I keep a similar rig aboard my boat. I keep two lines with SS carabiners in the 
end and I call them "barberhaulers" from some sailing book I read back in the 
80's. They can be used to pull the genoa clew out to the toerail or as 
preventers attaching to a loop rigged on the boom to the vang fitting. The end 
boom arrangement can be instituted for heavy air, but we like convenience of 
this mid boom arrangement as it works well, is quick and easy. The vang, 
mainsheet and preventer work together to hold the boom steady, no play, no 
wear, no shock load.

Chuck S, Resolute, 1990 C&C 34R


> On March 16, 2019 at 2:12 PM "Dennis C. via CnC-List" <cnc-list@cnc-list.com> 
> wrote:
> 
>     Touche' has a multipurpose line we use as an outboard sheet for the genoa 
> and as a preventer.  It's just a line with a snap shackle on one end.  
> 
>     Our racing main is loose footed.  We just wrap the line around the boom 
> 2/3, 3/4 or so of the way out, take it to a snatch block on the toe rail then 
> back to a free winch somewhere.  We keep the line taut using the winch and 
> mainsheet.
> 
>     For the outboard sheet, we clip the snap shackle to the soft shackle on 
> the genoa clew, take the line to a snatch block on the toe rail and aft to 
> the secondary winch.  Our rule is when the regular jibsheet starts bending 
> over the lifeline, we switch to the outboard sheet.  Our boats like to 
> "breathe".  Open the slot and gain a fraction of a knot.
> 
>     There shouldn't be a lot of pressure on the line on either situation.  In 
> the case of the preventer, you shouldn't allow the wind to get strongly on 
> the forward side of the main.  That's up to the driver.
> 
>     Dennis C.
>     Touche' 35-1 #83
>     Mandeville, LA
> 
>     On Sat, Mar 16, 2019 at 10:44 AM David Knecht via CnC-List < 
> cnc-list@cnc-list.com mailto:cnc-list@cnc-list.com > wrote:
> 
>         > >         I have been thinking aobut rigging a preventer on my boat 
> so re-read this old discussion of how people rig them. End boom attachment 
> sounds preferable, but does that have to run outside the shrouds?  If so, 
> then you would have to rig it before letting the main out while you can 
> stlill get to the end of the boom.  Then, how do you gybe when you want to?  
> > 
> > 
> > 
> > 
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