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We used 4 total suction cups, two on either side, in pairs.
They deployed by a pneumatic cyclinder (on on either side), the cups were 3 (or 4) inches in diameter, and held us on the ramp every time we were on, the reason for this was our second drive (tourque boost) dropped down and worked to hold us from moving once we were in the position we wanted to be, if someone tried ot push, we gave a little push in the opposite direction, making it impossible for them to move us off.
The suctions made it so we could last ditch effort deploy in the final seconds, we'd get speed going up the ramp and hit the suction as soon as our front wheels were on the HDPE, we'd slide into a perfect place, just as the clock ran out, we hit to too late once, and the tip of our suction cup was off the edge, just barely being out of 25 points, it was quite close.
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