> All 4 batters are full and adjustable. This is what I have on Calypso's mainsail plus it is an all conditions weight of a Pentax like cloth. The battens terminate into Harken Batt cars. The sail includes 3 reef points and a flatting reef. This main is not particularly responsive in TWS below 5 knots.
With the adjustable full length battens it has been my experience that in lighter air the battens will mask some of the signs that the sail is out of trim. I use the much of the same trimming methods described by others responding to your question, especially the telltales off the top two battens. I will add that when pinching up below another boat I have brought the boom above center and slightly over trimmed the main to throw a little extra dirty air their way. If I am in a cranky mood I will ask the crew to work up a fart or two so the bad air also stinks. What I have not tested enough is changing the tension of the battens for different wind strengths. When we have Calypso back in sailing condition, improving our light air performance is high on the priority list and the main sail near the top of that list. I expect we will end up with a lighter newer design of mainsail for full on racing and use the current sail for higher wind forecasts and cruising. Martin DeYoung Calypso 1971 C&C 43 Seattle [Description: Description: cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David Knecht via CnC-List Sent: Tuesday, August 11, 2015 6:52 PM To: CnC CnC discussion list Cc: David Knecht Subject: Re: Stus-List Trimming the main All 4 batters are full and adjustable. I am certainly going to have to play more with boom position. I have rarely put the boom right on centerline as it just hasn't felt fast, but I will do some actual comparative measurements. Probably comes from my dinghy experience where it is never on centerline. Usually I have it a few inches (2-6") off center at the rear in everything but heavy air. Dave On Aug 11, 2015, at 6:20 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: David, Is your main a 3 + 1? That is, top full batten and 3 partials below. If so, you should focus on the second, or top partial batten not the top full batten. Upwind, boom on centerline, second batten guideline: Light breeze - slightly hooked to weather. Moderate breeze - parallel to boom. Heavy breeze - twisted off to leeward to reduce heel. Dennis C. Sent from my iPhone On Aug 11, 2015, at 3:23 PM, David Knecht via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: I have read in several places that one guideline for mainsail trim is to make the upper batten parallel with the boom. My upper batten is full length with adjustable tension, so it is curved. In this situation, what part of the batten would theoretically want to be parallel with the boom? Thanks- Dave Aries 1990 C&C 34+ New London, CT <pastedGraphic.tiff>
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