![]() They normally use aluminium foils along the luff with the jib/genoa luff tape running up a groove in the aluminium foil. The traditional jib/genoa furler is a fixed installation on the main structural forestay. This prevents an air bubble being trapped ¾ of the way up the furl, which can sometimes be a problem with bottom up furling of deeper sail shapes. They are still straight luff sails with the cable contained in a luff pocket, but the tack of the sail floats free from the cable and the furl starts at the head of the sail. Some modern racing code zero’s, which are designed deeper, for light airs and deeper angles, are changing to top-down furling. The sail is directly lashed to the top of the torsional cable and so the furl starts at the head and works its way down the length of the cable. The cable transmits the torque from the furling drum along the full length of the cable to the head of the sail. This swivel allows the tack of the sail to remain free-flying while the drum turns the torsional cable. ![]() The tack of the sail is attached using a strop to an independent swivel, either on the top of the drum or mounted between the drum and the cable. The luff of these downwind sails flies free of the torsional cable to allow the luff to project forward. Top down furling has developed in recent years and is “generally” used to furl asymmetric spinnakers and gennakers. The furl makes its way up the luff of the sail. When the drum turns the tack of the sail immediately starts to furl around the cable. The tack of the sail is lashed to the cable thimble which sits in the jaw of the furling drum. This is a straight luff sail used for reaching and light, upwind sailing.Ī torsional cable is encased in a pocket which runs up the luff of the sail. + Top-down vs Bottom-up furling and how are they different from a genoa furlerīottom up furling came first, this is “generally” the method used for furling code zero sails. Each asymmetric sail has its own Top down adapter which lives with the sail in the sail bag when not in use. The benefit is that the same code zero furling drum can be used with multiple sails. However, more and more manufacturers are switching to top-down adapters rather than dedicated top down drums. It often means that cruising sailors get far more use out of their downwind sail inventory compared to traditional spinnakers.įAQ´s: + What is the difference between a Code zero and asymmetric furler?Ī dedicated top-down furler has an independent swivel situated on/above the furling drum which allows the tack of the asymmetric / Gennaker to fly freely whilst the torque of the furling drum is transmitted along the length of the torsional cable. This is where top down furling originated.Īsymmetric sails furling offers the same major handling benefits as code zero furlers. ![]() Due to its instant success and broad appeal people started experimenting with furling gennakers and asymmetric spinnakers in the same way. The main benefits are that they can be deployed and furled very quickly and easily from the cockpit and they can be left in situ when not in use.Ĭode Zero furling, which is a quick and effective way to douse this big sail, is a bottom up furling system. ![]() They are mounted on a torsional furling cable, forward of the main structural forestay. Code Zero sails offer optimal performance at almost any wind angle with superb handling.Ĭode zero sails are basically large, deep genoas, specifically designed for going upwind in light airs and offshore reaching. Code Zero and Asymmetric spinnaker / Gennaker furling systems are widely used by sailing cruisers and racers thanks to their versatility.
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