Towertalk
[Top] [All Lists]

## [TowerTalk] Fwd: Fwd: Maximum Guy Radius

 To: towertalk@contesting.com [TowerTalk] Fwd: Fwd: Maximum Guy Radius HansLG@aol.com Thu, 6 Oct 2011 20:54:58 -0400 (EDT) mailto:towertalk@contesting.com>
 ``` Hi Bill, With"stiffness" I mean how much the tower will move for a specific wind pressure. In my calculations I assumed that the tower moved 1" for a give wind. Then I calculated how much the tower moved for the same wind force with different guy anchor point. I found that minimum move was for an anchor distance of ~142%. (probably sqr(2)) under the assumption of no guy wire sag (which is impossible). I was just "playing around" with a spread sheet and was interested to see where the optimum point was. 0% anchor point is no good for obvious reason but an anchor point very far away is not good either as the guy wire is springy and a too long wire will allow the tower to sway in the wind. That's when I saw how much less critical the angle is between the wires when you are using four guy wires instead of three. Hans - N2JFS In a message dated 10/6/2011 3:57:02 P.M. Eastern Daylight Time, baycock2@centurytel.net writes: When anyone uses the words "stiffness" and "optimum", I want to ask "Stiffness of what?" and "With respect to what criteria?" Also- what type of tower? Why Utility and not EHS? Bill--W4BSG On 10/1/2011 10:17 PM, _HansLG@aol.com_ (mailto:HansLG@aol.com) wrote: Hi Dorn, I made some calculations regarding guy wires some time ago. One thing I found out was that you gain some stiffness by mowing the guy anchor out some. Not considering the sag, the optimum anchor point is about 140%. If you include sag you probably have to decrease that a little. I also noted that it is a lot easier to use four guy wires instead of three. The position of the angle is much less critical. I use 5/16" (11,400#) utility grade wire for my guys which was a lot easier to work with than expected. You can check it out at __http://www.facebook.com/media/set/?set=a.10150198503693539.328964.57975353 8&l=1c649b80ab&type=1__ (http://www.facebook.com/media/set/?set=a.10150198503693539.328964.579753538&l=1c649b80ab&type=1_) (_http://www.facebook.com/media/set/?set=a.10150198503693539.328964.57975353 8&_ (http://www.facebook.com/media/set/?set=a.10150198503693539.328964.579753538&;) l=1c649b80ab&type=1) 73 de, Hans - N2JFS ``````_______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```