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Moment of inertia calculations

Started by Phathry25, February 15, 2016, 11:44:04 PM

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How much leeway should I allow myself when calculating these.  Is there a formula for calculating how much inertia to add due to outlying weight?  When I calculate them as a rectangle I end up with smaller numbers than the RX car.  And I am doing a 3,000lb truck.  So obviously I am not doing it right.  Should I just go by look and feel?

(Mass/12) x (Length2+Width2)  I suppose I should double check, but this is the right calculation, right?