[TowerTalk] Vertical Antenna Tubing Strength (was: Increasingeffective 4SQR array bandwidth???

[Tom Rauch]

> Tom, wouldn't that make 20' sections of 4" irrigation pipe the
> material of choice for large (over 40') verticals? Only problem is, I
> have no idea what grade of aluminum they are made of. 73, Jerry

Very interesting Tom.

I am still trying to make 80 meter verticals that hold up well. I was 
thinking or irrigation tubing, but it is so soft and thin it scares me. I 
don't mind guying it, but installing the irrigation tubing seems to be 
a problem.

I was thinking of having Hygain send me boom material like 2" x 
.125 wall 6061-T6 swedged to fit the next section in nine 8 foot 
sections.

I didn't want to taper because of the shortening effect, and 
bandwidth reduction, unless I can offset that with a hat at top.

Is there software available for calculating stresses, or proven plans 
that work for an 80-meter vertical that is easy to erect?

73, Tom W8JI
W8JI@contesting.com 

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