Discussion
An aeroplane rolls at \( 0.6 \ \mathrm{rad/s} \) with a semi-span of \( 14 \ \mathrm{m} \) at \( 70 \ \mathrm{m/s} \). Its helix angle is
Answer: A
The helix angle is \( pb/2V = 0.6 \times 14/70 = 0.12 \) radians. Certification requirements are written in terms of this non-dimensional group rather than roll rate, because it captures roll capability independently of size and speed.
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