Overpass rigidity?

[Kims Robot]

We actually made our full track completely out of PVC (trying to save some money & weight), but when we stood it up it sagged, so we bought some cheaper and lighter electrical conduit 1" diameter to brace the insides. Before putting it in the overpass (with all the pieces glued & or pinned) it seems to hold together pretty well. We ran the robot into it a few times, bounced the trackball against it and several other abusive actions, and it seemed to stay together, so it seems to be a reasonable modification to the design.

[SSMike]

We built an overpass out of PVC to test designs. As Kim said, PVC is cheaper and easier to assemble. We found out that the design isn't as stable or rigid as aluminum or steel, but we mad due. All you would have to do is have two people hold the "legs" of the overpass. When thrown or placed on the overpass, the trackball does cause it to move slightly, which won't happen during an actual competition. That's just something that we will have to take into account.