You really need to do all the math, not just look at the elongation spec. 9mm Crystalyne (3/8 diameter is about the smallest practical for a winch or your hand) has an average break strength of 11500 pounds. So you need 3300 pounds of tension to get 7" of stretch.
The average man can generate 50 pounds force on a winch handle, so you need a size 65 winch. And I'd bet that 3300 pounds exceeds the strength of the luff rope and fabric used to make your sail anyway. And, btw, according to the calculator on the Loos website, the stretch of 1/8" annealed stainless 302/304/316 wire rip is 34% when subjected to a 3300 pound load. So you need to do all the math when evaluation wire to rope halyards as well. Rick brass Sent from my iPad > On Sep 28, 2014, at 17:18, David Knecht via CnC-List <cnc-list@cnc-list.com> > wrote: > > Crystalyne has a 1% elongation at 30% of breaking strength. With 60’ of > line, that is 7 inches (not that we are normally anywhere near breaking > strength). Seems like a lot to me. The higher tech lines are around > 0.5-0.6%. Wire is presumable around 0. Dave > >> On Sep 27, 2014, at 8:05 AM, Josh Muckley via CnC-List >> <cnc-list@cnc-list.com> wrote: >> >> I replaced all mine with Yale Crystaline. Love the stuff. When rope wears >> it frays. I can live with that. When wire wears it makes fish hooks. >> Ouch! Wire also chews up the shives. I can also end for end rope or simply >> freshen up the ends if needed. >> >> Josh Muckley >> S/V Sea Hawk >> 1989 C&C 37+ >> Solomons, MD >> >>> On Sep 27, 2014 7:52 AM, "Joel Aronson via CnC-List" >>> <cnc-list@cnc-list.com> wrote: >>> David >>> >>> I'd consider Dyneema 75 with chafe covers at both ends. Very low stretch >>> and weight. Cheaper than. warp speed ( no offense Edd). >>> >>>> On Saturday, September 27, 2014, David Knecht via CnC-List >>>> <cnc-list@cnc-list.com> wrote: >>>> I need to replace the genoa halyard on my boat and am wondering about the >>>> disadvantage of wire-rope over high tech line. The original spec line is >>>> wire-rope. From what I have priced, wire-rope from APS is cheaper than a >>>> dyneema type very low stretch line (Warp Speed/Endura) and about the same >>>> as somewhat low stretch line (VPC). I see the advantages of wire-rope as >>>> price and essentially no stretch. The only disadvantage I see is a bit >>>> more weight aloft, but as a percentage of the total weight aloft it seems >>>> insignificant. Am I missing something? Dave >>>> >>>> Aries >>>> 1990 C&C 34+ >>>> New London, CT >>>> >>>> <pastedGraphic.tiff> >>>> >>> >>> >>> -- >>> Joel >>> 301 541 8551 >>> >>> _______________________________________________ >>> This List is provided by the C&C Photo Album >>> >>> Email address: >>> CnC-List@cnc-list.com >>> To change your list preferences, including unsubscribing -- go bottom of >>> page at: >>> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >>> >>> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> >> Email address: >> CnC-List@cnc-list.com >> To change your list preferences, including unsubscribing -- go bottom of >> page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >> > > Aries > 1990 C&C 34+ > New London, CT > > <pastedGraphic.tiff> > > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of page > at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >
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