My biggest concern furling a loaded genoa would be the twisting force on the aluminum foil extrusions and especially the joints between them. I try to get the genoa behind (to leeward of) the main before furling. Seems to work quite well (no winch required).
Gary S/V Kaylarah '90 C&C 37+ East Greenwich, RI, USA ~~~~~~~_/)~~~~~~ On Mon, May 29, 2017 at 8:48 PM, Chuck Gilchrest via CnC-List < cnc-list@cnc-list.com> wrote: > Seems about right. And I too will unload the sail before furling or > reefing so there isn't the full force of the sail working against the > furler. > Calculations of the load of the sail transferred to the furling line would > be difficult given sail size, wind speed, wind angle, friction in bearings > in the furler, sail condition, and sheeting would all play into the > equation. More of a sailmaker question I would think... > Or if one had a load cell that could be hooked up to the furling line for > field testing. > Chuck > > Sent from my iPhone > > On May 29, 2017, at 3:15 PM, Marek Dziedzic via CnC-List < > cnc-list@cnc-list.com> wrote: > > Chuck, > > I cannot pull the furling line when it is loaded. I know that people try > doing that with a winch, but from what I know it is not what furler > manufacturers recommend. I furl only when the genoa is slacked (usually a > bit down wind, during a tack, or when sheets slacked if little wind). > > In order to split this hair... Assuming that the radius of the sail > wrapped around extrusion is the same as the radius on the drum, the force > would be equal to what the sheet is pulling. I think that one might assume > that the leverage is 2:1 (the drum radius is double of the sail radius), so > the force is half. I am not sure how safe is that assumption. > > Marek > > *From:* Chuck Gilchrest via CnC-List > *Sent:* Monday, May 29, 2017 12:35 > *To:* cnc-list@cnc-list.com > *Cc:* Chuck Gilchrest > *Subject:* Re: Stus-List furling line > > > Marek, > > The tensile strength of 5/16” XLE polyester double braid is roughly 3600 > lbs. Even if one were to assume a 5:1 ratio to develop a “safe working > Load” you’d still be looking at 720lbs. I can’t imagine that there would > be that much pressure against the drum..you certainly wouldn’t be able to > pull the line if it were loaded that heavily. > > Chuck Gilchrest > > S/V Half Magic > > 1983 LF 35 > > Padanaram, MA > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com > <cnc-list-boun...@cnc-list.com>] *On Behalf Of *Marek Dziedzic via > CnC-List > *Sent:* Monday, May 29, 2017 12:22 PM > *To:* cnc-list@cnc-list.com > *Cc:* Marek Dziedzic <dziedzi...@hotmail.com> > *Subject:* Re: Stus-List furling line > > > > Anyone calculated what should be the working load strength for the furling > line? It does not count, if you don’t ever use it for reefing, but what if > you do? > > > > One could probably run some calculations (e.g. based on the working load > on the sheet and the ratio of the diameter of the furling drum and the > sailed furled on the extrusion), but if there is a ready-made solution, I > would be interested. > > > > thanks > > > > Marek > > 1994 C270, Legato > > Ottawa, ON > > > > > > *From:* Chuck Gilchrest via CnC-List > > *Sent:* Monday, May 29, 2017 12:14 > > *To:* cnc-list@cnc-list.com > > *Cc:* Chuck Gilchrest > > *Subject:* Re: Stus-List furling line > > > > +1 on Cajun Rope. Very reasonable pricing. Also check with R&W Rope in > Massachusetts www.rwrope.com and search under Novabraid XLE as that is > the same rope sold by Cajun (made by Novabraid from Nova Scotia). R&W does > free US shipping for orders over $30. Jamestown Distributors is also > currently having a sale on the same line > > https://www.jamestowndistributors.com/userportal/show_ > product.do?pid=54238&familyName=Novabraid+XLE+Polyester+Double+Braid+per+ > Foot > > > > > > The line used on my boat with a Furlex furler is 5/16” (8mm). 3/8” would > be too large diameter and take up too much room on the drum and I only have > a 135% jib on my boat. > > Chuck Gilchrest > > S/V Half Magic > > 1983 35 Landfall > > Padanaram, MA > > > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of > *Frederick > G Street via CnC-List > *Sent:* Monday, May 29, 2017 11:54 AM > *To:* cnc-list@cnc-list.com > *Cc:* Frederick G Street <f...@postaudio.net> > *Subject:* Re: Stus-List furling line > > > > http://www.cajunrope.com > > > > — Fred > > > Fred Street -- Minneapolis > S/V *Oceanis* (1979 C&C Landfall 38) -- Bayfield, WI > > > > On May 29, 2017, at 10:49 AM, Neil Gallagher via CnC-List < > cnc-list@cnc-list.com> wrote: > > > > Are you thinking of Cajun Rope? > > Neil Gallagher > Weatherly 35-1 > Glen Cove, NY > > On 5/29/2017 11:28 AM, ahycrace--- via CnC-List wrote: > > Looks line I have to replace the furling line on Liberty"s furling drum. > What was the name of that mail order company that sells > reasonable priced quality line I just cant remember it. ( Old timers > syndrome. ) > > > Gary > > "Liberty" > > 38' MK II > > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > >
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