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Sailmakers recommend membrane sails over traditional woven Dacron for cruising boats, particularly those equipped with in-mast or in-boom furling systems.12:07 Unlike woven fabrics, which suffer from poor bias strength and lose their aerodynamic shape as the draft migrates aft over time, custom-designed membrane sails utilize load-bearing fibers oriented specifically to the sail's stress points.8:26 This construction allows the sail to maintain its designed draft and performance profile even after years of use.10:48 For furling sails, membranes offer a distinct advantage: designers can incorporate additional load-bearing threads that provide structural integrity at every reefing point, effectively creating a new sail shape as the sail is furled.12:15 While membrane sails cost roughly double the price of premium Dacron, they offer superior longevity in terms of performance shape.20:14 Proper sail trim, including consistent use of the Cunningham, outhaul, and mast bend, remains essential to flattening the sail and maintaining efficiency in higher wind speeds before resorting to a reef.6:48

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