Clew definition
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When on a reach, the windward leech of a spinnaker (symmetrical or not) is called the luff and, when on a reach or close-hauled, the windward leech of a square sail may be called the luff or the weather leech. Luff – The forward (leading) edge of a fore-and-aft sail is called the luff, and may be attached along a mast or a stay.
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However, once a symmetrical sail has wind blowing along its surface, whether on a reach or close-hauled, the windward leech may be called a luff (see below). The leech is either side edge of a symmetrical sail-triangular or square. Leech – The aft (back) edge of a fore-and-aft sail is called the leech (also spelled leach).For a triangular sail the head refers to the topmost corner. Head – The head is the upper edge of the sail, and is attached at the throat and peak to a gaff, yard, or sprit.The top of all sails is called the head, the leading edge is called the luff, the trailing edge is the leech, and the bottom edge is the foot. In use, the sail becomes a curved shape, adding the dimension of depth or draft. The edges may be curved, either to extend the sail's shape as an airfoil or to define its shape in use. The shape of a sail is defined by its edges and corners in the plane of the sail, laid out on a flat surface.
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Square sail edges and corners (top), running rigging (bottom)