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Looks like 2" square. .065 wall impulse welded tube to me. Not heavy at all, actually. It does look heavy but I recognize it from the crisp corners and the dark impulse weld line.
I agree, that a bit of triangulation would be helpful in stiffening especially where the narrower rear section meets the larger battery box section.
Dave would be able to say how much flex there is.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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