[C320-list] Jib Sheets Jamming - only a symptom

[hcreech at comcast.net]

Scott, 
I agree that covering stainless with rigging tape is not a good idea but disagree about leather. Leather is breathable and dries quickly.  I have been using leather covers for three seasons without any problem, and don't have a problem with sheet jamming when they are on.  Since they attach with velcro they are easily removed and re-installed.  I do remove them at the end of every season and re-install them in the Spring.
Herb Creech
Cloud Chaser #606
 -------------- Original message ----------------------
From: Scott Thompson <sthompson at toad.net>
> Only the first solution listed below -- narrowing the span of the toggle 
> and using a shorter clevis pin -- actually solves the underlying 
> structural engineering problem.  Don't forget that the reason the jib 
> sheets jam is because the toggle is not properly sized for the chain 
> plates in the first place and so the jib sheets get caught under the 
> excess span of the clevis pin.  This structural problem could have more 
> serious consequences for the rig, because it leads to either uneven 
> loading on the two sides of the toggle or an unsupported bending load on 
> the clevis pin, or both.  I don't know if this is actually a problem, 
> since the toggle and clevis pin might very well be overbuilt for the 
> application.  But I'd keep an eye out for signs of bending, distortion, 
> or stress cracks on both the toggle and the clevis pin.
> 
> Covering these parts with tape or plastic or leather isn't very good for 
> them either, because these can retain moisture, and stainless tends to 
> corrode faster when exposed to stagnant, poorly oxygenated water.  If 
> you cover them up, be sure to regularly remove the covering to inspect 
> for corrosion.
> 
> To the person who asked what a toggle is, it's the inverted U-shaped 
> piece of metal that attaches the bottom of the turnbuckles to the 
> chainplates.  The design allows for flexibility in the connection by 
> letting the turnbuckles pivot fore-aft on the clevis pin and laterally 
> on the toggle.  This lets the shrouds, turnbuckles and swages line up 
> with their primary loads and not be subjected to bending loads, which 
> would otherwise lead to premature failure.
> 
> Scott Thompson
> Surprise, 653
> 
> Stanley Rogacevicz wrote:
> >   A third is to insert a small block of wood between the clevis and
> > chainplate on the inboard side to keep the clevis inboard and also place
> > a small block between the clevis and the deck to make an absolutely hump
> > free transition from deck to clevis on the outboard side then wrap the
> > whole thing with tape. The very smooth transition from deck to clevis on
> > the outboard side is shown in the picture on the c320 site I mentioned
> > the other day but the block to keep the clevis in place inboard is not
> > visible.
> > Stan
> > (formerly) Christy Leigh
> > c320 #656
> > Wickford/Narragansett Bay RI  
> > 
> >>>> jvanvessem at sbcglobal.net 5/12/2006 10:38 AM >>>
> > Richard,
> >    
> >   I have seen two solutions to this problem.  One is to squeeze the
> > clevis togeather with a channel lock and insert a shorter pin.  The
> > other is to insert washers to fill up the space between theclevis.
> >    
> >   John (Sojourn 645)
> > 
> > "Richard A. Walker" <dickwalker at att.net> wrote:
> >   I have from time to time a problem with my jib sheets jamming under
> > the
> > shroud turn buckles on the deck. What seems to be the obvious solution
> > is
> > to put 1" vice the 2" clevis pins. 
> > 
> > Has anyone made this change?
> > 
> > Cheers,
> > 
> > Dick Walker
> > C-320 (687) WindWalker II
> > 740 Olive Ave.
> > Coronado, CA 92118-2136
> > 619.435.8986
> > 
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> > 
> > John Van Vessem
> > Sojourn 645
> > Vallejo Yacht Club
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