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Here's what you gotta do:
Take the 4 wheel drive and the center wheel drive systems and combine them into a 6 wheel drive system. Your turning problem will be solved by slightly lowering the center wheels. You'll have no worries about castors messing you up, either.
Just power the center wheels directly and connect the outer wheels to the center ones with belt or chain.
This is the most effective of the simple drivetrains. (I consider holonomic, swerve, ball, and tank drive to be complex.)
George
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George
"Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that."
-- Martin Luther King, Jr.
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