The tension in the luff of a sail is a balance between the ha'lyard, pulling upward, and either a kicking strap or a tackline (or both), pulling downward. The upper forward corner of a four-sided sail is the throat. The forward lower corner of a sail is the tack, the after lower corner is the clew. The top edge of a four sided sail, the head, is usually attached to a gaff or a yard. The bottom, more or less horizontal, edge of the sail is the foot. The forward, more or less vertical, edge of a sail is the luff, the after edge is the leech*. The angle of the sail to the wind is controlled by a sheet (line). N A sheet of flexible material used by a sailing vessel to convert the movement of the wind into motive force to drive the vessel through the water.Ī sail is raised into position by a ha'lyard and (sometimes) brought down by a downhaul.
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