For a 150' tower, I would try to find a structural (not a civil) engineer in
your area and pay him to analyze the loads you want to support on various
towers you are thinking of using.
Do you ever get ice in your location? Do the 70' trees deflect some of the
wind? These are details an engineer needs to look at.
73,
Steve
N6SJ
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Chris
Hoelzle
Sent: Sunday, April 03, 2016 5:21 PM
To: TowerTalk@contesting.com
Subject: [TowerTalk] Need help with tower info
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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