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Critical Speed

Most materials have a natural frequency, just as each string on a guitar has its own tone. The natural frequency of tubing material results in a particular critical speed for that shaft, based on its length, diameter, thickness, and composition.
As the tubing approaches critical speed, the tubing will begin to vibrate.
At critical speed, the tubing may “whip” causing it to break. Driveshaft length, engine rpm and transmission gearing must be considered when selecting a driveshaft.