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How is this not a recipe for disaster, especially with a slack cable( load sharing, remember) What keeps the cable from grabbing fabric inside the luff pocket and starting a premature furl in the middle of the sail? What does that do to the unfurl? The cable spins inside the luff pocket as the sail unfurls and furls. The cable is attached to the top down furler and the tack is attached to the swivel on the furler. Talking to a North guy, the cable is internal to the luff, the head is strapped to the cable at the top. On Asyms the cable is external to the sail and the sail wraps around the cable. My other question is, how does top down furling on a code zero work. And I would guess that a made to order cable from Future Fibers would be expensive. One of the selling points of cableless technology was that it didn't need an expensive anti torsion cable. Seems to me that putting an anti torsion cable in a cableless sail is a step back. I would guess that 75% of the zeros built in 2020 will be cable-less. I have not sailed with one myself but spend a bit of time worrying about such things and believe it is the way forward. The cable-less sails have proven to furl just fine.
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The biggest concern was in the furl as we had all gone with top/down systems for IRC masthead zeros because of all that garbage high luff to achieve 75% mid-girth. The shape and benefits of a positive luff profile was always going to be good. Given his past and current customer base I am happy to listen to him. One sailmaker I know who was seriously questioning it as a gimmick has fully drank the punch and loves them. Tons of development has gone into cable-less sails including North's Helix, Doyle and Quantum. There is no lack of backstay/forestay tension in that boat especially in 5-8 knots of breeze. North logo on the front so it would have been an original sail to the boat. The Berckemeyer 45 shown above has this type of Code Zero.That was a "standard" code zero with cable in the luff pocket and not a cable-less sail. Even though this sail is smaller than a Code Zero on a race boat, it is more than twice the size of the non-overlapping jib and gives much more power for close reaching. With a straight luff, the sail rolls up very well. This sail is closer in shape to a traditional drifter than a spinnaker. It has a nearly straight luff, a mid girth about 60-65% of the sail's foot length. The sail is very flat and is designed for close reaching.
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The Code Zero for these boats can be used as soon as the the boat bears off from a beat. Many modern cruising boats come with large mainsails and non-overlapping jibs because that sail-plan is easier for couples to handle.
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UK Sailmakers offers two different Cruising Code sails depending on whether your boat has an overlapping genoa or a non-overlapping genoa. When not constrained by rating rules, cruising sailors have a lot more options on the size and shape of a "code" sail. The Code Zero got around the rule by measuring in as a very narrow-flat spinnaker with shape similar to a reaching geona. Code Zero was initially an attempt to circumvent a rating rule by making a large genoa for close reaching on boats that were measured with non-overlapping genaos. The Code Zero is a cross between a genoa and an asymmetrical spinnaker that is used for sailing close to the wind in light air.