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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