Re: Lightened Flywheel?
For the disk, the mass is proportional to the area. The area of the original disk is pi X R squared. If you reduce the diameter of the disk by machining it to half the diameter, the area is pi X (R/2) squared or 1/4 of the original. So the inertia of the machined disk is 1/4 x 1/4 or 1/16 of the original.
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