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Re: Bridge question
We have had the same experience. We had to add >110lbs to get the dynamics demonstrated in the video. Our engineer mentors (I'm not an engineer) tell us it does not matter where the weight is so long as it is evenly distributed relative to the center line. We proved that by testing with the weight all on the center of the bridge versus at the ends - same result in the 2-battery test.
As for the tipping point being different in one direction than the other, we found two problems with our bridge:
1. Note that the non-hinge side of the 2x4s on the bridge itself (not the base) is at the bridge center line, i.e. the 2x4 is off center. The first time we put the bridge on the base we had it backwards, which gave us a very out-of-balance bridge.
2. Pay close attention to the hinge mounting detail in the drawings. Notice that the 2x4 member on the bottom of the bridge itself is not flush with the edge of the hinge plate. We had our's mounted flush. We moved it ~1/2" outboard and got a much closer match of 2-battery test tipping points on the two ends of the bridge.
Now we just need to figure out how to safely mount >100lbs on the bridge in a removable manner.
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