Discussion
A fin of \( 9 \ \mathrm{m^2} \) sits \( 11 \ \mathrm{m} \) behind the centre of gravity on a wing of \( 70 \ \mathrm{m^2} \) and span \( 28 \ \mathrm{m} \). The fin volume ratio is
Answer: A
The ratio is \( (9 \times 11)/(70 \times 28) = 99/1960 \). Values around 0.04 to 0.07 are typical for transport aeroplanes, and the span is used as the reference length because yawing moments scale on the lateral dimension.
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