[TowerTalk] Rohn Fold-over?

[TexasRF@aol.com]

In a message dated 12/8/2005 9:30:42 A.M. Central Standard Time,  
k6ll at adelphia.net writes:


----- Original Message ----- 
From: "Mike Bragassa"  <bragassa at consolidated.net>
To:  <towertalk at contesting.com>
Sent: Thursday, December 08, 2005 12:25  PM
Subject: [TowerTalk] Rohn Fold-over?


>
>  I  recently acquired a Rohn 25G  50 foot fold-over tower. I thought 
>  about using it at a place where I may have to be content w/ a lower 
>  height tower.
>  I cannot seem to find any data on the tower and am  curious from the 
> reflector group, if anyone has experience w/ the  tower and what 
> compromises there are VS: a conventional stacked 25G  tower, e.g how 
> big of antenna's or  stacking?
-----------------------
I've had one of these up for 28 years  now.

Data is in the Rohn catalog.

The main disadvantage is the  130 pound weight limit at the apex of the 
tower. Four way guying is  required, but the footprint is small. Use 
two levels of guys.

The  Apex is 25.5 feet above the hinge, which means the safe "moment 
about the  hinge" is 3315 ft-lbs (25.5' x 130#). If you are placing 
antennas,  rotators, masts, etc. at other than the apex, you can add up 
all their  individual moments about the hinge, and make sure the total 
doesn't exceed  3315 ft-lbs.

Dave Hachadorian, K6LL
Yuma,  AZ



Dave is right on the money here! I have seen many foldover tower failures  
(it is not a pretty sight) through the years due to this limitation and now the  
busted parts are irreplaceable!
 
73,
Gerald Williamson K5GW
Texas Towers