[TowerTalk] Maximum Guy Radius

[Mark Robinson]

If you use phillystran then there is a lot less weight involved in the guy 
assemblies.


Mark N1UK


----- Original Message ----- 
From: "David Robbins" <k1ttt at verizon.net>
To: <towertalk at contesting.com>
Sent: Wednesday, 21 September, 2011 10:03 AM
Subject: Re: [TowerTalk] Maximum Guy Radius


>
> the answer is a definate maybe... with a caveat to 'do what the 
> manufacturer says'.
>
> The problem is that as you move the guy point farther out you increase the 
> length of the guys which also increases their weight, and the amount of 
> sag for a given tension, which may actually increase the movement of the 
> tower.  the manufacturer has probably done that tradeoff study already and 
> decided that 80% was a good compromise between forces, length, weight, 
> wind, cost, etc, etc, etc.
>
>
> Sep 21, 2011 09:33:55 AM, kb4eq at hetzel.org wrote:
>
> If I have a tower of a specific fixed height that I will be erecting,
> and I have plenty of room to do so, I would estimate that I should
> gain *some* additional strength against wind-load by moving the
> guy radius from 80% of height to 100% of height, since this will
> move the guy angle closer to horizontal and reduce the down
> force on the tower and increase the horizontal back-force for
> a given guy tension and a given stretch in a guy due to motion
> of the tower.
>
> Can anyone comment from either a practical experience or
> engineering point of view whether this estimate is sound?
>
> 73,
>
> Dorn Hetzel
> KB4EQ
> kb4eq at hetzel.org
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