Do you consider 15% to be a SIGNIFICANT increase in strength?
I don't.
Worst case for a 3 way guy arrangement is at 30 degrees
to any one of the guys. Force in the guy is equal to the
in line force divided by COS 30 degrees (= 0.866) = 1.155
or 15.5% more tenstion that an inline force which is the worst
case for 4 way guying.
The old 80% guying guideline applied to the FULL rated height
of the towers (200 ft for R25). At 70 ft or less, the tower can take
more of the load from close in guys since it does NOT have to
support the weight, guy tension, and resolved wind load
of a tower extended to the full rated height.
Tom N4KG
On Mon, 2 Sep 2002 08:53:46 -0400 "Roger Borowski" <K9RB@bellsouth.net>
writes:
>
> ----- Original Message -----
> From: <n4kg@juno.com>
> To: <TOWERTALK@contesting.com>
> Sent: Monday, September 02, 2002 3:01 AM
> Subject: Re: [Towertalk] Tower Buidling 201
>
>
> >
> > Note that for tower heights under 70 ft, Rohn shows a 35 ft (50%)
> > guying radius for their (discontinued) fold over tower
> intallations.
> >
> > Tom N4KG
> >
> That is because the fold over series must be guyed with FOUR guys,
> 90 degrees
> apart, which is a significantly stronger method of guying vs. three
> guys at 120
> degrees apart. There was a tread about this about 4-5 years ago.
> 73, -=Rog-K9RB=-
>
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