Discussion
A dorsal fin extends the effective stall angle of the fin from 15 to 25 degrees of sideslip. The increase is
Answer: A
Correct answer: 67 per cent
The increase is measured against the original value:
\[ \frac{25 - 15}{15} \times 100 = \frac{10}{15} \times 100 = 66.7\% \approx 67\% \]
The distractor 40 per cent divides by the new figure instead of the old, and 167 per cent gives the ratio of new to old rather than the increase. Physically, the dorsal fin works by generating a strong vortex along its swept leading edge that keeps the flow attached to the fin far beyond its natural stall angle - which is what preserves directional stability in a large sideslip.
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