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A sailing yacht can vary in overall length (Length Over All - LOA, in yachting parlance) from about 6 m (20 feet) to well over 30 m (98 ft), where the distinction between a yacht and a ship become blurred. However, most privately owned yachts fall in the range of about 7 m to 14 m (about 23-46 ft); the cost of building and keeping a yacht rises quickly as length increases. In the US sailors tend to refer to smaller yachts as sailboats, while referring to the general sport of sailing as yachting.
Monohull yachts are typically fitted with a fixed or adjustable keel below the waterline to counterbalance the overturning force of wind on the vessel's sails. By contrast, multihull yachts (a catamaran is an example of this type of vessel) use two or more hulls widely separated from each other to provide a stable base that resists overturning.
Until the 1950s almost all yachts were made of wooden boards, or in a larger yacht, steel but nowadays there is a much wider range of materials. Most common is fibreglass, but steel, aluminium and much less often because of insurance difficulties, ferrocement are used as well. Wood is still used (traditional board based methods as well as modern technologies based on plywood, veneers and epoxy-glues etc.) but wood is mostly used when building an individual boat by a hobbyist or wooden boat purist. At the other extreme, high performance yachts such as those used in the Volvo Ocean Race and the America's Cup are often constructed from carbon fibre.
Modern yachts have efficient sail-plans that allow them to sail into the wind. This capability is the result of a sail plan and hull design (typically a sloop rig) that utilizes Bernoulli's principle to generate lift.
Classification of sailing yachts Sailing yachts fall into four basic categories: 'Day Sailing', 'Weekender', 'Cruiser' and 'Racer'.
Day Sailing yachts Day Sailing yachts are small sub-6 metre (20 foot) vessels. Sometimes called dinghies, they often have a retractable keel, centerboard, or daggerboard. Day sailing yachts do not have a cabin as they are designed for hourly or daily use and not for ovenight journeys.
Weekender yachts Weekender yachts are small, sub-9.5 metre (30 foot) vessels. They often have twin-keels or lifting keels. This allows them to operate in shallow waters, and if needed 'dry out' – become beached as the tide falls, the hull shape (or twin-keel layout) allows the boat to sit upright when there is no water. Such boats are designed to undertake short journeys, rarely lasting more than 2 to 3 days (hence their name). Of course, in coastal areas long trips may be undertaken in a series of short hops. Weekenders usually only have a simple cabin, often consisting of a single 'saloon', with bedspace for 2-3 people, and clever use of ergonomics to allow both galley (kitchen) space, seating and space for navigation equipment. There is limited space for large stores of water/food. Weekenders tend to be slower vessels due to their small sail area, and due to their small size they can be overwhelmed by heavy seas. Most are single-mast 'Bermudan sloop' rigged vessels, with a single foresail (of the 'jib' or 'genoa') type and a single mainsail. Some are gaff rigged. The smallest of this type--generally called pocket yachts or pocket cruisers can be trailed on special trailers behind vehicles to transport them by road.
Cruiser yachts Cruisers are by the far the most common in private usage, making up most of the 7 m to 14 m (23 to 46 ft) range. These vessels can be quite complex in design, as designers try to find a balance between docile handling qualities, interior space, good light-wind performance and on-board comfort. The huge range of such craft, from dozens of builders worldwide make it hard to give a single illustrative description. However, most favour a teardrop-planform hull, with a wide, flat bottom and deep single-fin keel to give good stability. Most are single-mast 'Bermudan sloop' rigged vessels, with a single fore-sail (of the 'jib' or 'Genoa') type and a single mainsail. Spinnaker sails, with huge areas, are often supplied for lightwind use. These types are often chosen as family vessels, especially those in the 8 to 12 metre (32 to 40 ft) range. Such a vessel will usually have many rooms below deck. Typically there will be 3 double-berth cabins, a single large saloon (galley, seating and navigation area) and a 'head' (toilet/shower-room). The interior will be finished in wood panelling, with plenty of storage space. Cruisers are quite capable of taking on long-range passages of many thousands of miles, so have large freshwater tanks. Such boats have a cruising speed of around 10 km/h. This basic design is typical of the standard types produced by the major yacht-builders. Most large luxury yachts (15m+, 50 feet+) are also cruisers, but their design varies greatly as they are usually 'one off' designs to the specific needs of the buyer.
Racing yachts
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