Date: Sat, 20 Jun 2020 13:23:05 -0700
From: Grant Saviers <grants2@pacbell.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Stacked Yagis on Tower Legs
<I admit my statics expertise is a bit ancient but I don't understand the
<reasoning for the CW of attaching swing arms to multiple legs for
<"structural reasons". So educate me if my analysis is missing something.
<Grant KZ1W
## There was a note in qst years ago, where a fellow mounted a 4 el
40m KLM yagi to just one tower leg using Rohn-25 G. It was
fixed in one direction. It ripped the tower leg, sheared through, busted the
welds etc.
That was a huge windstorm, big ant..and a small tower, with small diameter 1.25
inch
tubing legs. And leg wall thickness is very thin.
## some angle steel, or angle aluminum, spanning an entire face..and on 2 x
faces,
clamped in 4 x places would ensure it all remains intact. Then repeat for
2nd brace.
Jim VE7RF
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