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RE: [TowerTalk] Rohn 25

To: "'Blake Bowers'" <>,<>
Subject: RE: [TowerTalk] Rohn 25
From: "Hank Lonberg" <>
Date: Sat, 29 Jan 2005 15:37:21 -0800
List-post: <>
Well you are correct in that it is shown in the consumer catalog and the
chart is dated 1987 and references 222-E. 222-F the latest standard differs
from 222-E. I would not bet on a 40' 25g and ever recommend that a client
use it unguyed. Your mileage may vary.

Hank / KR7X

-----Original Message-----
From: Blake Bowers [] 
Sent: Saturday, January 29, 2005 2:21 PM
To: Hank Lonberg;
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?


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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