page_title: Sailing yacht
section_title: Design
hierarchical_section_title: Sailing yacht / Cruising / Design
caption_attribution_description: Français&#160;: Dans le Bassin des Chalutiers, lors du salon nautique Bateaux Passion, un catamaran de croisière Lagoon 560. Quelques caractéristiques du Lagoon 560: catamaran de croisière de série, année le lancement de la série: 2010, longueur hors tout: 17,07 mètres, largeur hors tout: 9,44 mètres, tirant d' eau: 1,50 mètres, surface de voile au près: 207 m2, gasoil: 1300 litres, homologué pour 14 personnes. La Rochelle, Charente Maritime, France.
context_page_description: A sailing yacht, is a leisure craft that uses sails as its primary means of propulsion. A yacht may be a sail or power vessel used for pleasure, cruising, or racing. There is no standard definition, so the term applies here to sailing vessels that have a cabin with amenities that accommodate overnight use. To be termed a "yacht", as opposed to a "boat", such a vessel is likely to be at least 33 feet in length and have been judged to have good aesthetic qualities. Sailboats that do not accommodate overnight use or are smaller than 30 feet are not universally called yachts. Sailing yachts in excess of 130 feet are generally considered to be superyachts.
  Sailing yachts are actively used in sport and are among categories recognized by the governing body of sailing sports, World Sailing.
context_section_description: Design considerations for a cruising yacht include seaworthiness, performance, sea kindliness, and cost of construction, as follows:
  Seaworthiness addresses the integrity of the vessel and its ability to stay afloat and shelter its crew in the conditions encountered. Watertightness of connections, ports and hatches are key to staying afloat. Stability—the ability to return to an upright condition when upset by waves is also important.
  Performance hinges on a number of factors, including the waterline length (longer means faster), drag in the water (narrower hull with smooth appendages), hull shape, and sail shape and area.
  Sea kindliness is an indicator of steering ease, directional stability and quelling of motion induced by wind and waves.
  The displacement of a monohull cruising sailboat affects the above factors, as follows:
  Heavy displacement yachts with a displacement to length ratio (D/L) of 400+ have a long, deep keel and a protected propellor. They are stable, often roomy, are resistant to harm from groundings and floating obstacles, and have good sea kindliness, but lack speed.
  Medium displacement yachts with a D/L of about 300 typically have a separate keel and blended rudder support, which improves speed and maneuverability over the heavy displacement designs.
  Light displacement yachts with a D/L of about 200 typically have a fin keel and a spade rudder with a ballasted bulb. They have good speed, maneuverability, and ability to point into the wind. Their sea kindliness is less than the heavy and medium-displacement categories.
  Multihulls offer tradeoffs as cruising sailboats, compared with monohulls. They may be catamarans or trimarans. They rely on form stability—having separate hulls far apart—for their resistance to capsize. Their advantages include greater: stability, speed, (for catamarans) living space, and shallower draft. Their drawbacks include: greater expenses, greater windage, more difficult tacking under sail, less load capacity, and more maneuvering room required because of their broad beam. They come with a variety of sleeping accommodations and (for catamarans) bridge-deck configurations.
caption: Cruising catamaran in 2012
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