The tubing you describe sounds like the available suplus military tubing from a
camoflauge screening support system. I have some from a set (10 per bag). Is
this what you have?
-------------- Original message --------------
From: "Brian Machesney" <email@example.com>
> I need some help from the more structurally-oriented members of our
> I need to know if it is practical to erect a 75-foot vertical element from
> aluminum tubing that has the following dimensions:
> OD: 1.785"
> ID: 1.57"
> Wall: 0.11"
> Length: 48" overall; 3.25" suaged and shouldered to fit into the next
> Weight: 2.7lb
> I have devised a raising fixture that has allowed me to raise 45ft masts of
> this material alone and with ease. Will a 75ft element stand up, or is there
> serious risk of it buckling under its own weight? Of course, numerous guy
> levels will be needed - I'm planning on 5.
> Brian K1LI
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