That one robot didn't just have 2 RCXs. Notice the NXT motors for driving. It appears 6 RCX motors were used to power the rotor and 2 NXT motors were used for drive. You can see the white NXT brick in the middle of the robot near the ground.
I have a few questions about how you did this set up! I would like you to e-mail me ASAP! Please and thank you! My e-mail is gmariah00@gmail.com thanks!
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What carnage - The Robot Chainsaw Massacre...
Josh