Fred,
I have to disagree with your statement below. Force doesn't change as the
guy anchor is moved closer to the tower. The direction of the force
changes. At a guy angle of 45 degrees the force is 50/50 in the horizontal
and vertical planes. As the angle becomes smaller (closer to the tower) the
vertical force increases, while the horizontal force decreases. There's no
magic at work here! If you could attach a scale at the guy anchor, you'd
get the same readings at 1 foot from the tower as you would 100 feet from
the tower. When most of the force is in the vertical plane, the earth
holding the "dead man" may give up the ghost quicker than when a horizontal
component is in the mix.
7 3,
Tom K3GM
>
>Tom-
>
>Like the ad says, "Wider is better". The figures quoted might better be
>defined as the "minimum recommended. My guess is that most people would
>like to have the anchors closer to the tower, if that were acceptable,
>since they could have a bigger tower with more antennas on a smaller
>footprint.
>
>Think of the tower as a lever arm pulling on the anchor. The closer the
>anchor is to the base, the less force on the tower it would take to pull
>the anchor free.
>
>73-
>Fred Roberts, W6TKV
>Riverside, CA
>
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|