ambush_xx you are going the right path right now. think about the ways for now, and design a few, mindstorm, dont think if it possible or not, or if its efficient. Just design. Slowly cancel out the weaker ones and start analyzing each one.
Actually, using just breaking to wind up a spring to actually climb a slope is like a windmill connected to a spring which winds up when the windmill is running and then when there is no wind the spring pops in action to turn the windmill to generate electrcity, this goes against energy conservation (0'th law of thermodynamics). I still think I am wrong so someone d the math please. This topic is interesting though!
