Discussion
Roll rate falls from 30 to 12 degrees per second as speed rises towards the reversal condition. The reduction is
Answer: D
Correct answer: 60 per cent
The reduction is measured against the original rate:
\[ \frac{30-12}{30} \times 100 = 60\% \]
The distractor 40 per cent is the fraction remaining rather than the fraction lost. The trend itself is the signature of approaching aileron reversal: aerodynamic effectiveness would ordinarily rise with speed, so a roll rate that falls as speed increases means wing twist is progressively cancelling the aileron, and the rate reaches zero at the reversal speed.
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