[TowerTalk] Using Mastrant rope guying Rohn 45

[S57AD]

Rhe prive.

V V pon., 31. jul. 2023 ob 20:59 je oseba Steve Muenich <srmuenich at gmail.com>
napisala:

> Why not just stick with the tried and proven Phillystran?
>
> Steve
> NA5C
>
>
> Sent from my mobile device
>
> > On Jul 31, 2023, at 1:31 PM, Lux, Jim <jim at luxfamily.com> 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 at 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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> >
> >
> >
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-- 
Mirko S57AD