pic: Team 980's arm hitting the stack at 2 seconds on clock

[DougHogg]

Originally posted by Kojib
Basically, very strong drive-train and dead reckoning. We are 3-WD, with Bosch drill motors locked into highest setting on front wheels with 4:1. Our Rear wheel is powered with both Chiaphuas. They drop into a helical gear set which sends a shaft through the center of the wheel (on bearings) into a planetary set (the sun, more specifically). We then simply bolt the planets to an aluminum hub we fabricated for the wheel, giving us 15.66:1. The entire rear assembly rotates 180' using a globe motor and a cable (it rests on 102 lycra ball bearings). As the rear assembly rotates, we slow down one of the front wheels to keep it from binding through turns. This gives us approx. 12 fps with enough torque to drag me (160 lbs, 5'8") lying down across carpet (also up the mesh and the HDPE, but I don't like repeating those experiments). All three wheels are 8" Skyway pneumatics inflated to approx. 17 psi.

Are you shifting gears to get that kind of speed as well as torque?

I gotta see the two Chiaphuas hooked up to one wheel. Very cool.

See you in Houston.