Re: Boom rise with reefing... How much?
Is this a new sail? I suspect that the reef cringles on the leech were installed a little higher than their corresponding points on the luff. When I had a new mainsail made giving the exact dimensions of the old main, the new came in slightly different such that when installed the boom was no longer pararell to the deck but had a slight rise from the horizonal. Forturnuily the reef points did not cause the boom to rise anymore when the first and second reefs were put in. Not sure as to effects on performance.