Quote:
Originally Posted by Ether
BTW, how did you use the GoPro to measure speed? At 5000/4.67 RPM, 1/120 of a second is 1/7 of a rev. Did you put a circular protractor on the output shaft?
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Once, when we wanted to determine RPM from a video, we counted frames per revolution and divided that into frames per second. (Doing it over several revolutions gives a much more precise number.)