I have an idea on how to solve this, and I know what the answer is, but if someo

Question

I have an idea on how to solve this, and I know what the answer is, but if someone could show me how to work it out, I would be very grateful. Thanks!

2. Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (Mach 1). Taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 ft/s as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.

Explanation / Answer

v = r = r*2f

1100 ft/s = 3ft * 2 * f

f= 58.4 revolutions/sec

f= 3501.4 rpm

Conclusion:

Enough attention was not paid to a consistently smooth rotation and the location of the green disk with respect to the indicator ring. Consequently, the incorrect speed of rotation leads to the unacceptable percent discrepancy between the measured value and the calculated value in dataset 1. The situation improved with each data set and the 3rdwas the best reading.

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