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It's not hard or expensive to build a robot that travels up stairs. With the tri-star design all you need is 12 small tires, roller chain, and some sprockets.
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It's A LOT harder than it looks to do what you're saying. Many forget, but FIRST did try a stair type object in 99. It was the puck. Just the stair moved which made the game even cooler!
Our team was the only team that year, to my knowledge from all the 300+- teams I saw at nationals that actually pulled off this triwheel design. We only had them on the front wheels though. It took most of our design and building time just to build them and since there was more materials, wheels and more sprockets that went into creating that, it obviously cost more than a regular drive.
Stairs that move again, that'd be really cool thing for FIRST to do.
