I must be a heretic on tower building. If I were an engineer, I'd probably
still be designing my first tower. I can see stress tensioning the guys on
a 600' commercial tower, anyone can, but on 50' or 60' of Rohn 25 I really
do not see the need to get wrapped around an axle over it. In the older
catalogs, 40' was self supporting. It wasn't until the lawyers got involved
that it had to be guyed at 20 through 40 feet.
I have 8 towers up at this time from 20 to 80 feet. I guy my towers when
they are at 50' and above. To be honest, I have lost 2 towers. When Hurricane
Ike went directly over my place a tree snapped and fell across the guy
wires to those 2 towers and brought them down. They might still be standing
without the guys...never know. Also I only put one beam on a tower, mainly
to keep a clean pattern. If one's intent is to stack 4 el 40m beams, guy
away by all means.
My thoughts, as wrong as they may be, are that the guys on a 60' tower only
need to be tight enough to keep the tower vertical. I've never pulled a
guy wire more than hand tight on a turnbuckle. What would be the need to
apply much more vertical and horizontal stress on a tower? If the tower
flexes
one inch in a strong wind the guy wire on the windward side will tighten
and apply the necessary force to stop the tower movement. The middle guy
wires only need to be snug enough to keep the center sections of the tower
from doing the hula.
Just my observations on tower guying after 3 hurricanes.
Marty Haley AB5GU
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