[TowerTalk] Star guying

[w7xu at iw.net]

To clarify, the 2 additional long boom antennas are for 6 meters.  Their windload is
5.9 sq. ft. each.  Being at work, I don't have the wind area figure for the 30 m yagi
on hand, but I would estimate it at roughly 10 sq. ft.   While I haven't had a formal
analysis done, based on previous towers which I did have an engineering analysis
done, I wouldn't think a wind load of 21 ft. sq. would overload Rohn 55.  That being
said, there will be a significant amount of torque present with the long booms.

73,  Arliss  W7XU 


 On Fri Nov 30  8:07 , <donovanf at starpower.net> sent:

>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