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post #19 of Old 02-12-2011
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Originally Posted by GeorgeB View Post
The ... photo illustrates the problem with single line reefing. The reefing line suffers friction going through the new cringle, making for more tension on the tack than the clew. Unfortunately, most of the force is on the clew. I rigged a Harken Carbo Block to reduce that friction, but unfortunately, now have a point of chaffe in my system. The solution for that is to cut new exits on the bottom side of my boom, but the extra slots will weaken the boom just where you want it to be strong. One solution begets a new problem…

Originally Posted by svHyLyte View Post
In the ... photo, the forward angle forced on the reefing line by the bull's eye block on the mast immediately below the boom pulls the turning block connected to the cringle strap at the luff forward, causing the line to run over the forward edge of the exit slot on the top of the boom. This arrangement introduces a lot of unnecessary friction to the system and will cause the line to fail at the slot in the boom due to chafe in any extended blow. Eliminating the bull's eye block below the boom will eliminate these problems and create a fairer lead to what I assume is a turning block at the mast base. Single line reefing sustems are great in theory, in practice, not so much.
The Problem with svHyLyte's suggestion is that you need a forward pull on the tack line, otherwise all the pressure of the sail will come on the first luff slide above the reef.

Here's one possible solution -- add a small block on a strop to the top of the boom to help re-direct the reef line so as to avoid chafing against the edges of the sheave box:

Peterson 34 GREYHAWK, West Boothbay Harbor, Maine

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