[Rhodes22-list] Leech and foot line adjustment

[Rick Lange]

OK Mikes,

In the case of the racing sailboat, I expect the jib did not significantly
overlap the main.  So as to which sail exerts the most influence over the
other, the jib influences the main the most with leach air turbulence
hitting the lifting surface of the main forward of the center of force.
Thus, it does make sense to first set the jib.

In the case of the R22 with a big genny, its leach air turbulence hits the
main aft of the main's center of force.  So the main has the most influence
by drawing fast air across the inner surface of the genny.

To see how this works, on a straight course with an 8-12 knot headwind, set
your genny with the main completely furled.  Then unfurl and set your
main.  You'll see the genny foot rise as though a topping lift line was
raising the clew.  Now you have to adjust the genny a second time.

I am an R22 fan because I am a firm believer in lazy sailing.  One
adjustment per sail is all I want to do.

Regards,

Rick Lange


On Mon, Oct 19, 2020 at 11:19 PM Mike Riter <mike at traildesign.com> wrote:

> This is great info guys. Thanks and keep it going!
>
> On Mon, Oct 19, 2020 at 6:29 PM Michael D. Weisner <mweisner at ebsmed.com>
> wrote:
>
> > Hi Rick,
> >
> > For years I felt that the mainsail should be trimmed first, just as you
> > have said.
> >
> > I was lucky enough to crew aboard a sailboat that always won races and
> > watched as the jib was always rough trimmed prior to the main. After
> > adjusting the main, the crew touched up the jib controls. I asked why and
> > the answer was always about the relative position and interaction of the
> > two sails. The main is in the shadow or wash of the larger forwardmost
> sail.
> >
> > I tried the process on my Rhodes 22 and was very surprised that I was
> able
> > to change course faster and get back to speed quicker by paying careful
> > attention to sail shape and deployment of the genoa before I fiddled with
> > the main. One of the most important considerations was the angle of the
> > genoa to the furler. It should be near 90 degrees and result in a very
> well
> > defined curvature. In the past, I had always set the jib sheets much too
> > tightly.
> >
> > I quickly looked for an article as a reference and found this one:
> > http://sailingmagazine.net/article-17-sail-trim-101.html
> > which starts with:
> >
> > "When discussing overall sail trim, it makes sense to start with the
> > headsail for two important reasons:
> >     The jib directs airflow over the mainsail.
> >     The jib itself creates lift and provides a portion of the boat's
> > forward momentum."
> >
> > I am not saying that you must set the genny first, but please give it a
> > try. You might be surprised.
> >
> > Mike
> > s/v Wind Lass ('91)
> > Nissequogue River, NY
> > I’d rather be sailing :~)
> >
> >
> > -----Original Message-----
> > From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> On Behalf Of
> > Rick Lange
> > Sent: Monday, October 19, 2020 3:03 PM
> > To: The Rhodes 22 Email List <rhodes22-list at rhodes22.org>
> > Subject: Re: [Rhodes22-list] Leech and foot line adjustment
> >
> > Hi Mike,
> >
> > I respectfully take issue with your suggestion to set the genoa sail
> > before the main.
> >
> > My training to sail a cutter rig was to first set the inner or staysail
> > first, then the outer or yankee sail.  The logic is that the accelerated
> > airflow over the staysail lifting surface is the greater force exerting
> > more influence on the overlapping yankee than the other way around.
> >
> > Especially with the 175 genny on the R22, the main will have considerable
> > influence on the curvature of the overlapping genny.  So I always *first
> > set the main*, get it to pull as hard as I can per the knot meter, then
> set
> > the genny leach curvature to match the main leach curvature.
> >
> > [image: RevSail2019a.jpg]
> >
> > Regards,
> >
> > Rick Lange
> >
> >
> > On Sun, Oct 18, 2020 at 11:29 PM Michael D. Weisner <mweisner at ebsmed.com
> >
> > wrote:
> >
> > > Adjusting the larger furling genoa can be fairly complicated. One must
> > > determine the optimal location of the jib sheets and cars as well as
> > > the length of the exposed sail. Once this has been accomplished, the
> > > sail shape may be fine tuned through adjustment of the foot and leech
> > > to keep the sail from curling.
> > >
> > > The genoa (headsail) should be adjusted prior to adjusting the
> mainsail.
> > > For IMF rigs this is complicated by the outhaul tension, mainsheet and
> > > traveler adjustments, not to mention sail shape lines.
> > >
> > > A reasonable general explanation on the adjustment of both lines may
> > > be found at:
> > > https://www.precisionsailloft.com/blog/leech-and-foot-lines/
> > >
> > > More specific information may be found in our archives at:
> > > http://www.rhodes22.org/blew_skies/imf.html
> > >
> > > http://www.rhodes22.org/pipermail/rhodes22-list/2005-December/027408.h
> > > tml
> > >
> > > http://rhodes22.org/pipermail/rhodes22-list/2005-June/023989.html
> > >
> > > Most of us have learned through trial and error. This is a great
> > > reason to spend as much time as possible sailing your Rhodes 22. Books
> > > only tell you what should be done. Sailing and making mistakes force
> > > you to learn by correcting your errors.
> > >
> > > Mike
> > > s/v Wind Lass ('91)
> > > Nissequogue River, NY
> > >
> > >
> > > -----Original Message-----
> > > From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> On Behalf Of
> > > Gmorganflier
> > > Sent: Sunday, October 18, 2020 1:27 PM
> > > To: rhodes22-list at rhodes22.org
> > > Subject: [Rhodes22-list] Leech and foot line adjustment
> > >
> > > Hello,
> > >
> > > I’ve spent hours and days looking through the archives for tidbits of
> > > info to help a novice sailor like me to know my boat better and hints
> > > on sailing techniques which I copy and paste into folders on my iPad.
> > >
> > > I had someone at my sailing club point out something on my sails which
> > > I didn’t even know existed nor had I seen discussed in the archives.
> > > My Genoa has a leech line and a foot line which can be adjusted. My
> > > furling main has a leech line.
> > >
> > > How are these used and adjusted? The person who pointed out this
> > > feature to me said it looked while sailing  like my Genoa was cupped
> > > on the leech and I needed to loosen the leech line..does this sound
> > right?
> > >
> > > Thanks,
> > > George Morgan
> > > S/V Knotty Lady 1986
> > >
> > >
> > >
> > > --
> > > Sent from: http://rhodes-22.1065344.n5.nabble.com/
> > >
> > >
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> >
> > --
> Michael Riter
> President, Trail Design Specialists, Inc.
> Lead Instructor, Trail Master and mechanized training
> mike at traildesign.com
> 678-410-8021
>