That is a pretty high wind speed. Rohn specifications assume two 1/2 feed
lines per leg. I assume that this allows some windload not in included the
10.4 sqft. I have a Rohn 65 tower and I really like it. Rohn also makes a
solid leg 45g tower which is significantly stronger than tube version.
John KK9A
To: <TowerTalk@contesting.com>
Subject: [TowerTalk] Need help with tower info
From: "Chris Hoelzle" <choelzle@cox.net>
Date: Sun, 3 Apr 2016 17:21:24 -0700
Hello - I am intending on putting up a tower at my new home in Bandon, Or. I
have 40 acres and it is surrounded with 70 foot high timber. When I saw the
layout and I thought I would put up a 150ft tower. I will not be doing this
often, so I want to put it up once and have it stand. General TIA wind
ratings for the county are 80mph, with "special areas" - and of course I am
in one of those special areas which has ratings of 110mph.
Right off the bat I excluded putting up a Rohn 25G, opting instead for a 45G
- but then a buddy of mine said that he would go for a 55g.
I intend on putting up a big M2 or Mosley multi-bander (15sqft) and a 40
meter three element (20 sqft).
I know of folks that have these sorts of setups, but when I take a look at
the Rohn wind load I was really surprised.
A Rohn 45 150 foot 130mph rev G / 110 mph Rev F shows it will only allow
10.4 sqft of load.
So, I thought a Rohn 55 would do the trick but it shows:
Rohn 55 150 foot 130mph rev G / 110 mph Rev F shows it will only allow 16.6
sqft of load.
Are the specs WAY too conservative or should I put up a really HUGE tower to
accommodate what I want to do?
Any thoughts on my conundrum would be greatly appreciated.
NN6CH
Chris Hoelzle
choelzle@cox.net
Laguna Niguel, CA
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