Join Date: Feb 2000
Location: Annapolis, Md
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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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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay