wrote in message
...

I found a local shop that has the 4130 tube. Kinda pricey stuff, but to
keep costs reasonable what wall thickness do you think would do the job?
1.5" with 3/8" wall is about $18/ft. I don't think I would need that much
wall thickness but I really have no idea?

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I'm not a professional engineer so I can't design for you, and if I was one
I wouldn't work for free.

You can search for sites like these:
https://www.flagandbanner.com/flag_b..._flagpoles.asp

https://www.engineeringexpress.com/calculators19/