Join Date: Apr 2006
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kindsail, remember that to some extent each boat is a custom rig that needs custom balancing. Even "genuine exact" sails all stretch, so if you have a 150 genoa, after two years it may stretch into a 152. Or the loft may have built it as a 146, so it wouldn't exceed 150 after a year or two of use. Same thing with the main, the dimensions change, and as they all change the sail balance will change.
And that's assuming nothing else was changed, big assumption. It may not just be the rake or bend, remember also the mast may need to be moved fore/aft a bit, if you can find out the original factory location, and assuming again they were all built very precisely, that may have been shifted "one hole" or two as well.
Of course once you take the time to go round and round and get the rig really tuned and balanced right, it will usually sail sweeter, point better, pay off your work in spades. If the builder is still around or if there is a class association, see if they have any info for you to start from. Sometimes you'll also pick up bits like "well we built them all with 24" spreaders but they point better if you take them down to 22.5" and you'd never know without asking around.