Julio:
I don't totally agree with all your statements regarding top rails. I've used
them very successfully in the past. Since this goes back a few years, my
memories a bit fuzzy. But, I seem to recall that there might be a heavy duty
top rail which is "just slightly" under 2 inch OD and not much smaller as you
mentioned. I'd have to go out back and measure one to determine the actual
size.
In several cases, I used 12'ish foot lengths for yagis mounted at the top of
the tower with the rotor recessed 10 foot into the tower. In one case, I had a
full 20 foot length with a custom-turned insert placed down into the top rail.
This one had a big 6 element 10 meter beam on a 3" boom at the very top (10
foot out of the tower). I can't count how many ice and snow storms that combo
survived.
If any mast material's overloaded, it will bend. Doing the analysis is the
first best step.
73 charlie, k1xx
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