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Old 04-15-2012
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Twisted mainsheet

This is a Beneteau 36s5
As you can see the block is twisted so the line is twisted about 2 full turns.

If I forcibly twist the block until the lines run fair the block wants to twist back up.

The problem is not seem to be that it is reaved improperly. It is just that the line seems to have taken a set.

I have seen this on may boats and just now gotten around to asking about it. It seems to increase the friction in the system and seems to be a bad thing.
Is there anything that can be done to fix this?
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Old 04-15-2012
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Re: Twisted mainsheet

Can you untie the line and swap it end for end so it runs on a different section..?
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Old 04-15-2012
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Re: Twisted mainsheet

On a boat with a similar problem I discovered a set screw on the block which stopped it from swiveling, took the twist out of the line and problem has stopped.
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Old 04-15-2012
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Re: Twisted mainsheet

It is the twists you impart when putting turns on the winch. [ Think about it ]

Un reeve the sheet remove twists put in two or three in the opposite direction. Rereeve the sheet.

I have the same problem.
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Old 04-15-2012
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Re: Twisted mainsheet

Many blocks have little 'lock plates' to help resist turning/swiveling that can be used or removed as your needs dictate.
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Old 04-15-2012
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Re: Twisted mainsheet

To my eye, it looks like the way it is tied. The knot for the thing allows it to twist. Where as if you had a single block with a becket, so the becket held the knotted end, the block would probably not twist like it does. As the becket would make sure the like is going in a straight line, where as with the lined tied to the loop holding the sheave tot he boom, things get an incorrect pull, or should I say, pulls from multiple angles, and things twist accordingly.

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Old 04-15-2012
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Re: Twisted mainsheet

to me- Disconnect from lower block from traveler, rotate block end over end counter closewise, reattach.
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Old 04-15-2012
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Re: Twisted mainsheet

Unshackle and move the boom end of the sheet to the front pad eye to eliminate the interference with the aft block.

Make sure the aft block is free to swivel.

Then get back to us.
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Re: Twisted mainsheet

David,

I think Marty has pinpointed the problem. Attaching the loop to the boom like that is preventing the block to align properly with the pull. I agree with his becket suggestion.

In the meantime, I might try moving the loop end to the forward bail...behind the forward block. That should alow the aft block to swivel free.

I'm going to look for some photos in the meantime.

oops..sloopy beat me to it!
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Old 04-15-2012
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Re: Twisted mainsheet

Another possible solution is to replace the two separate blocks on the boom with one fiddle block like this: Schaefer 7 Series Fiddle Block With Becket
Single and double blocks especially can get a bit gnarly and twisted but the fiddle block (w/2 sheaves & becket) can help ease the twisting effect.
Our main sheet has two fiddle blocks (1 on traveler and 1 on boom) and twisting is never an issue. End boom sheeting may also help us.

Or just get some blocks that don't swivel at that point.
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