[Rhodes22-list] IMF outhaul setting

[Peter Thorn]

We're discussing moderate air, right?  Yeah, it does.  You'll go a little
slower too.  For pointing you want flatter main (outhaul) and very little
twist (traveler).  But you still can't change the headsail sheeting angle.
On the R22 the Genoa sheeting angles are not close - the tracks are set on
the rail (moderate air - not forward tracks), so the boat is set up to foot,
not point. So why not go for a full powerful main and foot off a little
faster?  So in the conditions most favorable for pointing (moderate air) the
boat isn't really set up to do that.  But I think that's very compatible
with the keel/cb hull.  If pointing were all that mattered, get a fin keeled
boat and point a lot higher.  But the R22 will make it up over the shoals
and at the boat ramp.


----- Original Message ----- 
From: "William E. Wickman" <wewickman at duke-energy.com>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Monday, December 12, 2005 8:44 AM
Subject: Re: [Rhodes22-list] IMF outhaul setting


>
> Here's another question.  What effect does increasing the draft of the
main
> have on pointing ability?  IE., does a flatter main allow you to point
> higher?
>
> Bill W.
>
>
>
>
>
>              "Peter Thorn"
>              <pthorn at nc.rr.com
>              >                                                          To
>              Sent by:                  "The Rhodes 22 mail list"
>              rhodes22-list-bou         <rhodes22-list at rhodes22.org>
>              nces at rhodes22.org                                          cc
>
>                                                                    Subject
>              12/11/2005 09:16          [Rhodes22-list] IMF outhaul setting
>              AM
>
>
>              Please respond to
>                The Rhodes 22
>                  mail list
>              <rhodes22-list at rh
>                 odes22.org>
>
>
>
>
>
>
> Slim,
>
> We are discussing two outhaul adjustments: a) angle and b) draft.  They
are
> independent of each other.  Since the IMF is a far better way to depower
> than using the only sail controls available on most other small boats
> (outhaul, vang, Cunningham, traveler), I think it makes sense to always
try
> to keep the outhaul angle as bisecting as possible.  This would be the
case
> whether the draft is very tight or very loose.  As you pointed out, the
car
> must move forward to keep the angle bisected as the main is furled and the
> clew moves forward.  A bisecting angle also evenly tensions the luff and
> makes IMF furling go very smoothly.   As most R22 sailors already know,
> Stan's unusual traveler does a fantastic job opening the leech (if that is
> desired).  So that's another reason to just keep it set bisecting.
>
> As far as draft goes, the deeper the draft the more powerful the sail.
I'm
> the type of sailor who wants as much power as possible -- until I'm
> overpowered.  Raven sails nicely upwind in 12-15 with her 135 and main set
> full.  In those conditions I can hold her to about 15 degrees heel and she
> stays on her lines-- it's almost heaven!  With about 10-12" of  outhaul
> eased, the helm is light and balanced.  Of course these adjustments are
> totally subject to the cut of the sail.  Raven's main (2003 Mack Sails),
> has
> a slightly higher clew (which makes for flawless IMF furling), no roach
and
> no vertical batten.
>
> I recall a day last summer in lighter air with the low clew 175 and the
> main
> set more flat.  With this setup having so much power in the headsail and
> the
> main set flat there was definitely some lee helm.  Under those conditions,
> I
> think the main should be as full as possible too.  Stan recently invented
> the new vertical batten main, a bigger sail with more power to balance the
> 175 -- perhaps the ideal rig for light air.
>
> <So my question is what's the distance between clew and spar and under
what
> conditions?>
>
> I think this depends on the cut of your mainsail.  First, furl main, then
> set outhaul car to bisect, then set draft.   You are furling to depower,
so
> I guess you would want the outhaul pretty tight.  The distance between the
> clew and spar would depend more on how high the main clew is and really
> doesn't matter than much.  Raven's high clew main, 40% furled, angle
> bisecting, traveler down all the way leeward for tight leech-- I think
> there's more than 12" of outline line, maybe more.  The significant
factors
> are bisecting and draft tension.
>
> All this detail stuff keeps sailing interesting, doesn't it?
>
> PT
>
>
>
>
> ----- Original Message -----
> From: "Slim" <salm at mn.rr.com>
> To: "Rhodes22-list" <rhodes22-list at rhodes22.org>
> Sent: Sunday, December 11, 2005 2:38 AM
> Subject: Re: [Rhodes22-list] IMF outhaul setting ver 2 for Ed.pdf
>
>
> > Peter,
> >
> > I'm so glad someone finally brought this up.  OK, I understand this
> > geometry--it's the same as adjusting the jib sheet cars so the imaginary
> > line bisects the luff.  I get that.  But in practice, the clew of my
main
> is
> > never more than an inch or so from the spar itself under full sail.  If
I
> > reef in for higher winds, I position the car forward right up close to
> the
> > clew.   And for higher winds, you want the outhaul tight to flatten the
> > sail, right?  So are you talking about very light air when you ease the
> > outhaul?  Still, when I do that, I only ease it a couple inches.  Maybe
I
> > should be easing it a lot more?   And the follow-up
> > question:  if the clew is within a couple inches of the spar, does the
> angle
> > make any difference?
> >
> > Slim
> >
> > On 12/10/05 9:44 PM, "Peter Thorn" <pthorn at nc.rr.com> wrote:
> >
> > > Ed,
> > >
> > > How's this.
> > > Name: IMF outhaul setting ver 2 for Ed.pdf Type: application/pdf Size:
> 84818
> > > bytes Desc: not available
> > > Url:
> > >
>
http://www.rhodes22.org/pipermail/rhodes22-list/attch/200512/10/IMFouthaulsett
>
> > > ingver2forEd.pdf
> > >
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