[TowerTalk] irrigation tubing

[vhfplus at bmg50.com]

Boy, Rick, I wish I could find a local source of even 3-inch stuff. It is
very odd that no one in northern Nevada (Yerington, Silver Springs, Fallon
area) seems to handle aluminum irrigation tubing. I have called a supplier
in Reno but never received the courtesy of a return call. Used stuff would
be fine if it were available.

Jack, W6NF

>
> Nothing wrong with that at all, in fact my first 90 ft mast was
> all 4 inch.   But I have since found that I can get away
> with 90 feet, where the bottom 30 feet is 4 inch 0.050 wall, the
> middle 30 feet is 3 inch 0.050 wall, and top 30 feet is 2 inch
> 0.050 wall.  I raise it with a 30 ft falling derrick made of
> 4 inch tubing.  There is a lot of strain at the joints, so I
> developed an extra strong joint design to handle it.  I got
> most of my tubing used, and around here, all the stuff is 0.050
> wall, since the way it is used is to just lay it on the ground.
> They don't do those circle things here.
>
> Note that going to thicker wall doesn't help with sag during
> raising, since the extra weight cancels out the advantage of additional
> thickness.
>
> Rick N6RK
>
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