If you use phillystran then there is a lot less weight involved in the guy
assemblies.
Mark N1UK
----- Original Message -----
From: "David Robbins" <k1ttt@verizon.net>
To: <towertalk@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@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@hetzel.org
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