[TowerTalk] Star guying

[donovanf at starpower.net]

Arliss,

I'm concerned that you may be building an overloaded tower! Have you
analyzed the loads on your 190 foot tower from the additional long boom
(50') Yagis you're planning to install?  

If you don't have the software to perform your own load analysis,
KR7X (a member of this reflector) can perform detailed load analysis
for far less than the cost of replacing an overloaded tower.

While star guying reduces torque, it does so at the expense of
significantly increased vertical loading on the tower legs.  Star guyed towers often use tower sections with solid legs that can survive the
additional load caused by star guying, particularly if star guying
is used at multiple guy levels.

73
Frank
W3LPL

---- Original message ----
>Date: Fri, 30 Nov 2007 03:11:23 -0600
>From: Arliss <w7xu at iw.net>  
>Subject: [TowerTalk] Star guying  
>To: towertalk at contesting.com
>
>I have a question about star guying.
>
>This fall I erected 170 feet of Rohn 55.  The tower is mounted on a pier 
>pin with a tapered base section.  I have another 20 feet to go, but due 
>to weather, that will have to wait until next spring.  The only antenna 
>on the tower at this point is my full size 3-el 30 meter beam at 100 ft. 
>  After completing the tower, I plan to put long boom (50') yagis for 
>other bands at 160 and 190 ft.
>
>Even with just the 30 m beam on the tower, the tower exhibits a modest 
>amount of twisting at the 100 ft. level. when the wind blows (which is 
>most of the time here on the Great Plains).  I'm thinking that star 
>guying at one or more levels would help reduce the torque.  However, 
>since I haven't used star guying before, I don't know if I should just 
>do this at the 100' level, the 190' level, or both.  Suggestions?
>
>Thanks and 73,
>
>Arliss, W7XU
>
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