Yet the section modulus of the 2.875" x .25" wall tube is a
helluva lot bigger than my 2" x .375" mast.
It's that radius to the fourth power thing... For a given mass of
metal, the strongest column will be with the largest diameter and the
The caveat is that a wall that is too thin will dent, and then all the
assumptions about strength go out the window, because you've no longer
got a nice uniform beam in bending.
(practical example.. stand on one foot on top of an empty soda/beer can.
Then tap the side of the can. )
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