> From: Grant Saviers <grants2@pacbell.net>
> Angles are a bad structural form to use as a cantilever beam. I & WF
> beams, round tube/pipe, and square/rectangular tube have FAR more
> resistance to bending and twisting per pound of steel.
Correct.
Please check out my spreadsheet at
https://na6o.com/main/Amateur_Radio_files/Cantilever_beam_stress_calc.xlsx
Scroll down the long list of different structural shapes and sizes, looking at
the STRESS columns. You’ll quickly see which shapes and sizes will give you a
safety margin, and which are most efficient in terms of strength/weight ratio.
If the stress is 10 KSI or less with the maximum expected force, you should
have a large safety margin, no matter what kind of steel is used.
-Gary NA6O
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