[Rhodes22-list] Slot effect

[Bob Weber]

Slim, your answer yes, no is completely correct.  That will work just fine.  
If you wanted to milk more speed out of it you would slowly trim to that 
position building up boat speed (almost a mute point in the R-22 compared to 
more dedicated race boats) and there by add a couple knots of "apparent 
wind" created by forward motion of the  boat.  For simplicity just get in 
the habit of trimming the genny and then the main since it is effected by 
the airflow from the genny.  Hope it helps and gets your brain working thru 
the endless physics which come into play as you slowly move along sipping 
beer.  COME ON SPRING.  BW

>From: Steve Alm <salm at mn.rr.com>
>Reply-To: The Rhodes 22 mail list <rhodes22-list at rhodes22.org>
>To: Rhodes <rhodes22-list at rhodes22.org>
>Subject: Re: [Rhodes22-list] Slot effect
>Date: Wed, 02 Mar 2005 14:24:34 -0600
>
>Bob,
>
>When I'm pointing in light enough air so that I can use my entire 175%,  I
>sheet in the genny as far as it will go--that is, the clew is touching the
>sheet block and the block car is in its aftmost position.  Then I take the
>traveler to weather and sheet in the main until the boom is right on the
>centerline.  In other words, both sails are as close hauled as they can be.
>I want to trust the engineering of the boat itself that this configuration
>will create the perfect slot.  Yes?  No?  Maybe?  How do you know when it's
>right?
>
>Slim
>
>On 3/2/05 1:50 PM, "Bob Weber" <ruba1811 at hotmail.com> wrote:
>
> > Ed, I don't know about filling your mailbox but here goes.  Al Gore 
>claims
> > to have invented the "slot effect" right before the internet to replace 
>our
> > dependance on neuclear energy (could not resist).  If you don't care 
>about
> > going fast, forget about it.  Racers are concerned about the slot effect
> > particulary when sailing to weather.  The slot they are talking about is 
>the
> > area between the jib or genny and the back side of the main.  Wind comes 
>off
> > the windward side of the headsail and is funnelled behind the main.  It 
>is
> > sort of a "Venturi" effect which is supposed to increase wind speed over 
>the
> > leeward side of the main causing more lift to the main.  Why you would 
>care
> > about this comes in trimming the sails for maximum speed and pointing
> > ability.  After tacking on a close hauled course, the speedsters will 
>have
> > the genny and main eased slightly to build boat speed and then start 
>trimmng
> > in the sails for close hauled.  Fast boats call this shifting thru the
> > gears.  The slot effect dictates that you make your final adjustment to 
>the
> > Genny prior to the main since it is effected by the air comming off the
> > genny.  Ok, it is not that exciting but if you ever find yourself 
>crewing on
> > a racing boat you will understand the order of operations (genny then 
>main)
> > in sail trim and the idea behind it.  Any more information will reveal 
>my
> > ingornance and disdain for sailing fast so I will stop.
> >
> > Bob
> >
> >> From: "ed kroposki" <ekroposki at charter.net>
> >> Reply-To: The Rhodes 22 mail list <rhodes22-list at rhodes22.org>
> >> To: "'The Rhodes 22 mail list'" <rhodes22-list at rhodes22.org>
> >> Subject: RE: [Rhodes22-list] Bob Weber's Challange
> >> Date: Wed, 2 Mar 2005 14:22:03 -0500
> >>
> >> Bob:
> >>
> >> ""You may now define 'Slot' effect."----are you serious?  It is one of 
>my
> >> favorite topics.  Don't get me started! It actually is a good sailing 
>topic
> >> since there still some debate on the "effect" despite wind tunnel
> >> technology
> >> and the like.  Any Mainsail trimmers want to jump in?  Bob""
> >> Of course, I am serious, for several reasons.  Notwithstanding the
> >> temperatures, in the last two weeks people have been bringing up 
>sailing
> >> topics.  Why not discuss a real topic?
> >> I will be off the list for about three weeks.  In the past month we
> >> have had a couple of cabin fever snarling clashes on the list.  This 
>topic
> >> will get away from nuclear power, other sailboats, Hilary, etc., etc.
> >> It would be nice to still find the list here at the end of the month 
>when I
> >> get back.
> >>
> >> Ed K
> >> Greenville, SC, USA
> >> Addendum:  Post a picture of a vang for the GBI IMF.
> >>
> >>
> >>
> >> __________________________________________________
> >> Use Rhodes22-list at rhodes22.org, Help? www.rhodes22.org/list
> >
> >
> > __________________________________________________
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>
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