A multihull is a boat or ship with more than one hull, whereas a vessel with a single hull is a monohull. The most common multihulls are catamarans, and trimarans. There are other types, with four or more hulls, but such examples are very rare and tend to be specialised for particular functions.
A catamaran is a watercraft with two parallel hulls of equal size. The distance between a catamaran's hulls imparts resistance to rolling and overturning. Catamarans typically have less hull volume, smaller displacement, and shallower draft (draught) than monohulls of comparable length. The two hulls combined also often have a smaller hydrodynamic resistance than comparable monohulls, requiring less propulsive power from either sails or motors. The catamaran's wider stance on the water can reduce both heeling and wave-induced motion, as compared with a monohull, and can give reduced wakes.
A trimaran is a multihull boat that comprises a main hull and two smaller outrigger hulls which are attached to the main hull with lateral beams. Most modern trimarans are sailing yachts designed for recreation or racing; others are ferries or warships. They originated from the traditional double-outrigger hulls of the Austronesian cultures of Maritime Southeast Asia; particularly in the Philippines and Eastern Indonesia, where it remains the dominant hull design of traditional fishing boats. Double-outriggers are derived from the older catamaran and single-outrigger boat designs.
An outrigger is a projecting structure on a boat, with specific meaning depending on types of vessel. Outriggers may also refer to legs on a wheeled vehicle that are folded out when it needs stabilization, for example on a crane that lifts heavy loads.
Outrigger boats are various watercraft featuring one or more lateral support floats known as outriggers, which are fastened to one or both sides of the main hull. They can range from small dugout canoes to large plank-built vessels. Outrigger boats can also vary in their configuration, from the ancestral double-hull configuration (catamarans), to single-outrigger vessels prevalent in the Pacific Islands and Madagascar, to the double-outrigger vessels (trimarans) prevalent in Island Southeast Asia. They are traditionally fitted with Austronesian sails, like the crab claw sails and tanja sails, but in modern times are often fitted with petrol engines.
Proas are various types of multi-hull outrigger sailboats of the Austronesian peoples. The terms were used for native Austronesian ships in European records during the Colonial era indiscriminately, and thus can confusingly refer to the double-ended single-outrigger boats of Oceania, the double-outrigger boats of Island Southeast Asia, and sometimes ships with no outriggers or sails at all.
Waka are Māori watercraft, usually canoes ranging in size from small, unornamented canoes used for fishing and river travel to large, decorated war canoes up to 40 metres (130 ft) long.
A tepukei, tepuke or TePuke is a Polynesian boat type, characterized by its elaborate decking, its submerged hulls and symmetrical "crab claw" sail slender foil or radically extended tips claw sail. Tepukei boats are produced primarily by the Polynesian-speaking inhabitants of Taumako, and have been occasionally borrowed by other Polynesian and Melanesian societies.
Canoe sailing refers to the practice of fitting an Austronesian outrigger or Western canoe with sails.
The crab claw sail is a fore-and-aft triangular sail with spars along upper and lower edges. The crab claw sail was first developed by the Austronesian peoples by at least 2000 BCE. It is used in many traditional Austronesian cultures in Island Southeast Asia, Micronesia, Island Melanesia, Polynesia, and Madagascar. It is sometimes known as the Oceanic lateen or the Oceanic sprit, even though it is not restricted to Oceania, is neither a lateen sail nor a spritsail, and has an independent older origin.
Drua, also known as na drua, n'drua, ndrua or waqa tabu, is a double-hull sailing boat that originated in the south-western Pacific islands. Druas do not tack but rather shunt. Both ends of each hull are identical, but the hulls are of different sizes and the smaller one is always sailed to windward. The main differences, compared to proas, are that the hulls have a symmetric U-form profile, and a second hull is used instead of an outrigger. When a float (cama) is used in place of the smaller hull, the craft is called a camakau.
The Fijian double canoe was the largest and finest sea-going vessel ever designed and built by natives of Oceania before contact with Europeans.
Vaʻa is a word in Samoan, Hawaiian and Tahitian which means 'boat', 'canoe' or 'ship'. A larger traditional seagoing vessel for long-distance voyages is referred to as vaʻa tele. The term alia is also used for larger vessels in Samoa. The smaller vaʻa used for fishing typically have a float, or outrigger, attached to the main hull for stability. This outrigger part of the canoe is called ama in various Polynesian languages.
Paraw are various double outrigger sail boats in the Philippines. It is a general term and thus can refer to a range of ship types, from small fishing canoes to large merchant lashed-lug plank boats with two outriggers (katig) propelled by sails
Camakau are a traditional watercraft of Fiji. Part of the broader Austronesian tradition, they are similar to catamarans, outrigger canoes, or smaller versions of the drua, but are larger than a takia. These vessels were built primarily for the purposes of travelling between islands and for trade. These canoes are single hulled, with an outrigger and a cama, a float, with both ends of the hull being symmetrical. They were very large, capable of travelling open ocean, and have been recorded as being up to 70 ft in length.
Wa are traditional sailing outrigger canoes of the Caroline Islands, Palau, and Yap. They have a single outrigger. They are similar to the sakman of the Northern Marianas.
Amatasi are a type of Samoan double-hulled watercraft. Its sails were woven pandanus leaves tied to 2 spars. The hull was sometimes built of planks. Lashed together, large double canoes 30–60 feet long could carry 25 men on journeys of hundreds of miles.
Kaep is a traditional type of double-ended Proa sailboat native to Palau. Some of the essential design elements have also been adopted as a modern smaller multihull prototype variant.
Bangka are various native watercraft of the Philippines. It originally referred to small double-outrigger dugout canoes used in rivers and shallow coastal waters, but since the 18th century, it has expanded to include larger lashed-lug ships, with or without outriggers. Though the term used is the same throughout the Philippines, "bangka" can refer to a very diverse range of boats specific to different regions. Bangka was also spelled as banca, panca, or panga in Spanish. It is also known archaically as sakayan.
Sakman, better known in western sources as flying proas, are traditional sailing outrigger boats of the Chamorro people of the Northern Marianas. They are characterized by a single outrigger and a crab claw sail. They are the largest native sailing ships (ladjak) of the Chamorro people. Followed by the slightly smaller lelek and the medium-sized duding. They are similar to other traditional sailing ships of Micronesia, like the wa, baurua, and the walap. These ships were once used for trade and transportation between islands.
Austronesian vessels are the traditional seafaring vessels of the Austronesian peoples of Taiwan, Maritime Southeast Asia, Micronesia, coastal New Guinea, Island Melanesia, Polynesia, and Madagascar. They also include indigenous ethnic minorities in Vietnam, Cambodia, Myanmar, Thailand, Hainan, the Comoros, and the Torres Strait Islands.
