[TowerTalk] Tower guy line Anchor Positions

[R. David Eagle]

 Great Points! Thanks Grant and Scott  I figured that since I was stretching out the horizontal component I would have to very the tensions in some fashion.  I can't foresee a huge load on the tower....just an A3S Tribander.  BUT nonetheless, I want to make sure it will be safe most of all.
Thanks again!
Dave,KB8NNU

    On Saturday, January 23, 2021, 12:54:27 PM EST, Grant Saviers <grants2 at pacbell.net> wrote:  
 
 I agree with Scott. Not an expert, but likely took the same statics 
course.

The total tension in each guy varies according to its angle with the 
tower in order to make the horizontal tensions the same.  If they 
(horizontal) are then a tower should be plumb or something else is 
happening.

A limiting factor in decreasing the angle is to not exceed the total 
vertical load rating = dead loads plus vertical tension component of all 
guys plus wind load converted to vertical by the guys (approximately 
speaking since the real stress calcs are more involved).

Another choice to avoid a driveway or to mow under is a elevated post 
tie off for the guy that achieves the same angle with the tower for all 
guys.  It does need to be buried plus dead weight or back guyed to 
resist the overturning moment.  Plus strong enough.  More than statics 
101 needed.

Grant KZ1W


On 1/23/2021 09:14, K9MA wrote:
> Keep in mind that, unless the tower is very stiff, the horizontal 
> component of the tension in all the guy wires will be equal. That means 
> that if the anchor points are not equidistant from the tower, the total 
> tension in the guy wires will not be equal. The greatest tension with be 
> in the guy wire anchored closest to the tower. That suggests that the 
> tension in that guy wire should be the usual 10 percent or so of 
> breaking strength, and let the others fall where they may, as long as 
> the tower is plumb.
> 
> This is all from Statics 101 many years ago and simple trigonometry. The 
> real tower experts on this list may disagree, and I'd defer to them.
> 
> 73,
> Scott K9MA
> 
> On 1/23/2021 8:34 AM, R. David Eagle via TowerTalk wrote:
>> Hello,
>> I am considering putting up my Glen Martin Tower with Hazer that I 
>> purchased from an estate a couple years ago and after careful 
>> measurements and drawing everything out, I have noticed that I may 
>> have to extend an anchor point out a little to clear a parking area.  
>> Now, this is only a 40' tower....So how critical is it that ALL 
>> anchors be distanced from the base equally?  OR just maintain 
>> tensions?  Good ol physics.
>> Any help would be appreciated...
>> Thanks,
>> DaveKB8NNU
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