Hi,
Full disclosure: I'm a sailmaker, representing Hyde Sails in the USA.
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Notes on the Hunter 260 Water Ballast, with B& R rig.
The Hunter 260 has no backstay and it has spreaders that are very swept aft. The mast should be tuned with a rake of 4-6 degrees, and considerable bend in it. The rake and bend stabilize the mast even though it has no backstay.
So the angle formed by the boom and the mast should be around 84-86 degrees, not 90. Getting the curve of the luff is very important too, so the sail has the right amount curve in the luff to match the mast bend.
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Droopy Boom Syndrome
https://drive.google.com/open?id=0B3-G5RQ08N8BN0dKYzZJZnM4aUU
The leech of a sail usually doesn't stretch appreciably, but what DOES happen is that the bolt rope inside the luff may shrink with age. Modern, high quality mainsails don't have the shrinking bolt rope problem as much, but older ones or ones using soft dacron ropes shrink. Modern, high quality mainsails use a "hard" boltrope that neither shrinks nor stretches very much
After the bolt rope shrinks, the head of the sail cannot be hoisted up to the top of the mast. The leech is still the same length as when manufactured, so the mainsail hangs lower than it should at the back end of the boom. That's what the owner is probably seeing.
There's another thing that happens when the bolt rope shrinks: The sail gets very baggy along the luff and the draft gets very deep. The boat heels more and won't point and the sail is very hard to trim well.
There's a way to "fix" the drooping boom so the head of the sail can go up to the top of the mast. Most quality sails with a soft dacron rope have a "tail" hanging out at the bottom, which is stitched to the sail at the lower end of the luff. If you release the stitches, slide the luff down over the extra rope, and then restitch it, it may solve your droopy boom problem.
But.... and there is a but.... most of the sails with shrunken bolt ropes these days are either really old and stretched out or they are made to a low price point with OEM grade, stretchy sailcloth. Releasing the bolt rope makes the mainsail useable, but most of the time the shape is pretty baggy due to the age and condition of the sailcloth. Releasing the bolt rope in the luff might make an un-usable sail usable, but it probably won't give it a like-new shape.
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