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I've said it before and I'll said it again: I like what you guys are doing. Keep up the good work!
By all accounts the goblins are a nice pair of guys and they have never made an obnoxious post here or been offensive etc. And I'm sorry if I seem a little short here.
I think folks should load test there frames, especially if they are for sale. This is required some places. With 2 200 lb. passengers and a 3 g vertical load that's 1200 lbs., plus some more for the engine and drivetrain. That's a bit sobering, easily 1500 lbs., I think the upper rails will complain about that.
Imagine being hit from behind, which has happened to at least a couple of our members. As the force is applied to the rear, the roll bar braces will push down on the upper rail, but the rail is not supported there. So this frame is not much stronger than the upper rail. It may fold there.
I'm sorry if this is upsetting or discouraging or whatever for these folks, but it is probably possible to fix this. I'm not sure keeping my mouth shut is the right thing to do here. I probably spent nearly a 1000 hours designing the Car9 frame and this stuff kind of jumps out at me now.