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Re: pic: FRC 2869 - 2016 Shooter
A flywheel does not have to be heavy, to be able to store energy/momentum. The speed of rotation is also important as well.
Just look at Formula 1 Racing Flywheel System. They use 240 mm diameter flywheel which weighs 5 kg and spins at around 64,500 rpm. They can store enough energy to give a power boost of 60 kW for 6.67 seconds.
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