That's where the pumping in the mast which we've been talking about comes in. Some of the discussion has been theory and some of it has been practice. In theory a bendy mast can pull the luff forward. In practice our boats experience a stabilized mast and less pumping.
I have check stays which further bend the mast and in theory further flatten the main but in practice simply reduce pumping more. In theory even just a little belly in the mast flattens the main...some. If the mast is pumping then it is by default bending. I would say that if you find yourself in heavy weather with good chop, release the baby stay, step forward to the mast and sight it from the side. You may need the side stays as a reference point. You'll probably notice the mast bending fore and aft at the middle by about and inch or two. The action of the boat and helm will be more aggravated. Now pull the babystay taught and sight the mast again. You should notice a reduction in the pumping and the action should calm down. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On May 19, 2017 1:35 PM, "Jim Reinardy via CnC-List" <cnc-list@cnc-list.com> wrote: > Forgive my ignorance on this, but do your boats have a bendy mast? My > 30-2 has a baby stay with a 4:1 purchase, but I can't get much movement out > of the rig with it at all. We use the Cunningham quite a bit, but the baby > stay is collecting dust. > > Jim Reinardy > C&C 30-2 "Firewater" > Milwaukee, WI > > -------- Original Message -------- > Subject: Re: Stus-List Baby stay vs Cunningham? > From: "Hoyt, Mike via CnC-List" <cnc-list@cnc-list.com> > Date: Fri, May 19, 2017 5:21 am > To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> > Cc: "Hoyt, Mike" <mike.h...@impgroup.com> > > Josh > > You are correct. Baby stay is designed to help with mast pumping. A side > effect may be that bending mast opens leech somewhat. Since babystay is > usually only used in windy conditions opening the leech is not such a bad > thing. > > On fractionally rigged boats which most C&Cs and our Frers unfortunately > are not backstay is ALL ABOUT main sail and really opens leech. Has much > less effect on forestay tension than on masthead boat. The C&C 115 was > fractional (more or less) and had a really bendy mast. The main was very > easily shaped with all the controls. Going to masthead rig on Frers after > years of trimming main on Niagara 26, J27 and C&C 115 made the main seem > awkward and clunky for quite some time. It is a lot more work to trim it > effectively (IMO) > > Back to our original point. Opening or closing leech is a major tool in > trimming main sail. A tight sheet and vang does close the leech but wind > it is usually bending mast that is a tool used to open leech vs in light > wind > > Mike > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com > <cnc-list-boun...@cnc-list.com>] *On Behalf Of *Josh Muckley via CnC-List > *Sent:* Thursday, May 18, 2017 4:39 PM > *To:* C&C List > *Cc:* Josh Muckley > *Subject:* Re: Stus-List Baby stay vs Cunningham? > > Mike I believe you are correct but isn't that simply a side effect? Leech > tension and sail twist should be controlled by the mail sheet and vang. In > fact I think the opening of the leech is experienced more with changes in > backstay tension as a result of changing the position of the masthead. > > Correct me if I'm wrong but I think that your statement is metaphorically > equivalent to saying, "The backstay controls main sheet tension." True the > backstay can affect main sheet tension, but that's not its purpose. > Likewise, bending the mast can open the leech but that's not its purpose > and the components designed to control the leech (vang and mainsheet) are > still available to "close" it. Kind of a does the tail wag the dog > situation. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > On May 18, 2017 9:00 AM, "Hoyt, Mike via CnC-List" <cnc-list@cnc-list.com> > wrote: > And bending mast would also open leech > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *Josh > Muckley via CnC-List > *Sent:* Thursday, May 18, 2017 9:52 AM > *To:* cnc-list@cnc-list.com > *Cc:* Josh Muckley > *Subject:* Re: Stus-List Baby stay vs Cunningham? > > Cunningham does flatten the sail but simply due to luff tension. > If a baby stay is able to pull the belly of the mast forward then the luff > is also pulled forward and the resulting shape of the sail is flatter. > Josh > > On Thu, May 18, 2017, 8:18 AM Hoyt, Mike via CnC-List < > cnc-list@cnc-list.com> wrote: > > Doesn't the cunngham assist the halyard in moving draft forward? > > -----Original Message----- > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dave S > via CnC-List > Sent: Wednesday, May 17, 2017 10:43 PM > To: C&c Stus List > Cc: Dave S > Subject: Stus-List Baby stay vs Cunningham? > > Both depower the main.... Does the adjustable baby stay (mast bend) make > the Cunningham (luff tension) redundant? > I have an adjustable baby stay, is adding a Cunningham a waste of time? > > Thanks , Dave > 33-2 > > Sent from my iPhone > _______________________________________________ > > 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! > > > _______________________________________________ > > 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! > > > _______________________________________________ > > 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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