Im about to get some DC motors from radio shack and build a $10 all terain car for a race im about to be in. Th race is located in my neiborhood, but the rules are no control over the car at all. That means you start it and let it go straight for about 1/2 block in all turains , water, sand ,dirt,street,grass,and and rocks. This is one of my minor play around projects.