Discussion
At a true airspeed of \( 130 \ \mathrm{m/s} \), the propeller of the previous question has a resultant tip speed of approximately
Answer: A
The two components are perpendicular, so the resultant is \( \sqrt{214^2 + 130^2} \approx 250 \) metres per second. Compressibility losses begin well below the speed of sound, which is why the margin matters even at this speed.
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