[TowerTalk] 4 Way Guying

[Lonberg, Hank]

Richard:

You are using the 80% guideline as published by Rohn. You can actually use
the same guy points you use now and place the additional guys there also.
What you need to do is to calculate the new loads and see if you guy point
attachment and supporting structure of the roof can handle the additional
load. The 80% is not hard and fast just a published value that is worked out
for users by Rohn.

If you really must go to 4-way guying then consider this: Get some ¼" thick
steel plate and have it cut in a square larger than the outside dimensions
of the tower legs. Burn a hole in each corner and burn holes for the legs
oversized slightly to match. Install at tower joint nearest desired guy
position. The plate will rest on the horizontal bars and the tower legs will
protrude thru the plate to allow the next section to be installed. Install
your guys to the corner holes and you are in business. The plate distributes
the load fairly evenly to all three legs and is a better connection than
looping an addition guy at one of the legs.

Hope this gives food for thought.

Hank / KR7X, P.E.



	-----Original Message-----
	From:	Richard Thorne [SMTP:rthorne@tcac.net]
	Sent:	Wednesday, March 29, 2000 11:22 AM
	To:	Tower Talk (mail list)
	Subject:	[TowerTalk] 4 Way Guying


	Hello Group:

	I think this has been brought up before, but a search of the
archives
	was not much help.

	I have my tower installed on top of my office building.  With 3 way
	guying (spaced 120 degrees apart) I can get a distance of 50'
between
	the tower base and the guy anchor point.

	I'd like to go higher to 90' so I'll have room for a 3 stack of
C3's.
	90' of tower calls for a guy anchor distance of 72'.  I can't get
that
	kind of distance with 3 way guying, but I can with 4 way guying.  (
A 3
	guy system requires a space that is 120' square, with 4 way guying
it
	only requires a space that is 100' square, give or take a foot).
The
	roof top is 100 deep by 200' long, so there just isn't room for a 3
guy
	system.

	Is there any reason I shouldn't do this?  I realize one of the tower
	legs will have two guy wires tied to it, but it seems to me that 4
way
	guying would provide a better structure.

	--
	73,

	Richard Thorne
	ARS N5ZC (ex KA2DSY, N2BHP, WB5M)
	Remote Control Airplanes:  AMA# 657062
	http://www.tcac.net/~rthorne/



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