[Rhodes22-list] Sailing right angles

[Rick]

Cary, your answer clearly points to the main sail, not the foresail, as the
main problem of pointing with an IMF rig.

Phil Rhodes designed the boat to carry a standard mast and main with the
center of force directly over a vertical centerboard.  This allowed
pointing at 40 deg, or even less, off the wind.

When Stan put on the IMF mast, that pulled the sail plan center of force
aft, requiring the centerboard to be set aft as well.  The smaller size and
sloppier shape of the furling main are probably the main factors.

Introducing the diamond board set things right again with an IMF, at least
as far as balance resulting in a neutral helm.  If you look at a diamond
board all the way down, it looks like a centerboard 3/4 of the way down.
But still, the center of force remains too far aft for the hull design to
point very high.  Tilting the mast forward by putting weight forward and
shortening the forestay helps some, but the foresail itself has little to
do with it.

Single handed, I can point at 45 deg in rare ideal conditions (a steady
10-12kt wind and no waves) with the pop top down and sitting forward in the
cockpit using a 170 genny.  In this perfect situation, I tack with the
autohelm through 100 deg and when the boat regains speed, come back up 10
deg.

The only advantage I can see with the 130 genny is better sail shape at
higher wind speeds.  For my money, the 170 works best in most of the
situations I am comfortable sailing these days.

Rick

On Mon, Jun 6, 2016 at 11:39 AM, Cary Tolbert <retiredtoby at gmail.com> wrote:

> Rick, I do have an IMF Mast and sail.
> Richard, when I installed the 130 I did move the the sheeting points as far
> forward on the track as they would go. It just seemed the correct thing to
> do, though I had no known reason for doing this. I will always take luck
> when she shows up, with a smile and without question.
> Cary
> s/v Whisper
>
> On Mon, Jun 6, 2016 at 11:05 AM, Richard Beytagh <rbeytagh at gmail.com>
> wrote:
>
> > Firstly, it should be 5 gallon jug of Rum that you use as ballast.
> > Secondly, did you move the sheeting points forward? With my 130% the cars
> > are right at the forward end of the traveller.
> >
> > Cheers
> >
> >
> >
> > ~~~ _/) ~~~
> >
> > Richard Beytagh
> > Phone: 828 337 0180
> >
> > On Sun, Jun 5, 2016 at 7:48 PM, Chris Cowie <ccowie at cowieassociates.com>
> > wrote:
> >
> > > I have been frustrated with not being able to sail any better than
> about
> > > 110-120 degrees on a close haul.  I made several adjustments recently
> and
> > > am
> > > happy to report being able to tack in the nineties.  First changed
> from a
> > > 180 to a 130 head sail, then lost five pounds, added a five gallon jug
> of
> > > water ballast forward of the v berth and tightened the aft stays.  I
> > think
> > > Phillip Rhodes did not  take into account the extra motor and gas can
> > > weight
> > > most of us add to the aft end of our boats and I think the added water
> > > balast helps balance the boat.  I was able to test this at low tide on
> > the
> > > potomac River having sailed down wind toward the national mall and
> > needing
> > > to make my way back up wind toward Alexandria va in a very narrow deep
> > > water
> > > area to re enter the channel back to my marina at the national sailing
> > > marina  this past Saturday.  Next trick is to replace my wooden tiller
> > with
> > > that nice new shinny fiberglass one to make the boat go faster.  If
> that
> > > doesn't work I will resort to more rum in memory of our great rummy.
> > >
> > >
> > >
> > > -----
> > > Christopher P. Cowie
> > >
> > > 4400 MacArthur Blvd, NW
> > > Suite 300
> > > Washington, DC 20007
> > > 202.342.2711 ex.204 ● 202.342.2691 fax ● 202.270.1470 mobile
> > > [ccowie at cowieassociates.com]
> > >
> > >
> > >
> > > --
> > > View this message in context:
> > >
> http://rhodes-22.1065344.n5.nabble.com/Sailing-right-angles-tp52048.html
> > > Sent from the Rhodes 22 mailing list archive at Nabble.com.
> > > __________________________________________________
> > > To subscribe/unsubscribe go to
> > > http://www.rhodes22.org/mailman/listinfo/rhodes22-list
> > >
> > > For the list Charter and help with using the mailing list and archives
> go
> > > to http://www.rhodes22.org/list
> > > __________________________________________________
> > >
> > __________________________________________________
> > To subscribe/unsubscribe go to
> > http://www.rhodes22.org/mailman/listinfo/rhodes22-list
> >
> > For the list Charter and help with using the mailing list and archives go
> > to http://www.rhodes22.org/list
> > __________________________________________________
> >
> __________________________________________________
> To subscribe/unsubscribe go to
> http://www.rhodes22.org/mailman/listinfo/rhodes22-list
>
> For the list Charter and help with using the mailing list and archives go
> to http://www.rhodes22.org/list
> __________________________________________________
>