so, i have been trying to design a lighter chassis than this years robot (at ~60 lbs) and i came up with this:
by my calculations, it will move at 14.82 ft/sec high gear and 5.79 ft/sec low gear. i have also figured the weight to at at around 45 lbs.
and just for future reference, 1x2 8020 weighs about .98 lbs/ft, and 1x2x.125 aluminum weighs about .88 lbs/ft. not much of a difference when the strength is taken into account.