Because the luff wire does not have the torsional stiffness of the extrusion, Code Zero luff systems are not generally used as reefing systems. These furlers differ from the older prior-art furlers in that they do not use luff extrusions, but rather use a luff wire, sewn into the luff of the sail in place of the extrusion. 1 shows a typical prior art Code Zero Furler. These sails fill a niche between the Genoa jib and spinnaker, and have become popular with cruising sailors as well as racers.Ĭode zero sails generally contain their own furling systems, known as Code Zero Furlers, since Code Zero sails may be repeatedly set and struck during a single sail or race. The code zero is a free-flying sail, useful at apparent wind angles of between 40 and 65 degrees APP (apparent wind angle). Recent innovations in sail design have included the so-called “Code Zero” asymmetric headsail. At the top of the extrusion the swivel 24 allows the luff wire or rope to rotate with respect to the halyard 12, which is directed through the masthead 88, and then back toward the deck of the boat. The drum 26 rotatably attaches the bottom of the extrusion to the bow 30 of the boat. The tabling of the luff 16 of the jib l 4 is sewn around and seized to the luff rope 1. This prior art embodiment may be seen in FIG. The most common of these furling systems involves three basic components: (1) a luff extrusion, which runs along the forestay of the boat, and which holds the luff of the sail (2) a drum or wheel mounted on the bow of the sailboat, used to “wind up” the sail about the extrusion and (3) a swivel bearing mount which can slide along the top of the extrusion, and which allows the halyard to hold the sail up while permitting the extrusion to rotate at its top end relative to the forestay. Furling systems for the jibs and other headsails of sailboats are well known and widely used.
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