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Re: [TowerTalk] Using Mastrant rope guying Rohn 45

Subject: Re: [TowerTalk] Using Mastrant rope guying Rohn 45
From: Steve Muenich <srmuenich@gmail.com>
Date: Mon, 31 Jul 2023 13:58:43 -0500
List-post: <mailto:towertalk@contesting.com>
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@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@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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