch up or down. Rotation in pitch takes place about the centre of gravity, so the condition for trim is that the total pitching moment about the c.g. is zero, \(C_{m,cg} = 0\), with the tail or elevator setting chosen to achieve it.
The aerodynamic centre is the point about which the moment is independent of angle of attack; the moment there is generally not zero (it equals \(C_{m,ac}\)). The quarter-chord point is only an approximation to the aerodynamic centre of an airfoil, and 50% of the root chord has no special significance for trim.
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