I was wondering if anyone was going to ask that :-)
In the past what I have been doing is making a temporary loop (you know
the kind that if you pull on the ends with nothing inside the loop, the
loop will disappear).....well anyway once the double Bowline knot is
hoisted up to the top of the tower and wire antenna attached I create a
temporary loop at the bottom and slip it over a smooth curved 3/8" steel
hook I have fastened to one of the tower legs. It's not super easy to
make because the line is fairly tight but not so tight that I cannot
make one. When it's time to lower the antenna I simply pull the loop off
that steel hook, pull the knot apart and lower the antenna like a flag.
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/27/2019 10:23 PM, Howard wrote:
Hi,
I'm sorry I don't have any additional knot information than what has
already been provided, however, I have a question. After you pull the
loop for your dipole to the top pulley, how do you intend to hold the
rope in that position?
Howard, WA9YBW
On 11/27/2019 3:50 PM, Gedas wrote:
Hi Wes and TU. I am not sure I am positive what you mean by only a
load on the upper side of the knot.
I am going to have two pulleys, one at the top of the tower and one
at the bottom. I am going to have a single long rope threaded around
both pulleys and I am going to use a fisherman's knot or similar to
tie the two together nice and tight. Not going to be much tension in
the rope at this point, maybe 10 pounds just to keep both sides of
the line nice and tight with no slop.
Now, I was hoping for a single knot that not only joined the two ends
of the rope together but that also left me with an open loop so I
could easily slip in something like a temporary chain link etc and
then attach one end of a dipole etc to that link.
This way from the ground I would be able to hoist up or down that end
of the dipole as I pleased. Now, when the end of the dipole gets
attached to the other end of that temporary chain link etc and the
dipole is up in the air stretched tight there may be 30-40 pounds of
tension pulling on that line. Since the two pulleys are fixed that
tension from the dipole will get translated to my ropes going up and
down the tower between the pulleys.
I have been doing this type of arrangement for 20 years but only with
a pulley at the top of the tower. Up until now I just had the long
single rope looped around a round aluminum cross member of my free
standing tower.
There was some friction with the rope looping around the 3/8" dia
round & smooth diagonal but I never had a failure. This season I
installed a meaty pipe across the tower at about the 5' level and
attached a pulley at each end (I am going to have several ropes going
up and down so I can support and mess with more then 1 antenna).
I hope that paints a more clear picture. So far I have had a lot of
great ideas and the only issue is me understanding their words and
making my fingers tie the knots the way I'm supposed to hi-hi.
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 11/27/2019 4:25 PM, Wes wrote:
I'm with the other Wes on this one. If I understand correctly you
only have a load on the upper side of the knot. I would join the
ends with any old knot and tie a alpine butterfly loop on the upper
side of the knot:
https://www.animatedknots.com/alpine-butterfly-loop-knot or one I
find easier to tie, a bowline on a bight:
https://www.animatedknots.com/bowline-on-a-bight-knot
Wes N7WS
On 11/27/2019 2:06 PM, Wes Attaway (N5WA) wrote:
Gedas:
You have received a lot of good suggestions. Here is one more, and
it is
pretty simple. You are apparently not going to be risking anyone's
life.
You are going to hold up one end of a dipole and there may be
30-40-pounds
of tension..
I would just join the two ends of the Dacron rope with a simple
square knot
and with 6-inches or so of each rope sticking out from the knot.
Then tie
the two ends into a square knot. Tape the ends to the rope if you
want to.
With constant tension this arrangement will never come loose. I
have done
this many times over many years with ropes into trees and on
towers, etc.
Constant tension on the rope will keep the knots nice and tight.
-------------------
Wes Attaway (N5WA)
(318) 393-3289 - Shreveport, LA
Computer/Cellphone Forensics
AttawayForensics.com
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|