about how Drive Train push the robot... shouldn't the force accelerate the robot?

[Patrick Wang]

I have never seen a twin drill motor drive stall when the drill motor is set in low gear and running anywhere between 2:1 or 3:1 gear ratio with an 8 inch wheel.

Usually the case is, when two robots are pushing against each other, the frictional force between the wheel and ground is overcome before the stall torque of the motor.

If you're running in high gear on the drill motor, that's another story. Generally, (especially when you're trying to tow two goals up to balance) the motor stalls when you begin to climb the ramp.

I don't know how exactly would be the best way to find the best combination of frictional force and weight. With a lighter robot, you can accelerate and acheive a higher top speed. On the same note, you do not have as much mass to push other robots around with and the frictional force when you are climbing a ramp or bridge is less than it could be.

The design challenge for us never came to this point however, we were always 130.0 lb. (haha)