HI TT'ers. Obviously there are other out there as skeptical as I am. I was
hoping to stir some insight from over the pond. As that's where there market
base seems to be. Manufactured in ChezRepublic. The the knowledge base
exploring inform sources like " Handbook of Fiber Rope Technology" ect. is
why I ask these types of Questions.Some time it's hard to teach an old Dog new
Trix. I remember my first Philylstran install. with the potting compound and
the 1000's of fuzzy Kevlar Hairs. Or my own 65G with Pollyrod when I
could snap a 4ft length in Half with not much effort like a wooden dowel.But
it proved me wrong.... HNY all Wayne W3EA PS. My antennas beam width
are wide enough. I don't need to climb my tower with my I Phone and it's new
app. to find North. now is that true N or Magnetic N ? hummmmmmm
> Date: Wed, 4 Jan 2012 14:00:46 -0800
> From: grants2@pacbell.net
> To: nf4l@att.net
> CC: towertalk@contesting.com
> Subject: Re: [TowerTalk] Mastrant Rope ? guy wire ?
>
> Several possible answers -
>
> Some fibers creep at low (15% breaking) loads until they break. Not so
> good for guys!
> Some creep and stabilize to a fixed strain w/o much change in breaking
> strength. Phillystran says set the initial guy load at 15% B.S. and it
> will relax to 12% which is the recommended level.
> The breaking strength change for most fibers is dependent on stress
> cycling history and is complicated.
> Other factors also modify breaking strength - moisture absorption, fiber
> lubrication, contamination... and fibers are different in how they
> respond to these issues.
>
> Fiber ropes are so complex and varied, that I'm convinced that for
> permanent guys there are only (IMHO) three proven solutions - EHS,
> Phillystran, and solid rod and are used on large commercial towers. It
> would be interesting to know if there are 300, 600 or 1000 footers out
> there with other guy materials.
>
> Grant KZ1W
>
>
> On 1/4/2012 9:05 AM, Mike wrote:
> > 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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