Quote Originally Posted by k_c_r
Sorry, I should clarify. I won't be switching mid-spin; if the robot gets flipped I'll bring the weapon motor to a stop, change over two of the motor wires via the relay, and spin up again, so I'm just looking at a small setup similar to this:
The theory is that I'll be able to do this while driving about and avoiding the opponent's weapon/the pit. Chances are the reality will probably be a lot less successful
You still will need a relay which will handle the current draw though

Obviously you can use a slightly lower rated relay because you aren't using it to disconnect the current - though if you do you'll probably end up welding the contacts - but a usual 30/40A automotive one won't hold up for long.

Maybe just run it in one direction and hit something to flip you back over? Remember that with your tooth design you won't really deal any damage spinning in the opposite direction...