Thanks for the detailed explanation Dennis! I have setup #3, just like Ron and I consider my mast to be a tree trunk as well. I haven't noticed any movement in the mast but maybe I just don't have enough experience to see it. I haven't spent much time sailing on many other boats, only a few and only briefly. My frame of reference is very limited.
Steve C&C 32 Toronto On Thu, Oct 18, 2012 at 12:18 PM, Ronald B. Frerker <rbfrer...@yahoo.com>wrote: > The mast extrusion is an important part. > The C&C 30-1 has config. 3 but has a tree trunk for a mast. No pumping, > but then one can't achieve any mast bend either. Backstay only tightens > forestay; doesn't induce any bend. > Ron > Wild Cheri > C&C 30-1 > STL > > > --- On *Thu, 10/18/12, Dennis C. <capt...@yahoo.com>* wrote: > > > From: Dennis C. <capt...@yahoo.com> > > Subject: Re: Stus-List Dyneema baby stay > To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> > Date: Thursday, October 18, 2012, 10:55 AM > > > Steve, > > Mast pumping is when the middle of the mast moves fore and aft as the boat > hits waves or is subjected to sudden puffs. Pumping is minimized by > babystays or running backs. Running backs are lines or wires attached at > stress points on the mast which then run aft to a purchase or winch to > allow tensioning or relaxing. > > First, a primer on some generic rig types. > > 1. Mast with split lower shrouds. Upper shroud attaches to point on deck > dead abeam of mast then carries upward to spreader(s) then to top of mast. > Fore and aft lower shrouds attach to points on deck forward and aft of > upper shroud attachment. > > 2. Mast with inline shrouds and swept back spreader(s). All shrouds are > attached to same point at deck somewhat aft of mast. Spreaders are angled > aft from mast. > > 3. Mast with inline shrouds and straight spreaders. All shrouds are > attached to same point at deck dead abeam of mast. Spreaders are straight, > not angled. > > OK. In configuration 1, the middle of the mast is stabilized by the lower > shrouds. This configuration rarely pumps unless the lower shrouds are > loose. > > In configuration 2, the mast is bent by tightening the shrouds. The > tension on the shrouds pushes forward on the spreaders resulting in the > middle of the mast being pushed foreward. These rigs are somewhat subject > to pumping. You may or may not see babystays or running backs. > > Configuration 3 is most subject to pumping. With inline shrouds and > straight spreaders, there is nothing to stabilize the middle of the mast > fore and aft. If the mast extrusion is bendy, it will bend back and forth, > hence pumping. > > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > ------------------------------ > *From:* Stevan Plavsa <stevanpla...@gmail.com> > *To:* cnc-list@cnc-list.com > *Sent:* Thursday, October 18, 2012 10:19 AM > *Subject:* Re: Stus-List Dyneema baby stay > > What exactly is mast pumping? > The early 32's seemed to not come with baby stays but I believe the later > ones did. I've also read that the 32 is "prone to mast pumping" but I don't > know what that means :) > I have an idea, but I don't really know. Mine is an early one with no baby > stay. However, there is a funny little attachment point (female, threaded, > ~1/2") on the floor inside the vee birth that I have no idea what it's for, > maybe related, maybe not. > > Thanks, > Steve > C&C 32 > Toronto > > > On Thu, Oct 18, 2012 at 10:34 AM, Morgenstern, Keith E CIV SEA 08 NR < > keith.morgenst...@navy.mil<http://mc/compose?to=keith.morgenst...@navy.mil> > > wrote: > > This may come across as pedantic....but have you ever tried to cut > dyneema? > > That stuff is *hard* on knives.....I have a Spanish steel bladed (like > they use for swords), and I can only make 1 splice before it's time to > reshapen. > > I've switched to utility knives, and go thru at least 1 blade (usually > both tips) every splice. > > So..yeah, it's "fabric" in the sense that it's not metal, but It's > insanely resilient and tough. > > For babystay, I'd switch in a heart beat, if I hadn't replaced it with > wire only a few years ago before I was hooked on spectra. > > And that's the new name for my next rock band: "Hooked on spectra" > > -Keith > > -----Original Message----- > From: Pat Nevitt > [mailto:pnev...