A 22-year old college graduate in New York has adapted hybrid car technology to a bicycle. He uses a fly-wheel to store energy generated by the brakes for use when the riding gets tough. The engineering student's fly-wheel bicycle employs the same energy alternating principles as a hybrid car. But rather than a battery, it uses a fly-wheel to transfer and store kinetic energy, which gives the bike a boost in speed. To build the technology, he began with a 15 pound, cast iron fly-wheel taken from a car engine, mounted the fly-wheel in the center of the bike frame, and attached it to the rear wheel through a continuously variable transmission.
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