You say your sails are "rather old." If your sails are getting older the draft will have moved aft on both the main and genoa, and your genoa may have begun to develop a "hook" in the leech (if the leech has stretched and you've had to tighten the leech line to stop fluttering, this can make the hook more pronounced). Any of these issues will increase backwinding. Most people will tell you that carrying a "bubble" is fast, but that doesn't mean you should always carry a bubble or that a big bubble is even faster. You want your sails trimmed to maximize lift while minimizing drag. The min/max point may involve a bubble in the main, but go too far and you'll begin increasing drag and slowing down. With the cars fully aft you're opening the leech but you're also closing the foot and lower part of the sail, which is the part that overlaps the main the most. If it's draft-aft then its max draft may be right in the flow of air coming off the genoa. You've replaced your genoa and you might be ready to do the same for your main. BTW: I had the same problem, and I'm just about to write a check for new sails. Lots of discounts available in October. :)
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Andrew Burton Sent: Tuesday, October 08, 2013 8:37 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List How to limit backwinding the main I sheet the boom right on centerline or even a little above. I try to have the top batten parallel with the boom. Having the main fairly flat with the maximum draft about 40% aft helps, too. If the main is too full, you will get more backwind. If the genoa is old and the draft has moved back to the leech, you will get more backwind. But overall a little backwind is to be expected and not really a problem. Andy C&C 40 Peregrine On Tue, Oct 8, 2013 at 9:11 AM, David Knecht <davidakne...@gmail.com<mailto:davidakne...@gmail.com>> wrote: The discussion of C&C 34 in heavy air reminded me of a problem I had on my 34 and similar issue on my 34+. To me that means I am probably doing something wrong with sail trim. I find that my mainsail is almost always backwinded by the genoa. If I leave the traveller on the midline and sheet in the main and jib as I think is correct, a significant percentage of the main is luffing. The only solution I have found is to pull the traveller up 6" to a foot, which does not seem right. I had thought that by moving the genoa tracks aft, I would open the leech more and that twist would minimize backwinding, but that does not seem to help much. Both boats had rather old main sails, so possibly they have just lost their shape. Genoa's are pretty old as well, but a new genoa on my 34 did not change the problem much. So it seems more likely I am setting things up incorrectly. Can the group comment on their extent of backwind and what you do if you want to limit it so you can maximize power. Thanks- Dave David Knecht Aries 1990 C&C 34+ New London, CT [cid:image001.png@01CEC678.CA198B90] _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com<mailto:CnC-List@cnc-list.com> -- Andrew Burton 61 W Narragansett Ave Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ phone +401 965 5260
<<inline: image001.png>>
_______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
