[TowerTalk] Max height of aluminum tubing mast?

[N7KA at comcast.net]

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?

Arne N7KA 


-------------- Original message -------------- 
From: "Brian Machesney" <nekvtster at gmail.com> 

> I need some help from the more structurally-oriented members of our 
> fraternity. 
> 
> 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 
> section 
> 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. 
> 
> Thanks, 
> 
> Brian K1LI 
> _______________________________________________ 
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