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Do a web search about flywheels.
There is some really interesting research using large flywheels as energy storage devices.
Think regenerative breaking where slowing down transfers energy into a big flywheel. It spins very quickly. The energy could then be transfered mechanically back to the wheels again, or could run a generator/motor to drive the car.
Really interesting stuff, wish I could think of a good web page about it.
Now this is not a flywheel as in the thing at the end of your engine. It is a HIGH RPM device made of fancy space age stuff.
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