Discussion
The tail arm is measured between
Answer: C
Correct answer: The wing and tail aerodynamic centres
The tail arm is the distance between the wing's aerodynamic centre and the tail's, since it is about those points that the moments are taken.
Using the geometric extremities of the aircraft instead would give a longer figure with no aerodynamic meaning. In preliminary design the arm is often approximated from the quarter-chord points of the two surfaces, which is close enough for subsonic estimation. The distinction matters because tail volume is linear in the arm, so a mismeasured arm mis-sizes the surface directly.
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