[techtiger1]

Yes your right in theory, the lighter the rotating object is the less energy is used to spin it (in this case) making the whole system more efficient. What I am asking you to do now is to put the principle in practice I think you'll find that in a application for FIRST where components are generally light (not a steel vs. alumnium flywheel) you will see only a slight diffrence in proformance but a difference none the less. Good ideas really everything you've said has a viable point.