[TowerTalk] Using Mastrant rope guying Rohn 45

[Michael Tope]

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 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.
>