[TowerTalk] DX Engineering 66-Foot Vertical?

[Rick Karlquist]

Hank Lonberg wrote:
> All:
>
> steel transmission and substation structures is 1.5 x the
> larger diameter( ASCE Manual No. 72). This assures full
> transfer of the bending moment and shear via contact stresses

In my extensive experience with irrigation tubing, I have
found this to be quite adequate.  Plenty good enough that
if you stress the joint, the tubing will buckle instead of
slipping out.  In terms of things to worry about, this
is not even in the top ten for me.

Rick N6RK