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the fan is the wind so it makes the boat go forward. and then that energy is used to recharge the battery used to power the fan. this is getting too scientific.
This is groundbreaking. Finally something we can use as a possible outlet to solve our ever growing energy crisis. Yes, this is much to small to actually dig us out of our energy hole, but the possibilities....wow.
Well there is such a thing as perpetual motion, but not in the sense of generating energy as doing such would remove forces from the equilibrium and cease to be perpetual.