Discussion
A ventral fin adds \( +0.02 \) to a derivative of \( +0.07 \). The improvement is
Answer: B
Correct answer: 29 per cent
The improvement is measured against the derivative before the addition:
\[ \frac{0.02}{0.07} \times 100 = 28.6\% \approx 29\% \]
The distractor 22 per cent divides by the new total of 0.09 instead of the original, and 350 per cent inverts the ratio. A ventral fin buys this improvement where it is most needed: mounted below the fuselage, it stays clear of the wing and fuselage wake at high angle of attack, so its contribution holds up in the very condition where the main fin's is falling away.
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