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Paul,
In the owner's manual it talks about
the main having a "shelf foot" under the section labeled "SAN JUAN 23 INVENTORY". In order to have
an airfoil shape (cross section) down towards the bottom of the sail, it has to
have a certain bagginess to it. It is the same way on an airplane.
The root of the wing is thicker and longer than the tip of the
wing.
That's my story, and I'm sticking to it!
RR
Peace,
Eric
Bob -
I have the foot pulled tight and it still has the sag, almost like
a
very elongated pouch. The boat moves OK in light air with the
150 jib, but the baggy main has always been a curiosity.
Thanks,
Paul
****************
----- Original Message -----
From: Bob
Schimmel
Sent: Friday, August 02, 2002 8:28
PM
To:
sanjuan23@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: Mainsail Slider slug
placement
Paul Hensler wrote:
> Patrick - I switched from
the bolt rope after a year with my used
> SJ23. I took thesail
to a sailmaker and he knew just what to use, but
> I'm not sure
whetherthe slides are plastic or nylon. With the slides,
> it
was much easier than meclinging to the mast and messing around with
>
the old bolt rope, and therewas not much of a loss in trim with the
>
luff not being quite as tight as itused to be. Since we're on the
>
subject - I've always wondered why the foot of themain is so baggy.
>
The sail isn't stretched, it seems that it was made thatway. Could
if
> be because it's a "West Coast" boat? My sailing buddyknows
the ins
> and outs of small sail boats, but he can figure it
>
outeither. Regards,Paul
Hensler#426**************
>
>
----- Original Message -----
> From:
Chuck Vande Wetering
> Sent: Friday,
August 02, 2002 11:30 AM
> To:
SanJuan23list
> Subject: Mainsail Slider
slug placement
>
>
>
>
----- Original Message -----
> From: "P.
Wm. Burke"
<burkesfarm@xxxxxxxxxxx>
> To:
<wwp62@xxxxxxxxxxxxxxx>
>
>
>
> Dear Chuck,
>
>
> > I
purchased my 1978 sail #149 SJ 23 in March this
year
> and have
enjoyed
> > her to date. I've been
busy upgrading and restoring her
> but
have a few
> > questions on my next
project. I installed lazy jacks and
>
now need to
>
improve
> > the mainsail operation.
I've been inserting the luff rope
> in
the slot of
>
the
> > spar and now want a better
system. I wanted to install a
> mainsail
slider
> > system but found out
because of the teardrop cross section
>
shape of the
> > mast, most systems
cannot be applied . Do you have any
>
suggestions? Slugs
> > seem to be the
option. What are the differences
between
> plastic and
nylon
> > slugs. What size slug do I
need. How many slugs and what
> are the
positions
> > of placement on the
sail. Do I need to take the sail to a
>
loft for
> > modification. Any other
comments or options are gladly
>
appreciated.
>
>
> > Yours
truly,
> >
Patrick
>
>
>
>
>
>
>
>
>
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>
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Paul:
The reason why the foot of the
mainsail is so baggy is to create "lift"
to move the boat in very light
air. When the wind is blowing hard, you
pull out the clew to
flatten the foot. These are the two extremes. You
adjust the
foot tension in proportion to the wind strength.
Kind
Regards
Bob Schimmel
(Always stay
curious)
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