[TowerTalk] Shortened Guy Leads On R25G

[john at kk9a.com]

I don't think anyone except a PE can tell you if this is safe.  My 70' tower
in Aruba has more wind load than yours and a smaller guy radius, however I
used Rohn 55g and also 5' high guy posts.  Since there will be added stress
using the smaller guy radius you will be safer using a stronger tower and
larger guy wires than standard.  It is certainly possible to engineer a
system that will work for you.

John KK9A / P40A



To: towertalk at contesting.com
Subject: [TowerTalk] Shortened Guy Leads On R25G
From: "jknodel M Knodel" <jknodel at msn.com>
Date: Mon, 23 Oct 2006 12:55:07 -0700
List-post: <mailto:towertalk at contesting.com>

Thanks for the help with my previous questions regarding the crankups.  Here
is my next question.  I would appreciate any thoughts I could get on it.

I am planning on putting up a 60' (actually about 61.5' with the BPL25G top
thrust bearing plate) Rohn 25 tower.  I will have one 3 element SteppIR beam
with the 30/40m dipole option on it.  This antenna is 8.1 sq. ft wind load
and will be placed just a couple inches above the thrust bearing (no long
mast on top).  The 60' tower is rated at 10.2 sq. ft. windload for 90 mph
(my area windspeed).

I would like to place the downguys at a shorter distance than the 80%
spec'ed by Rohn.  I surveyed my property and calculated (with AutoCAD) that
I can get guy leads of 41.28' (69% of 60', 67% of 61.5').  Do you think guy
leads at 67%-69% instead of 80% would be safe?  Thanks for any help on this.
  I appreciate it.

Jon N7XW