[sanddrag]

We have a wide robot this year. We chose this configuration for driveability and maneuverability. While 6wd is better than 4wd for long robots, it isn't the be all end all of drive systems. We had 6wd with a long robot last year and it still didn't drive as nicely as a wide robot. Also, the rocking can be annoying.

This year, stability is not too bad because our wheelbase is still fairly long since we are using wheels that are just under 3.5" diameter. We still went with 6wd this year to get up the ramp and still have low ground clearance and small wheels, however, all of our wheels lie in the same plane; the center ones are not lower. It is the best driving robot we've ever had. Our CG is still low enough where it goes up the ramp just fine.

Anyway, my personal opinion is that wide robots drive the best. You can turn without loading up your motors too much.