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To counteract some of the gyroscopic effects have 2 rotors spin up but in opposite directions. To make the CVT infinitely variable so it can be used from a stop insert a planetary gear set or power split device if you will. Look up IVT transmissions.
I was thinking of rigging up something like this in the trunk of my 2010 Prius working on the back wheels. The idea would be it would absorb the excess regen that the battery can't take and would supplement the acceleration when speeding up. This would allow those heavier on the brakes to capture more of the kinetric energy and the round trip efficiency would likely exceed the HV battery roundtrip efficiency. I'm also thinking about compressing nitrogen with a hydraulic gen/motor set up like Citroen in France are doing. For now it's just an idea.
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