Marek, You are correct about the length! I was thinking of the overall length, not the hoisted length. Its Monday. My 35/3 has about a 45 foot mast, so with the run to the clutch we are talking about 55 feet. My VPC probably stretches no more than 4 inches as I load it. Dyneema does not actually stretch - the braids bury and compact when loaded, lengthening the line. Once it is loaded, it isn't going anywhere. I was told to make my Dyneema lifelines 6 inches shorter than the wire, and it is a good thing I listened.
1/4 in Amsteel is rated at 8600 pounds and is $1.40 a foot at Defender. Add 6 feet of cover and you are good to go. Joel On Mon, Dec 2, 2013 at 12:43 PM, Marek Dziedzic <dziedzi...@hotmail.com>wrote: > Joel, > > not exactly. I don’t know what kind of masts you guys have, but probably > not in the 100 ft range. > > The halyard stretches only on the length of the mast plus the line from > the mast to the clutch (if you run it to the cockpit). Most of the boats we > talk about here have masts in the 40-45 ft range (P dimension). Add 10 ft > for mast to clutch distance. So we are talking 50-60 ft max. > > Additionally, the problem is not with the stretch itself. Once you hoist > the sail and tighten the halyard, you induced most of that stretch already > (it is a good 1+ ft!). The issue is with how that stretch varies with time > and load (creep). In most applications, that creep is substantially less > (single inches vs. 1-2 ft). One of the funniest parts is that Dyneema has > substantial creep under a static load (more than many other less exotic > lines). > > Marek (in Ottawa) > > ______________________________________________________________________ > > Message: 1 > Date: Mon, 2 Dec 2013 11:32:05 -0500 > From: Joel Aronson <joel.aron...@gmail.com> > To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> > Subject: Re: Stus-List halyards again > Message-ID: > <CAEL16P9Qpho8Pte4PZH90t_Y8i-L9bTC+v-U7KN5=nttzc0...@mail.gmail.com> > Content-Type: text/plain; charset="windows-1252" > > > David, > > The rope is stretching over the entire 100 foot -plus length. > Halyard tension should be adjusted during a race - less downwind, more > upwind. > You would need to check the sheaves to see if they were changed. Rope > compatible sheaves are more V shaped. > Rope is more of a DIY project unless you have the tools. You still the > need the rope tail. > Dyneema is lighter than wire, but I doubt you would notice the difference > on a 12,000 boat. > > Joel > 35/3 > Annapolis > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > -- Joel 301 541 8551
_______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