@gmail.com<http://mc/compose?to=pnev...@gmail.com> > ] > Sent: Thursday, October 18, 2012 9:11 > To: Law Office of Craig Meyerson; > cnc-list@cnc-list.com<http://mc/compose?to=cnc-list@cnc-list.com> > Subject: Re: Stus-List Dyneema baby stay > > I have a 29-2 that has a baby stay on it. The stay normally stays > shackled to the mast base except in heavier air when I run the shackle > to a ring in the center of the deck. The stay is cable to a series of > blocks that give me 4:1 purchase and aline that runs back to the cockpit > through a rope clutch. Whether you need it or not depends on how much > wind you get. Here on the Chesapeake I rarely use it. During the race > last Sunday however with winds at 16-19, gusts to 24, we put it on when > going upwind and it really helps flatten the mainsail. With the setup I > have it is really easy to release the clutch to take the tension off the > shackle and then run the shackle back to the mast for the downwind run. > I don't know about using Dynema. The thing that bothers me about that > is that at the end of the day, it is still fabric and something sharp > can cut it and destroy it. > > Pat Nevitt > Patriot > C&C 29 MKII > Galesville MD > > > On Thu, Oct 18, 2012 at 7:40 AM, Law Office of Craig Meyerson > <craigmeyer...@yahoo.com <http://mc/compose?to=craigmeyer...@yahoo.com>> > wrote: > > > I installed a traveler track from the mast base to the forward > most point on the deck I wanted the baby stay to reach on my old C&C 34. > Put an adjustable car on the track controlled from the cockpit. Used > dyneema for the stay. Downwind adjusted the car aft to get out of the > way for dip-pole jibing and aft pole adjustment. Worked very well. > Should be helpful for end to end jibing too. The dyneema was on its > fourth season when I sold the boat. > > Baby stay reduces mast pumping upwind, so I would not remove it. > > > Craig Meyerson > C&C 115 Souvenir > > > From: dwight veinot > <dwightvei...@hfx.eastlink.ca<http://mc/compose?to=dwightvei...@hfx.eastlink.ca> > > > To: cnc-list@cnc-list.com<http://mc/compose?to=cnc-list@cnc-list.com> > Sent: Wednesday, October 17, 2012 6:28 PM > > Subject: Re: Stus-List Dyneema baby stay > > > Won't be much easier > > Dwight Veinot > C&C 35 MKII, Alianna > Head of St. Margaret's Bay, NS > > -----Original Message----- > From: CnC-List > [mailto:cnc-list-boun...@cnc-list.com<http://mc/compose?to=cnc-list-boun...@cnc-list.com>] > On Behalf > Of > dre...@gmail.com <http://mc/compose?to=dre...@gmail.com> > Sent: October 17, 2012 10:10 AM > To: cnc-list@cnc-list.com<http://mc/compose?to=cnc-list@cnc-list.com> > Subject: Stus-List Dyneema baby stay > > Hi, > > I am looking for a solution to help make my baby stay more > easily removable. > I presently have a standard 1x19 SS cable turn buckle set up, > and I plan to > install a pelican-like hook attachment. I have a colleague who > is > replacing his SS lifelines with Dyneema line. This got me to > think about > using Dyneema for the baby stay. Does anyone have any > experience in using > a Dyneema solution for any rigging arrangements? > > > - > Paul E. > 1979 C&C 29 Mk1 > S/V Johanna Rose > Carrabelle, FL > > > _______________________________________________ > This List is provided by the C&C Photo Album > > http://www.cncphotoalbum.com/ > > CnC-List@cnc-list.com <http://mc/compose?to=CnC-List@cnc-list.com> > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2221 / Virus Database: 2441/5336 - Release Date: > 10/16/12 > > > _______________________________________________ > This List is provided by the C&C Photo Album > > http://www.cncphotoalbum.com/ > CnC-List@cnc-list.com <http://mc/compose?to=CnC-List@cnc-list.com> > > > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com <http://mc/compose?to=CnC-List@cnc-list.com> > > > > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com <http://mc/compose?to=CnC-List@cnc-list.com> > > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com <http://mc/compose?to=CnC-List@cnc-list.com> > > > > -----Inline Attachment Follows----- > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com <http://mc/compose?to=CnC-List@cnc-list.com> > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > >
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