Yeah, I just checked and Kurt, K7NV's website (http://www.k7nv.com/) is
still alive, but the only thing that comes up is a text banner that says
"STAY TUNED FOR UPDATES". I hope that means someone is in the process
of picking-up where Kurt left off.
As you suggest, Jim, all the old material (including the guy stretch
study is available via the internet archive):
https://web.archive.org/web/20160515164110fw_/http://k7nv.com/index.htm
73, Mike W4EF...........
On 7/31/2023 11:30 AM, Lux, Jim wrote:
On 7/31/23 10:01 AM, Tom Hellem wrote:
Mark-
The Rohn book specifies guying at 3 levels for 100' of R45.
Top guy called out at 1/4" EHS, and other two at 3/16" EHS.
I think you could safely assume that if you used Mastrant product
equal in
working load capacity to the EHS you would be OK. I would definitely
defer
to the
tower erection experts on this group, though.
Don't know about deterioration from sunlight, weather, etc.
And I sure wouldn't use it at the bottom end where it would be
subject to
damage
from critters, humans, fires, etc.
FWIW.
Tom
K0SN
On Mon, Jul 31, 2023 at 6:19 AM Mpridesti via TowerTalk <
towertalk@contesting.com> wrote:
Anyone here have experience using the heavy duty Mastrant rope and
all the
necessary accessories for guying a Rohn tower to 100 ft?
Looking at the M-type rope perhaps 8-10-12 mm size.
Regards,
Mark, K1RX
I would want to do some analysis (or have someone analyze) the effect
of the rope being much stretchier. Failure load isn't the only thing.
If nothing else, stretchier will change the distribution of loads
among the guys, relative to steel. With multiple guys, it's
potentially a complex analysis (because the tower bends too) - N7LV
had some nice analyses, maybe one could pull the model from that and
run it with different guy properties. His website is archived
somewhere, and I believe he used GRAPE as the tool.
Wind induced vibrations might also be an issue (different mass/length
and stiffness). You don't want to be inadvertently building a 100
foot aeolian harp.
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