[TowerTalk] Star guying

[WA3GIN]

If you double the guys can't you half the tension to present the same amount 
of tension on the tower legs.  The star configuration would prevent twist 
movement in the horizontal plan...I don't see a need to double the guy 
tension on the star connection.  Any experts out there that can provide 
"standard" practices for star guying?

73,
dave
wa3gin
----- Original Message ----- 
From: <K7LXC at aol.com>
To: <towertalk at contesting.com>; <w7xu at iw.net>
Sent: Saturday, December 01, 2007 10:47 AM
Subject: Re: [TowerTalk] Star guying


>
> In a message dated 11/30/2007 9:05:18 A.M. Pacific Standard Time,
> towertalk-request at contesting.com writes:
>
>>  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.
>
>    While I agree with Frank, W3LPL, about the stress  issues on the legs 
> due
> to increased guy tension, 55G is good to at least 300  feet so the 
> additional
> stresses introduced by the 6-way guying at 190' should  be well within the
> design limits. (I'm not an engineer but I've worked on  several towers.)
>
>    Using a star bracket will certainly lock down the  tower and prevent it
> from twisting but I've never heard of a properly  installed Rohn tower 
> failing
> because of too much wind induced torque. They'll  take a fair amount of 
> abuse
> even when overstressed so either way I'd say  you're okay.
>
>    One thing you can do is to have the guy wires  mounted as close to the
> rotator plate as possible. That way the torque is  transmitted directly to 
> the
> guy wires without as much influence on the tower  itself.
>
> Cheers & GL,
> Steve    K7LXC
> TOWER TECH
>
>
>
>
>
>
>
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