you dont need a 9 channel!!!!!!!!lord why would you? a 4 channel is good and a 6 isgood too....flipper bots are the best
or grapper bots...the ones with circular saws really dont do much...but one with a flipper that is really good can throw a bot out of the ring...its been done alot...or one with a claw on the front and low speed and high torque can easily grab one and push it into

"THE PIT" ive already figured out everytihng on my bot but its bein post poned ttill i learn c and java....right now im buildin a rover.