Quote:
Originally Posted by pfreivald
We weighed our bridge down more than was necessary and used the FP motor and gearbox -- not only would it tip the bridge, the bridge barely slowed it down.
Mind you, we haven't yet used it on an actual competition bridge (and that, as usual, makes me nervous), but it seems to have well more than enough torque to handle the job. (Of course, the length of your moment arm matters, too!)
Might I suggest that you do the math?
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The video said 28" to 30", so assuming 29" is the tipping point, 26" is the effective tipping point (CoG of battery isn't at the end). Keeping in mind that the bridge rotates on the edges of the bump and not the exact center, subtract another two more inches to get 24". Two batteries are 27 lb. That gives 27 lbf * 24" * (1'/12") = 54 lbf-ft = 648 lbf-in.
However, because of the double hinge, it's not a perfect lever, so aim for a bit more than that.
(88"/2) - 2" = 42"; 648 lbf-in / 42 in = 15.4 lbf, so approx. 16 lbf to tip.