They should replace the lawnmower blades with an inverted fan blade.
>the chaparral 2j would literally suck itself onto the track, like a vacuum, giving itself unparalleled traction. (was later banned from racing)<p><a href="http://antholonet.com/EngineersCars/Chaparral2J/Chaparral2J.html" rel="nofollow">http://antholonet.com/EngineersCars/Chaparral2J/Chaparral2J....</a>