early on we created a 'speed trap' using the optical sensors and an oscilloscope (measured how long the bot frame interrupted the beam as it went past)
with the drill motors locked in the high speed position, our bot was going fast. I just checked my notebook and I cant find the exact speed, but Im sure it was over 20mph - maybe as high as 25mph
mind you, the load was so high the bot would not go from a standstill by its self. We had to give it a push to get it going.
This was really all an accident - it was the first time we had driven the bot, and just happened to have the drillmotors locked in high gear instead of low.
Obviously we didnt use it that way in competition - but to get back to your question
the only thing that would limit the top speed of the bot is wind resistance, friction on the wheels and drive train, and the fact that the field is only 60 feet long. If you have a multispeed transmission, and a long enough 'runway' - then you could get one of these things going pretty quick
just like a radio control car: :c)
now im not saying you could get a FIRST bot going fast enough to jump over your house - well, maybe you could. watch the linked video and you decide !
http://showcase.netins.net/web/isuguy/housejump.wmv