[gabi]

i did this a couple of days ago,
realy fast and easy, i used an empty botle of mouthwash split in half attached with tape to the back wheels' cover

the idea is that the wheel is spraying a jet of air upwords that will hit the coanda device and provide thrust (forward)

now i'm not expecting much at all, any significant amount of thrust will rip the tape of for sure, but up to 5 lb of thrust maybe possible....who knows

i havent got to highway speeds yet, just 55 mph top speed so far .
cant really tell somthing's there to it....will see