From the video, it appears to be tipped with minimal weight, suggesting the CoG is not far below the pivot point. “Level” is ~2.5 degrees of horizontal, returning from 15 degrees. I assume there’s no damping of the pivot. Getting it to passively settle to “level” after the third hundred-pound robot moves onto it seems like it would take awhile.
Anything else?
If you look at the field drawings, it’s not a simple hinge. There are two pivots, so it pivots around a different axis depending on which way it’s tipping. I don’t recall the exact statics analysis, but that gives you a larger “dead zone” (range of torques which do not produce a rotation) than would a simple pivot with a counterweight.
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