Discussion
Consider the following statements about tail volume coefficients:
1. The horizontal coefficient is normalised on wing area and mean aerodynamic chord.
2. The vertical coefficient is normalised on wing area and span.
3. The two coefficients are directly comparable in magnitude.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
The first two give the definitions correctly: the horizontal coefficient normalises on wing area and mean aerodynamic chord, the vertical on wing area and span.
The third is false, and follows from the first two. Because the span is much larger than the mean chord, the vertical coefficient's denominator is much bigger, and typical values differ by an order of magnitude - around 1.0 against 0.08. A fin is not undersized for having a small coefficient; the two numbers simply measure against different references.
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