Discussion
The moment arm between the wing and tail aerodynamic centres is the _____.
Answer: A
Correct answer: tail arm
The tail arm is the distance between the wing's aerodynamic centre and the tail's, and it is the lever through which the tail's force becomes a moment about the centre of gravity.
It appears in the numerator of both tail volume coefficients, so a longer arm buys tail volume without tail area - the central trade in empennage sizing. The mean aerodynamic chord is a wing reference length, and the neutral point and static margin are longitudinal stability quantities rather than geometric distances between surfaces.
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