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@Dammit
Forgive my limited understanding of these things (GCSE Physics) but surely it is impossible to get 50 times the energy out of of a mechanism than you put in?
So I would have to assume that there is another source of energy being used here- presumably the pedalling powers a generator that tops up the battery, but this means that at some point it is going to run out of zoom, at which point it looks pretty heavy.
I am ready and waiting to be proved wrong however- after all cold fusion did work for a few days.