Is my jib/genoa toast? - SailNet Community

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  #1  
Old 05-27-2008
DrB DrB is offline
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Is my jib/genoa toast?

I have a 135 jib/genny on my P10M. No matter what I do, I can't seem to stop sail leech from luffing. I have cranked down on the leech line, moved the cars, adjusted the jib main; nothing seems to work. It luffs on all points of sail, close hauled, reach run, etc. I can get the three tell-tales all to fly straight back with proper sail trim, but the leech is still luffing.

Ideas?

Thanks in advance.

Bill
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Old 05-27-2008
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What's a jib main????

Is it luffing, (which I kind of doubt) or fluttering/motoring? If it is the latter and you can't seem to stop it no matter what it may be because the sail has lost its proper shape.
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Old 05-27-2008
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Fluttering/Flapping

Sorry for the terminology. Trailing edge of the jib is fluttering/flapping, even when telltails are all straight back on the leading edge.

Jib Main = Jib Halyard. Sorry, my brain does not seem to be working.

DrB
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Quote:
Originally Posted by DrB View Post
I have a 135 jib/genny on my P10M. No matter what I do, I can't seem to stop sail leech from luffing.
It could be "blown." How old is it , how much service has it seen, and under what kinds of conditions? (Btw: Leeches don't luff.)

Quote:
Originally Posted by DrB View Post
I have cranked down on the leech line, moved the cars, adjusted the jib main; nothing seems to work.
Start over. Ease the leech line. Now draw an imaginary line from the mid-point of the jib's luff, through its clew. That line will point to where you should start with your foresail cars. Then, under sail, examine your tell-tales. If the top ones flutter (in tandem) before the bottom ones, you have too much twist at the top of the sail. Move the cars forward. If the bottom ones flutter before the top ones, you have too little twist. Move the cars back.

If the tell-tales are all streaming aft pretty much equally, inside and out, top and bottom, and your leech is still fluttering, odds are the sail is a bit (?) blown. You should be able to tighten-up the leech line a bit to eliminate, or at least greatly reduce, the flutter. (Ragging on the leech line is probably counter-productive. If you close-off the leech too much, you'll reduce the performance of the sail.)

We flew our 32 year old #3 (Dacron) Sunday and what I describe above was the procedure I used. (Tho that sail has only one set of tell-tales, so I adjusted the cars by sail shape.) No flutter. And yes: That trusty old #3 is definitely a bit blown.

Btw: I suppose that by "jib main," you refer to the jib sheet(s) or jib halyard? There is no such thing as a "jib main."

Jim
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My guess is that the cloth has stretched to the point you can't get a properly shaped leech... if the sail isn't that old, you could have it recut slightly to reduce the fluttering/motoring of the leech.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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