Join Date: Nov 2007
Location: SF Bay area
Thanked 7 Times in 6 Posts
Rep Power: 10
Re: Twisted Main sheet.
My guess would be that the line is being twisted elsewhere and the twists are working their way back to the tackle. If you twist a line and fold it back into a bight, the bight will always try to take out the twists by twisting around itself.
Looking down from above, the bight has some right-handed twists, so you need to add some left-handed twists to the line itself to cancel them out. I would start at the traveler and work my way up, adding left-handed twists. You should see the block on the boom flip over.
Actually it might be easier to just unreeve the sheet, shake out the twists, and reeve it back in. Make sure that you don't add any twists in this process, of course.
Once you've removed the twists in the line, you need to figure out they got there. If you're putting your sheet on a winch, every wrap on the winch adds a twist, so make sure you shake out the line after taking it off the winch.
When you coil your sheet at the end of the day, make sure you use a figure-eight coil rather than helical coils, as the latter add a twist with each wrap of the coil. Alternately, you can do a standard coil with alternating twists, which will cancel each other out; I find the figure-eight easier to do. To do the figure-eight coil, I just pass a length of rope from my right hand to my left, where the coils are collected, without turning either hand.
s/v Laelia - 1978 Pearson 365 ketch