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I am under the understanding that stiffness goes up with the square of thickness, so that a 3mm sheet of ally would be nine times stiffer than a 1mm sheet, and three times stiffer than 1mm steel at the same weight. Is this not true for sheet? (Oh boy would I have to back and do some new math!)
What are those pieces in your picture a part of? They look like they could be stiffeners in the side pods of that 25 above.
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