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I am in the process of designing a brake inertia dynamometer to test one complete corner of a car's braking system.

I'm having some trouble with what size the spinning disc of metal, that will simulate the energy of the moving car, needs to be. I have the inertia value that I need to simulate (roughly 2000 kgm/s)

I also have a formula to calculate the moment of inertia for a cylinder but i have a feeling that these are two different things.

So any help with how I can calculate the size and mass of the disc and also how I would calculate the speed it needs to be rotated at.

Cheers

Oli