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Old 06-12-2008, 01:58 PM   #6 (permalink)
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Actually you don't want the flywheel to be heavy: you want to make it out of a high-strength material like carbon fiber, so that you can spin it really fast. Getting energy in & out isn't a major problem: embed some magnets, and it becomes the rotor of a motor/generator.

There's quite a bit of research work going on in this area. Just do a search on "high speed flywheel".
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