[TowerTalk] Rohn 25

[Keith Dutson]

My catalog is the Rohn Ham Tower Catalog and there is no page 25G-1 (or 2).
The specs  for 25G in this catalog do not even list any loading info without
either guys or a house bracket.

Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Blake Bowers
Sent: Saturday, January 29, 2005 4:21 PM
To: Hank Lonberg; TowerTalk at contesting.com
Subject: Re: [TowerTalk] Rohn 25

Page 25G-1, and page 25G-2 of the Rohn consumer catalog.

Their design charts, their design drawings.




> Blake:
> I beg to differ with you.
>
> Using TIA/EIA 222-F wind loading criteria and 70 mph wind velocity (min.
> recommended) a 40 foot section of Rohn, 25g un-guyed and cantilevered 
> will develop a moment at the base of 7200 ft-lbs at the base. This is 
> without an antenna load, just the tower itself. The published 
> allowable moment for 25g ,by Rohn, with a 1/3 increase for wind 
> loading duration is 6,720 ft-lbs.
> At
> 40 feet it is clearly overstressed. How do you say that this is ok and 
> that Rohn fully supports this?
>


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