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A coworker of mine did a few years ago. Not pretty. He was ok, though.
I like the idea of the flywheel, if mounted horizontally. The only practical issue would be hills. Safety issues are safety issues, but let's assume that safety wasn't the issue. Who's a math major around here? What size and mass of disk rotating at what velocity would be required to move a city bus from a stop? What would the best methods of energy transference be for both energizing the disk and providing motive force to the vehicle? Would it be worth it?
I can see this being one of the many possible solutions for hybridization of buses and delivery trucks that stop and go frequently and don't do too much mountain climbing.
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