I feel like trying to make a pair. I think they use eletric or air powered motors because of the noise. Its not a loud sounding motor but more like a fan motor. Yes they may be micro-motors but still.
I think that if there was a device that turns the movement of the axels and wheels into energy that can recharge and power up the motor. Like for each foot the wheels or axle spin they send enough energy to go another foot into the motor and back and forth. A push-pull method. I may have years till I get up to the level I need to beable to do the required equations to understand what weight, size, and the power needed to order a single screw of this would be but I know that some day it will become a reality and I will have helped to make it.
