[Rhodes22-list] Question for James Wilson on sail trim

[Peter Thorn]

Mark,

Good stuff, man!  I printed Gentry's "how to" article and plan to apply that
telltale method to Ravens 135 and Mack IMF main.  I wonder how much
disturbance the fat IMF mast shadows on the main?   I suppose the telltales
will tell.

PT

----- Original Message ----- 
From: "Mark Kaynor" <mkaynor at gmail.com>
To: "'The Rhodes 22 mail list'" <rhodes22-list at rhodes22.org>
Sent: Monday, July 18, 2005 8:54 AM
Subject: RE: [Rhodes22-list] Question for James Wilson on sail trim


Bill,

I just found the original Tayana list post on the Arvel Gentry system - the
guy who wrote it (the "Roger" of the list) says "I got introduced to these
articles (then top secret info) by several crew members of Americas Cup
boats in the 70s-80s ..... and from then on I hardly ever got less than a
second place when racing."

Mark



-----Original Message-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of Bill Effros
Sent: Saturday, July 16, 2005 9:44 PM
To: The Rhodes 22 mail list
Subject: Re: [Rhodes22-list] Question for James Wilson on sail trim

I have tell tales marching across my 175 jib.  They tell an interesting
tale.  I probably have a dozen of them on each side, in 2 horizontal rows,
and it is possible to get them all lined up, the way they are supposed to
be.  This is good to know, because usually they are not all lined up.

I've never seen another sail with as many tell tales as I've got.  My sail
looks more like the illustrations in the magazines.  But one look at it, and
you know right where the problem is with your sail shape.
Correct the tell tales, your boat speed goes up every time.

Bill Effros

James Wilson wrote:

>Thanks for taking the time to post on sail trim,expect a few questions
>after I've had time to try some of this out.
>Jerry
>
>
>Without a doubt,  telltale installation and utilization are the single most
cost efficient performance upgrade you can possibly make to any boat.
>
>
>
>The very same theory also works quite well on Headsails as well.  Only the
method of altering the twist alters.  Jib sheet tracks and cars do the trick
here,  with moving cars aft to increase twist, and fore to reduce.  of
course the tracks also have other effects such as moving draft af the sail
around a bit too.
>
>
>
>In circumstances where the traveler is not able to reduce twist enough to
make all of the telltales stream aft (Such as when sailing off the wind
significantly)  there are other tricks one can employ.
>
>
>
> Boom vangs do not always have to attach from the boom to the mast.
> The advantage of that setup is it works on every point of sail.
> However it does pose a potential problem with Pop tops.  The downside of
the boom to mast connection of a Vang is that much of the force genearted by
the block and tackle is wasted as compression force of the boom into the
goosenck on the mast.  Pressure can easily be high enough to sheer
goosenecks not up to the challenge.  Esp. as wind forces pick up.  Improved
geometry can be obtained that redirects most of the effect to tightening the
Leach alone by having several strategically placed and BEEFY pad eyes along
the gunnels.  The block that would normally attach to the mast should have
some sort of quick release shackle so it can be attached to the most
advantageously located padeye.  The the vang can be tightened down. You do
have to remeber to release and relocate as necessary before tacking and or
gybing though.  In this configuration, the vang also functions as a
Preventer.  However,  typically when rigging a preventer the goal is to have
the deck attachment as low as possible so as not to prevent the boom from
rising.  Mostly important in Boisterous seas with propensity for the boom to
come in contact with Water.
>
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>
>
>

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