[Jeff Waegelin]

Our drivetrain was just a single-motor unit, but it worked remarkably well, and we never had a single problem with it. We used a combination of free-spinning gears and locked-down gears with a shifting collar to achieve a 5:1 and 10:1 reduction, followed by additional sprocket reduction. I've attached a picture, but if you want more info, post a question, or PM me.

All the gears were purchased through gear vendors with the exception of the center splined gears. Those are part of a driveshaft gear from a car welded to a normal gear. The collar is made from the mating piece to the splined gear, and is shifted pneumatically.