[TowerTalk] Re: Guy Angles for my Small Property

[Jason Dugas]

Several people have asked as to the type of tower-- it is Rohn 25G.

KB5URQ
  ----- Original Message ----- 
  From: Jason Dugas 
  To: towertalk at contesting.com 
  Sent: Friday, September 24, 2004 7:59 PM
  Subject: Guy Angles for my Small Property


  Hello to the Group,

  I got as far as actually having manufactured my guy anchors and then realized that I was going to have MAJOR trouble getting all my guy wires to fit on my property.  I have read with interest the discussions concerning varying distances from tower base to guy anchors, and I just didn't want to get into all that with my set up.

  So I got on Excel and developed a set of equations which fully describes the guy lengths and angles based on an initial position of the first guy & assuming that all other guys are spaced 120 degrees from the other.

  What I came up with was still a little outside of the Rohn spec, but I wanted to pose it to the group for comments.  Essentially, for a 50 foot tower (my tower height), Rohn does use the 80% rule with respect to the ratio of distance from the base to height of the tower.

  Basically, mine has been cut down to the 60% range.  Just curious if others use the 60% ratio and if that would be acceptable.  I would be happy to say good bye to my tower in 80mph winds, but I'd like it to stand up in 30 or 40 mph gusts!!

  Also, at what angle & tensions do I have to start worrying about actually collapsing the tower due to excessively low ratios?  What are my tradeoffs, assuming I actually have my 120-degree spacing between anchors?

  Thanks,

  Jason
  KB5URQ