[Paul H]

-2 speed Killer Bee style shifter...~10 fps high, ~5 fps low.
-Folded aluminum sideplates.
-6 wheel drive. (The center wheel is fixed to the output shaft of the gearbox, and the outside wheels are slaved off of it. I used 6 inch skyway wheels for the model because I had them on my computer, I don't know what will end up on the real thing.)

This is really just the basic idea of a design that I've been thinking about for awhile, I drew it on my car ride to DC for the fourth. I've still got a bunch of work to do, but it should be pretty lightweight, and cheap/easy to build. We'll probably build a prototype of it in the fall and use it for practice next season.