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

[Bill Effros]

Thanks, Mark,

I don't have time to follow up on it right now, but you know I will.  I 
took a look.  Looks interesting.

Also interesting is that every list I've been on has a Roger.  The 
engineering types seem to love the email forum because it gives them a 
social outlet outside their normal circles in which they can ply their 
specialty.

Bill Effros





Mark Kaynor wrote:

>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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>  
>