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Re: [TowerTalk] Quickly releasable knot

Subject: Re: [TowerTalk] Quickly releasable knot
Date: Mon, 23 Feb 2004 18:49:46 EST
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Way back there was a discussion about knots and some marine or knot web sites 
were mentioned.

I tried to avoid using tag lines while lifting antennas. I was blessed to 
have Bertha, no guy wires and had to do my antenna work just by myself. In 
to simplify the installation of antennas on the tower, I used short "mast" 
attached to the boom to mast plate. From the top of that mast I would run boom 
guys. This allowed properly tension the boom guys on the ground level and level 
the boom (62 ft). Then the block and tackle was attached to the top of the 
short "mast." There was a small loop (with carabiner) from the block going over 
the pulling line which managed to ride on the pulling line. I could pull away 
from the tower by controlling the angle of the pulling end. This way antenna is 
nice and balanced and no need for tag lines. I would lift it up to the 
mounting level, tie the pulling rope and go up and put the mast clamps. XYL 
untie the rope and I would pull the block down (safety "declaimer" too). 
With guyed towers you might need the tag lines to maneuver the antenna around 
the guys.  


In a message dated 2/23/04 4:39:27 PM Eastern Standard Time, writes:
This past weekend I was on a ground crew putting up two large 40m 
yagis.  Because the tag lines needed to be reachable from the tower, they 
were attached only maybe 18 inches from the center of the boom, which made 
it very hard to apply enough force on the tag lines to control the antenna 
(lever arm too short).

I seem to recall reading, at one time, about a special type of knot 
designed for remote untying.  In a nutshell, it holds tight as long as the 
"untying" force is applied through the loop formed by the knot, but a good 
tug on a "pigtail" sticking out of the knot itself will cause the knot to 
untie.  It occurred to me that such a knot could have been used to attach 
the tag lines some distance from the center of the boom, with the pigtail 
taped to the boom and long enough to reach to the center, so that the tag 
lines could be released when no longer needed.

Am I making this up, or does someone know the details or, perhaps, a web 
site source?

See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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