[TowerTalk] Mast wind loading
ve5ra at sasktel.net
Tue Mar 28 18:20:50 EST 2006
You are to be commended for sharing your experiences and I
agree with your philosophy. A lot don't share their
experiences because they get chastised by people who throw
around words like 'unsafe'. Have these people ever heard of
'risk analysis'? Really...how much will your tower
withstand can only be determined by 'product testing to
destruction'. If your tower arrangement has survived for 25
years then IMO you have a safe installation. Great job!
Subject: Re: [TowerTalk] Mast wind loading
> Hi All,
I have been biting my tongue for years about the
theoretical load of Rohn
towers. It may be important for building code purposes and
surely is for
Rohn's litigation exposure, but in the real world it is
A properly installed and guyed Rohn tower will hold MANY
times more than
indicated in the catalogs. I look at the pictures of Rohn
25 with a single
beam at the top because of "loading' and I laugh. Here in
there are dozens, if not hundreds of big contesters with
for years without any mishaps, except for the ocassional 2
inches of ice and
50 mph winds together. My 100 foot Rohn 45 tower has a 15
foot, 3 inch moly
mast with a 4 element homebrew 15 meter beam on a 35 foot
boom and a 4
element homebrew 20 meter beam on a 57 foot 3 inch boom.
At 80 feet I have
a 2 element Cushcraft 40 meter beam, at 68 feet I have a
TH7DXX, at 50 feet
I have a homebrew 6 element 10 meter beam on a 27 foot boom,
and 34 feet I
have another TH7DXX, and at 70 feet I have a Ringo Ranger II
calculate the wind loading!! It's been up for over 25 years
problems. So, If you need official documentation, follow the
If you want to put up real antennas, just do it, but do it
right, no corner
cutting or compromises in materials. Just my opinion.
Perhaps you should have continued biting your tongue.
anecdotal observations are interesting but have no basis in
engineering practice. Sure, hams overload towers and, sure,
most of them stay up but
that doesn't mean that they are safe and reliable
Ignore the LXC Prime Directive to "DO what the
manufacturer says" at
your potential peril.
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