[TowerTalk] 40 Meter Vertical Construction

[Jim White, K4OJ]

FOR ME

I would step down the overlaps as you went yup - start with a longer 
overlap say 1 foot and decrease it by and inch or two with each 
downsizing...

The cumulative mechanical needs of the tubing are less as you go up - at 
the bottom all of the tubes are attached to the bottom one... the top 
piece does NOT have anything "after it"

CAUTION NO ENGINEERING CREDENTIALS ONLY A LIFETIME OF EXPOSURE TO 
AMATEUR RADIO

K4OJ



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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