The tractor pull challenge is to construct a robot that will push or pull the most weight 50cm in a minute. Basically, for the tractor pull, high gear ratio is needed for more strength, and it is needed to add more weight on the robot so that the wheels have more grip which helps use whole energy transferred to the wheels.
For the robot of our team, since we decided it to push the weight, I added some tricky device to keep the weights from moving aside. NXT was, of course, moved to the back, and one more motor is added at the back for more grip and for deco. By the way, the gear way is 40:8 which is reverse to the gear ratio used in the drag race. Until now, the maximum weight the robot could've pushed is about 3000g.
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