Just curious what oddball drive trains have been out there.
5484 this year went with a 2 center wheels with 4 ball castors on the corners.Gave us very fast spinning and pretty decent torque to push with. It also made it extremely squirrelly to drive. We had to utilize a gyro updating every 1/20th of a second to keep it on course.
By the end of the season we had it so that it worked pretty well, but I am not sure I would recommend it to anyone. It was pretty unique though. Loved seeing the incomprehension on scouts faces when they asked “what type of drive train” and we told them 2 wheel. (they all wrote down tank, <sigh>)