Great question. Does that mean it will eventually fail when loaded at 10% ?
73,
Joe kk0sd
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Mike
Sent: Wednesday, January 04, 2012 11:05 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Mastrant Rope ? guy wire ?
I wonder what the diameter/strength "creep" to?
74, Mike NF4L
On 1/4/2012 10:52 AM, Joe Subich, W4TV wrote:
> Grant,
>
> On 1/3/2012 10:05 PM, Grant Saviers wrote:
> > I checked my reference text, "Handbook of Fibre Rope Technology" and
> > Dyneema has excessive creep vs Kevlar.
>
> Thanks for the confirmation.
>
> Looks like these Mastrant ropes might be useful for temporary tower
> installations at 10% preload but would require constant adjustment in
> permanent service. These ropes might also be interesting for use with
> an AB-577 or AB-621 with their temporary nature or for guying 80/160
> meter verticals with their relatively low static loads.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 1/3/2012 10:05 PM, Grant Saviers wrote:
>> I checked my reference text, "Handbook of Fibre Rope Technology" and
>> Dyneema has excessive creep vs Kevlar.
>>
>> Dyneema SK60 creeps 0.63% at 15% of breaking load in 100 days. At 30%
>> load it creeps 9% in 100 days!
>>
>> Kevlar 49 creeps 0.041% and 0.05% respectively. A search for "creep" on
>> the Phillystran web site yielded no hits.
>>
>> The Mastrant web site says they are using Dyneema SK75 which another
>> reference shows 22% creep at 30% load in 20 days
>> http://www.abcm.org.br/symposiumSeries/SSSM_Vol2/Contents/SSSM_05.pdf
>>
>> So the guying application seems wrong for Dyneema fibers. Spectra is an
>> even worse choice. Polyester creep is about 5x worse than Kevlar
>>
>> OTOH, Phillystran is well proven and presumably contains the best Kevlar
>> fiber for making permanent guy wires.
>>
>> Grant KZ1W
>>
>>
>> On 1/3/2012 6:15 PM, Joe Subich, W4TV wrote:
>>> On 1/3/2012 5:18 PM, K1TTT wrote:
>>>> Check the original linked page, that place is only selling the 'P'
>>>> type which is the polyester one(and only on special order at that).
>>> Check again ... list all the products from that company on the R and L
>>> site. You will find both the D and the F2-D ropes which are Dyneema
>>> core (similar in performance/strength to Kevlar). The problem - as
>>> explained to me - is that although Dyneema will not stretch under
>>> dynamic load it will "creep" (slowly elongate) under static loads
>>> like those encountered in guying applications.
>>>
>>> 73,
>>>
>>> ... Joe, W4TV
>>>
>>>
>>> On 1/3/2012 5:18 PM, K1TTT wrote:
>>>> Check the original linked page, that place is only selling the 'P' type
>>>> which is the polyester one(and only on special order at that). The 'D'
>>>> versions are on the manufacturer's page, and while the specs are
>>>> better they
>>>> are still only hd polyethylene rope.
>>>>
>>>> David Robbins K1TTT
>>>> e-mail: mailto:k1ttt@arrl.net
>>>> web: http://wiki.k1ttt.net
>>>> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
>>>>
>>>> -----Original Message-----
>>>> From: Wayne Kline [mailto:w3ea@hotmail.com]
>>>> Sent: Tuesday, January 03, 2012 20:58
>>>> To: K1TTT; towertalk@contesting.com
>>>> Subject: Re: [TowerTalk] Mastrant Rope ? guy wire ?
>>>>
>>>>
>>>> My Frist Thought Dave Till I dug into it http://www.mastrant.com/en
>>>> Wayne
>>>> W3EA> Date: Tue, 3 Jan 2012 11:57:06 -0600
>>>>> From: k1ttt@verizon.net
>>>>> To: towertalk@contesting.com
>>>>> Subject: Re: [TowerTalk] Mastrant Rope ? guy wire ?
>>>>>
>>>>>
>>>>> thats just a polyester rope not a tower guy material unless you need
it
>>>> for a temporary field day type tower.
>>>>>
>>>>> Jan 3, 2012 12:43:42 PM, w3ea@hotmail.com wrote:
>>>>>
>>>>>
>>>>>
>>>>> Hi TT'ers HNY Planning my spring 10 meter tower antenna 5/5 35'-72'
>>>>> rebuild. The 3/16 guy wire broken up with 502 insulators levels 32'
>>>>> 64' It's in good shape but has rust wash near there attachment points
>>>>> ! It's been up 22 years in this acid NE rain a new paint job new feed
>>>>> lines rebuild the rotors .. why not new guy support. I Was thinking of
>>>>> doing Phillystran, at least on the top layer. While researching it I
>>>>> stumbled across a product Sold in the USA by RL Electronics in OH.
>>>>> Mastrant guy rope !
>>>>> http://store.rlham.com/shop/catalog/advanced_search_result.php?keyword
>>>>> s=mastrant+and+mp&x=5&y=5Any TT'ers have any experience with this
>>>>> stuff ? Have experience with all the old style and new type Philly
>>>>> stuff and the Fiber-rod. nonconductive guying material . But this is a
>>>>> new one for me. Thanks 73's Wayne W3EA
>>>>> _______________________________________________
>>>>>
>>>>>
>>>>>
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