# [TowerTalk] {SPAM} Re: hazer comments

bill rubin brubin2010 at gmail.com
Thu Jul 31 17:21:20 EDT 2008

```sorry not 10% (#440) !!     example 1/4 at 60F is #670 tension

Guy Guy Cable Initial Tension (lb)  Cable Ambient Temperature  Diameter 0°
F 20° F 40° F 60° F 80° F 100° F 120° F    3/16 590 520 460 400 340 280 220
1/4 980 870 770 670 560 460 360    5/16 1650 1470 1300 1120 950 780 610 73
Bill N1HWC

On Wed, Jul 30, 2008 at 11:17 PM, Roger (K8RI) <K8RI-on-TowerTalk at tm.net>wrote:

> Dan Hearn wrote:
> > Dennis: You will find different opinions here on many subjects however I
> > believe there is almost uniform opinion on guying crankup towers. Don't
> do
> > it. That puts additional stress on the lifting cables when horizontal
> force
> > is applied to the tower.  73. Dan, N5AR
> >
> >
> (If I did the math correctly)
> Think of it this way.  Each 1/4" guy wire at 440# tension  (10% of 4400#
> strength) and 60 degrees  at the anchor = 30 degrees angle at the
> tower.  Neglecting the weight of the guy = 440*Cos(30) = 381#. There are
> three guys per level so that would be 1143# vertical load added to the
> tower and on the raising cables.
> Say a second set at 45 degrees = 440#*Cos(45)= 311# or 933# vertical
> two levels that move adds over a ton of load on the cables. Using steel
> guys would also add additional weight from the cables as would larger,
> stronger guys.
>
> The strength of wire rope varies over a very wide range which makes the
> selection of the cables a primary consideration and pretty much
> eliminates what you find at the corner hardware, or big box store
> although the hardware store could likely order it to spec.  This is also
> why it's important not to oversize the guys on a tower.
>
> 73
>
> Roger (K8RI - ARRL Life Member)
> N833R (World's oldest Debonair)
>
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```