http://www.prime-mover.org/Engines/Torsional/contact1/contact1.html

Paul,
Some suggestion that the diameter of the shaft affects the Torsional
Vibrations, I only had a quick read, you may make more sense of it.
George ( down under)

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Sure! The larger the shaft the stiffer the torsion bar.
Here is how to calculate it.

Paul Lamar ...No rotor no motor.

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