marcoloca wrote:hassenplug wrote:I would connect the motor to the middle hub to give it good ground clearance, but only if the track goes around 90 degrees of the hub. Less than that, and it may slip.
Sorry, I don't understand "goes around 90 degrees of the hub"...
The track needs to touch the hub (wheel) for at least a quarter of the hub - look at this picture:
Here, 1 and 4 would be good places to attach the motor, but 5 and 6 would be bad choices, because there is too little contact between hub and track.