A sailing yacht (US ship prefixes SY or S/Y), 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 (10 m) in length and have been judged to have good aesthetic qualities. Sailboats that do not accommodate overnight use or are smaller than 30 feet (9.1 m) are not universally called yachts. Sailing yachts in excess of 130 feet (40 m) 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.
The term yacht originates from the Dutch word jacht (pl. jachten, which means "hunt"), and originally referred to light, fast sailing vessels that the Dutch Republic navy used to pursue pirates and other transgressors around and into the shallow waters of the Low Countries.
The history of pleasure boats begins with rowed craft in Pharaonic Egyptian times. The history of sailing yachts begins in Europe in the beginning of the 1600s with the building of a pleasure vessel for the son of King James I of England. Pleasure vessels acquired the name yacht after the time of Charles II, who spent time exiled in Europe and visited the Netherlands, where a variety of jachten were already well developed as pleasure boats for the elite classes since the beginning of the 17th century. Upon his restoration to the English crown, Charles commissioned a series of royal yachts, which included at least one experimental catamaran. The first recorded yacht race between two vessels occurred in 1661, followed by the first open sailing competition in 1663 in English waters.
Starting in 1739, England found itself in a series of wars—a period that saw a decline in yachting. In Ireland, however, the gentry enjoyed yachting and founded the first yacht club in Cork as the Cork Harbor Water Club in 1720, followed by the Lough Ree Yacht Club in 1770. English yacht racing continued among the English gentry who founded England's oldest yacht club in 1775 to support a fleet at Cumberland. With maritime peace, starting in 1815, came a resurgence of interest in yachting. Boatbuilders, who had been making fast vessels both for smugglers and the government revenue cutters, turned their skills again to yachts.
The fast yachts of the early 19th century were typically luggers, schooners, or sloops with fore-and-aft rigs. By the 1850s, yachts featured large sail areas, a narrow beam, and a deeper draft than was customary until then. Racing between yachts owned by wealthy patrons was common, with large wagers at stake. The America's Cup arose out of a contest between the yacht, America, and its English competitors. Both countries had rules by which to rate yachts, the English by tonnage and the American by length.
English and American design philosophies for sailing yachts diverged in the early 1800s: the English favoring a narrow beam (width) and a deep-draft keel and the Americans favoring a broad beam and a shallow draft with a moveable centerboard to provide lateral resistance and righting moment. In 1851, when the yacht America crossed to England, the two design philosophies were converging back towards each other. America's pointed, convex bow and maximum beam, placed aft, influenced British designs, thanks to her racing successes against the British competition. American yachtsmen, in turn, found that their shallow "skimming-dish" designs were not faster or safer than the visiting English yachts.
By the turn of the 20th century, racing yachts featured long overhangs, fore and aft, and a narrow, deep keel by historic standards. Along the way, yacht designers discovered that handicapping rules based on tonnage or length were not good indicators of performance, although they remained a basis for taxation in the two home countries.
The prevalent purpose of yachting under sail in the 19th century was racing. Boats would cross the Atlantic to engage the yachts of other owners in contests of speed. Cruising was the provenance of the most wealthy in large, luxurious yachts that had reliable auxiliary power or were solely steam-powered yachts.
Early explorers in smaller sailing craft wrote of their experiences cruising the lakes and canals of Europe in a sailing canoe (John MacGregor) and the near-shore waters of England and Scotland in a 20-foot (6.1 m) cutter (R.T. McMullen). In the late 1800s some cruising adventurers converted fishing vessels and pilot boats into cruising boats. The most notable of these was Joshua Slocum's Spray, a converted work boat in which he accomplished the first single-handed circumnavigation (1895-98).
In the 20th century, cruising yacht design evolved past the handicapping rules-based designs of the 19th century towards more sea-kindly hull designs. In the 1930s yacht hulls were designed with a "fisherman" underbody, whereby the slope of the bow continued to the fullest extent of the draft and then carried horizontally aft. Noted yacht designers, such as John Alden and Starling Burgess employed this configuration. Starting in the 1920s several new rating rules were devised by the Cruising Club of America and the Royal Ocean Racing Club in order to handicap yachts of different designs that were expected to compete against one another. Successful designers of this era were Olin Stephens, Philip Rhodes, Aage Nielson, and C. Raymond Hunt. The International Offshore Racing (IOR) rule supplanted the previous rules in 1970 to provide a fairer basis for handicapping racing yachts. This rule promoted the use of fin keels and blade rudders. This rule was augmented with the International Measurement System (IMS) to assure safe designs for extreme conditions, following the disastrous 1979 Fastnet Race in which only 86 of the 303 participants finished owing to failed equipment and loss of 19 lives and five boats.
Cruising yachts may be designed for near-shore use or for passage-making. They may also be raced, but they are designed and built with the comfort and amenities necessary for overnight voyages. Qualities considered in cruising yachts include: performance, comfort under way, ease of handling, stability, living comfort, durability, ease of maintenance, and affordability of ownership.
Cruising sailboats share the common attribute of providing overnight accommodations. They may be classified as small (easy to haul behind a trailer), near-shore and off-shore. Multihull sailing yachts are a category, apart.
Design considerations for a cruising yacht include seaworthiness, performance, sea kindliness, and cost of construction, as follows:
The displacement of a monohull cruising sailboat affects the above factors, as follows:
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. 
