Main backwinding while using 150% - SailNet Community

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Old 08-07-2008
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Main backwinding while using 150%

When I use my #1 obviously it has a bit of overlap, but the weird part is that it looks like its throwing wind on the lee side of the mainsail. This completely dissrupts the main and the only way to fix it has been trimming in the main and moving the traveler all the way to winward. My traveler is over 4.5' long so that gives you an idea of how much adjustment I have to make.

I know this opens the slot quite a bit and would like to know if there is a better way to keep the main in trim and still keep up my speed. I tried rigging a cuningham but it didn't seem to do much. I've just never seen a traveler over that far to windward before.
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Old 08-07-2008
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If 'throwing wind on the lee side of mainsail' means there is an actual pocket pushed into the mainsail aft of the luff:

Try loosening the leech on the genny, there should be a leech cord to adjust it's 'cup' or adjusting the foot back further on the track.

When you say trimming in the main am I to assume you mean over trimming, i.e. the luff is backed and that the tell tales are no longer streaming aft on both sides of the mains leech.
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Old 08-07-2008
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It is supposed to direct wind across the back of your main, that is faster.

First if you are close hauled then you should expect that the main will be soft along the front 1/4 maybe. If it is excessive then have you outhauled to the max, tighten your Cunningham and applied backstay to bend your mast to flatten out your sail some and reduce this affect.

Also your main may simply be too full or stretched out. Is it Dacron ? or as has already been suggested your headsail leech may be stretched out and the leech cord may be tight enough to cause a hook in your leech. Very common on older sails.

Come look at mine.
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Old 08-07-2008
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I think there is a 'cup' on the genny, but even with the leech line free it doesn't seem to flatten out. Here's a couple pics. The draft lines really help to show the shape. And yes, this is on a close hauled course.

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Old 08-07-2008
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Note: this is also with the lead car at the very front of the track.
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Old 08-07-2008
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A certain amount of speed bubble is still fast. On close haul you should have your traveller all the way to windward to point and make best speed, especially with a masthead foresail.
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Old 08-07-2008
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It could also be the fairlead for the genny is in the wrong position. Too far forward, and the leech would be too tight.

BTW, if your genoa fairlead car is all the way forward, it is very likely too far forward.
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The first photo shows you're pulling downward too much on the genoa creating that cup while the foot is slack. Lead your sheet further aft to achieve a more horizontal strain.
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Old 08-07-2008
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Try setting the fairlead car at mid track and adjusting from there a little at a time and see what happens. Done this on a couple of boats to figure out how to trim that particular boat.
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horizontal strain and inducing more twist in the sail? I'll try that. Thanks.
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