This was a last-minute attempt at the August 2011 Technic Challenge of building a "record-breaker." It was supposed to be the smallest working RC Scraper.. not sure if its the smallest but it certainly does work. I entered it the night of the deadline - I don't even think it submitted.. oops
Two XL motors drove the front and rear axles and an M motor drove a linear actuator that would bend the scraper at its center hinge, thereby steering it. Two M motors in the rear controlled the lifting of the scoop and the scoop lid.