Discussion
The horizontal tail volume coefficient is defined as
Answer: A
Correct answer: \( V_H = S_H l_H / (S \bar{c}) \)
The horizontal tail volume coefficient is
\[ V_H = \frac{S_H\,l_H}{S\,\bar{c}} \]
It is dimensionless because the numerator is an area times a length and the denominator is the wing area times a length. The mean aerodynamic chord is the right reference because the tail's business is pitching moments, and pitching moments are non-dimensionalised on \( \bar{c} \). Area ratio alone ignores the arm, which matters as much as the area; the arm alone ignores the area.
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