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Free energy mod!
(startrek.website)
A place to post ridiculous posts from linkedIn.com
(Full transparency.. a mod for this sub happens to work there.. but that doesn't influence his moderation or laughter at a lot of posts.)
That's just regenerative braking on a bike. Without batteries.
In theory that idea isn't actually bad although I suspect in practise the mechanism would be extremely complicated and would be liable to jamming it in opportune moments. That said doing this electronically is already a thing, although not really in e-bikes.
pretty sure hybrid cars have regenerative braking - the car uses the motion to recharge the battery when braking, going downhill, or coasting