[Rhodes22-list] UPS and sail trim

[Wally Buck]

Mark,

Thanks I bookmarked site. I also have "Sail Trim Guide". Great book with 
good drawings.

Wally

>From: "Mark Kaynor" <mkaynor at gmail.com>
>Reply-To: The Rhodes 22 mail list <rhodes22-list at rhodes22.org>
>To: "'The Rhodes 22 mail list'" <rhodes22-list at rhodes22.org>
>Subject: [Rhodes22-list] UPS and sail trim
>Date: Fri, 10 Jun 2005 12:33:42 -0400
>
>All,
>
>Just before we left Blacksburg for Deltaville I was just going through some
>back issues of Cruising World and came a cross a three articles in the May
>(I'm pretty sure it was May) issue regarding light wind sailing. They
>discuss code 0 sails like the Doyle UPS, and have some good downwind /
>lightwind techniques.
>
>In the same vein, this web site has been being discussed on the Tayana site
>and seems like it would be of benefit to any sailor who wants to learn how
>to better trim their sails: http://www.arvelgentry.com/index.html
>
>The fellow who posted the link included the following:
>
>I've mentioned several times about the precision of sail trim and its ease
>in doing so.
>The following URLs are the recently recompiled Arvel Gentry website that
>contain the 'seminal' articles of the aerodynamics of sails written by the
>penultimate sailor/aerodynamicist that radically changed the way that
>sailors interpret the flow, trim and other 'goodies' about sails.  Gentry
>was the one who 'de-bunked' the slot effect, and perhaps is the ONLY one 
>who
>correctly explained the interaction of a staysail flown under a genoa.
>Gentry's articles 'revolutionized' the way sailors interpreted and set 
>their
>sails, and in effect was the 'secret weapon' used by the American entries 
>of
>the America's Cup boats .... you remember back when the US boats WON.
>
>And
>
>The articles on "Gentry Tufts"  (sail trim, better close winded, etc.) that
>appeared in Sail Magazine were the 'landmark'.  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.  Gentry was the 'aero' consultant to the American
>ACup boats for about 15 years. Those AC boats weren't better than their
>competitors, they were 'sailed better' due to the Gentry Tufts, etc.
>More importantly the 'tuft system' will allow you to keep sailing your
>Tayana when other boats are either turning on their engines ... or are
>heaving-to.
>
>FYI, for those that are strictly non-technical the "Sail Trim Guide" by Don
>Guilette (a world class C30 racer) is a wonderful guide to sail trim and
>shaping. Don took the Gentry articles and boiled them down into *very*
>simple and easy to understand directions (without lengthy explanation) ....
>available from www.sailboatowners.com.  Don's guide will promote good sail
>draft location, proper amount of sail draft, as well as other important
>trim/shape considerations (twist, etc.) .   Well worth the few $$.
>
>Mark Kaynor
>
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