Steve,
The thing that makes a self supporting tower self supporting is the big
block of rebar reinforced concrete under it. Adding guys to a self
supporting tower may actually make it fail because of loads introduced
by the guys that were never intended by the manufacturer.
When the wind blows across guys, that force is transferred as a downward
force through the tower to the base. Rohn 25/45/55 were designed to be
guyed. I'm quite sure the Heights aluminum tower was not.
As the list moderator is so fond of saying "do what the manufacturer
says to do".
On 8/15/2010 5:35 PM, Steve Sala wrote:
> What is it that makes a standalone tower stand alone? without guys? I have
> a used Heights tapered aluminum tower which I am going to install sort of
> close to the shack to put my Vhf/Uhf yagis on to minimize feedline length.
> Is it because the taper makes the shape sort of triangular which, I bet, is
> the most stable of geometric shapes (compared to a Rohn 25-45, etc. which
> all sections are non-tapered)?
>
> Would I affect anything by adding a set of guys so I don't panic as much
> when I climb it to install the sections and then the rotator and yagis?
> Even though the hole in the ground holding the three long bolts would be
> about 7 feet deep by 4 feet wide, minimizing movement is an objective while
> I am up there. I was thinking of three Phillystran guys that I connect to
> ground anchors when I am on the tower and then either removing them from the
> ground anchors for operation or keeping them on for extra stability.
>
> This Heights tower is going to be 60 feet tall although it originally was
> 112 tall. A friend topped it off later at 60 feet with a new flat plate so
> he it would not interfere with his astrophotography in his yard.
>
> 73
> Steve
> K7AWB
> Nine Mile Falls, WA
> DN17es
>
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--
R. Kevin Stover
ACØH
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