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

[Scott Thompson]

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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