This is for the contest of the T shirt, but also it's for me.
I never understood how this machine works, and it burned my imagination.
At first sight the Boulder Mobile it seems to work by brute force: kick the head with the stick club to gain speed. Stop punching tho decrease it.
But now I'm looking at the design of this boulder and maybe, maybe this two guys known something: They know electricity!!
How a petrol motor could fit there? An electric one can!