5/16ths is definitely easier to pull and much more comfortable on the
hands when pulling hard.
Mature trees should not grow around rope, but girdling a tree (running a
small rope all the way around) can kill a tree of any age.
I usually put even 5/16ths inside a half inch air hose. I normally use
the yellow hose with a very smooth outside surface. I've had no
problems even with growing trees large enough to serve as a relatively
stable anchor point. This is not a dynamic anchor like a pullet but can
be a good anchor for a pulley using an "S" hook or carabiner.(sp?)
73
Roger (K8RI)
On 8/12/2016 Friday 2:37 AM, Jim Brown wrote:
On Thu,8/11/2016 10:02 PM, Roger (K8RI) on TT wrote:
5/16ths is over 1700# strength, but a bit more expensive.
FWIW, I use the 5/16-in rope because it's easier to grab hold of to
pull tension on my very high dipoles. 3/16-in (and even 1/8-in) is
plenty strong enough for most antennas that aren't very high.
Wes, N7WS, described a system similar to one I rigged here soon after
I moved here, with help from Ira, K2RD, and others. I replaced it with
the system of pulleys that I now use because it allowed me to get the
antennas higher, and it also allowed me to rig a 20/15/10 fan in line
with the 80/40 fan that had loading coils for 160.
The system that Ira showed me how to rig had a continuous loop of
5/16-in that he launched over a limb with his pneumatic tennis ball
launcher (he cleared the tallest redwood on my property -- about 175
ft -- by at least 10 ft on the first shot). To that loop he attached a
pulley, then pulled the support wire through the pulley, then pulled
the pulley it all the way to the top.
That system survived at least one winter without a weight, because
there was enough "give" in the way the pulley was rigged to allow for
sway, but I'm not confident that the loop rope would have survived
over that limb for 10 years. :) Wes's experience suggests otherwise.
73, Jim K9YC
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73
Roger (K8RI)
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