Has anyone ever created a full-sized windup (clockwork-powered) car?
I understand that it would be a monumental undertaking for most of us here, but still I was wondering if anyone on the high-school engineering level or higher has ever attempted to build a vehicle that could carry a minimum of two people sitting side by side, travel for 50 miles at a speed of 35-40 mph over undulating terrain? How practical would this be? How big or heavy would it be? How would you go about rewinding the mainspring so that you're not tiring yourself or your teammates out AND not contributing too much to the current pollution levels?
If someone has attempted this, have you posted your results? I would love to see them.