[TowerTalk] 40 Meter Vertical Construction

[Joe Reisert]

Gordon,

One of the "rules-of-thumb" used with tubing is to overlap 2-3 times the 
diameter of the element. Therefore, 5" is great on 1.625" tubing while only 
about 2-1/2" is needed on the .875" diameter tubing. Of course, more is OK 
but from an economy and weight perspective, less is better!

73,

Joe, W1JR


At 05:17 PM 11/7/2003, Macie, Gordon wrote:
>I am building a 40 meter 4-square. I have decided to build it with aluminum
>from Texas Towers. The bottom section will be 1.625 and reduce 1/8 per
>section above that with the top peice being .875. How much do I need to
>overlap or telescope into each section for mechanical strength ??.. I am
>thinking 6 to 12 inches.
>
>Blurb below from Texas Towers web site.
>6063-T832 Drawn Aluminum Tubing
>Typical yield strength of 40,000 psi. The chart shows all available
>telescoping sizes which are specifically designed to fit together precisely,
>making antenna construction easy, while offering professional results.
>
>
>Gordon N4LR
>n4lr at arrl.net
>
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