blocks on mainsail reefing cringles.. - SailNet Community
 
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post #1 of Old 06-21-2013 Thread Starter
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blocks on mainsail reefing cringles..

Hi,
I put in two reefs with single line reefing each.
Im discovering what most of you already know, the friction problem.

So one thing I am planning is to put small blocks on each cringle.

How do most people attach the block in the cringle?
Also, what loading should I expect (I want the smallest blocks possible)?

thanks,
groundhog
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post #2 of Old 06-21-2013
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Re: blocks on mainsail reefing cringles..

You would be way ahead of the game going to two-line reefing instead. The advanatage of two line systems are fewer moving parts, way less friction, you can adjust your foot tension independent of your luff tension, less line to haul, way faster to put in, no chance of jambing, and you don't have to take your boom apart periodically to get to the tackle hidden in your boom. I have taken a single line reef off a 25 footer I owned after the second time it jambed inside the boom in ugly conditions.

Otherwise to answer your question, the blocks at the kringles are stitched to a strop. The loads are pretty big because there is usually a reverse mechanical advantage on these blocks.


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Re: blocks on mainsail reefing cringles..

hmm...
What about one of those stainless rings on the far side of the kringle and the block on the reefing side?

Then, next time I see a sailshop, i get the stitching done?
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Re: blocks on mainsail reefing cringles..

I also saw those Goiot Kringle blocks (sailingdog showed them here). But my kringle is 45mm in diameter and their data sheet shows only 25 and 35 mm models.

plus you cant seem to actually purchase these things... they are only a legend.
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Re: blocks on mainsail reefing cringles..

Its easy enough to buy some stropping and stitch it yourself. You can put a D ring on one side and stitch in the block on the other.

Wait a minute....I just noticed: 45mm is a huge Kringle. That is huge. What size boat are we taking about here?


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Re: blocks on mainsail reefing cringles..

only 27 foot.

Wait... i think i miscalculated on my kringle measurement.
Looks like about 25mm diameter.

So I could use those goiot cringle blocks if it was actually possible to buy them.

I just discovered soft shackles and tylaska spools.
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Re: blocks on mainsail reefing cringles..

actually, closer to 20mm diameter opening
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post #8 of Old 06-22-2013
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Re: blocks on mainsail reefing cringles..

Have you thought about using a dyneema type line? Much slippier than normal double braid (if you're using that).

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post #9 of Old 06-22-2013
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Re: blocks on mainsail reefing cringles..

Agree with Jeff. Bought my boat with a single line reefing setup and often needed to venture to the mast to untangle the reefing line. Cut the blocks off the main sail luff and installed two line reefing (see Harken) ; just like Jeff says its way better. It could be that different boats behave differently, donít know, but in my case of a fractional rig and dominant main the ability to independently tension the tack and clew resulted in a good looking reefed main sail rather than a baggy main sail. The time it takes to reef is also quicker and I canít fathom why anyone would want single line reefing, or, am I missing something.
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