Traditionally, all sailing yachts were made of wood, using a wooden keel and ribs, clad with planks. These materials were supplanted with metal in specialty racing yachts. In the 1960s fiberglass became a prevalent material. These materials and other composites continue in use.
Gaff rigs have been uncommon in the construction of cruising boats, since the mid 20th century. More common rigs are Bermuda, fractional, cutter, and ketch. Occasionally employed rigs since then have been the yawl, schooner, wishbone, catboat. A survey of cruising sailors identified preferences for sloops, cutters, and ketches in equal measure.
Most cruising yachts have masts of aluminum, which may be stepped (mounted) on the top of the keel inside the boat or on the top of the cabin, outside. A keel-stepped mast is better able to withstand a failure of its support ing standing rigging, but requires a penetration of the cabin roof and the need for waterproofing. Masts have a variety of possible tracks for the mainsail to be attached and raised. Some allow for in-mast furling of the mainsail at the expense of aerodynamic efficiency of the mast and sail. Some booms allow for roller furling of mainsails.
Sailboats employ standing rigging to support the rig, running rigging to raise and adjust sails, cleats to secure lines, winches to work the sheets, and more than one anchor to secure the boat in harbor. A cruising yacht's deck usually has safety line to protect the crew from falling overboard and a bow pulpit to facilitate handling the jib and the anchor. In temperate climates, the cockpit may have a canvas windshield with see-through panels, called a "dodger". Steering may be either by tiller or wheel.
Depending on size, a cruising yacht is likely to have at least two cabins, a main salon and a forward stateroom. In smaller yachts, the salon is likely to have convertible berths for its crew or passengers. Typically the salon includes a dining area, which may have a folding, built-in table. The salon is typically contiguous to the galley. A cruising yacht is likely to have a head (bathroom) with a marine toilet that discharges waste into a holding tank. Larger yachts may have additional staterooms and heads. There is typically a navigation station that allows the laying out of charts away from other activities within the vessel. The electrical panel and auxiliary instrumentation is often near this location.
Cruising yachts have an auxiliary propulsion power unit to supplement the use of sails. Such power is inboard on the vessel and diesel, except for the smallest cruising boats, which may have an outboard gasoline motor. Target shaft horsepower for the engine per unit of displacement is related to hull speed per square root of waterline length all to the third power. Choice of engines is also a function of target propeller speed at cruise. A 31-foot (9.4 m) sailboat might have a 13-horsepower (9.7 kW) engine, whereas a 55-foot (17 m) sailboat might have a 110-horsepower (82 kW) engine.
Electrical power comes from a bank of batteries that are recharged by the motor, driving an alternator. The plumbing system for house water draws from one or more tanks, which are either filled in port or replenished with a desalination water maker, driven by the engine. Typically water from kitchen and bathroom sinks and showers drains overboard. Toilets typically use salt water and drain into holding tanks, unless they are in use beyond prescribed distances from shore. Refrigeration may be from ice acquired ashore, or by mechanical refrigeration driven directly from the engine or the yacht's electrical system. Yachts have electrical lighting for inside and outside use and also for night-time running.
Modern yachts employ a suite of electronics for communication, measurement of surroundings, and navigation.
Hull design can affect the aesthetics of a sailing yacht. The shape of the bow and stern are significant factors, as is a yacht's sheer line (the curvature of its deck). Bow shapes include the bow (convex curve), destroyer or vertical (near vertical), and knuckle or raked (angled straight to the water line). Stern shapes include raked aft or counter (slight outward angle), straight (up and down), reverse angle (sloping downward from the deck). As to sheer, traditional yachts have the deck follow a curve below an imaginary straight line from stem (top of bow) to stern.
Racing yachts emphasize performance over comfort. High-performance rigs provide aerodynamic efficiency and hydrodynamically efficient hulls minimize drag through the water and sideways drift.
Racing yachts have a wide selection of weights and shapes of sail to accommodate different wind strengths and points of sail. A suite of sails on a racing yachts would include several weights of jib and spinnaker, plus a specialized storm jib and trysail (in place of the mainsail). Performance yachts are likely to have full-battened kevlar or carbon-fiber mainsails.
Underwater foils can become more specialized, starting with a higher-aspect ratio fin keel with hydrodynamically efficient bulbs for ballast. On some racing yachts, a canting keel shifts angle from side to side to promote sailing with less heeling angle (sideways tilt), while other underwater foils mitigate leeway (sideways motion).
World Sailing recognizes eleven classes of racing yacht:
|Farr 30||30.9 feet (9.4 m)||Various|
|X-35||34.0 feet (10.36 m)||X-Yachts|
|J/111||36.4 feet (11.1 m)||J/Boats|
|Class 40||39 feet (11.9 m)||Open|
|Soto 40||40 feet (12.3 m)||M Boats|
|X-41||40.5 feet (12.3 m)||X-Yachts|
|Swan 45||45.4 feet (13.83 m)||Nautor|
|Transpac 52||52.0 feet (15.85 m)||Open|
|IMOCA 60||60 feet (18 m)||Open|
|Swan 60||61.8 feet (18.85 m)||Nautor|
|Maxi yacht||70 feet (21 m)+||Open|
any of various recreational watercraft: such as a) a sailboat used for racing b) a large usually motor-driven craft used for pleasure cruising
a boat with sails and sometimes an engine, used for either racing or traveling on for pleasure
a large boat with sails or a motor, used for racing or pleasure trips
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