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.
Incat Tasmania is an Australian manufacturer of high-speed craft (HSC) catamaran ferries. Its greatest success has been with large, sea going passenger and vehicle ferries, but it has also built military transports and since 2015 it has built smaller river and bay ferries. Based in Derwent Park, a suburb of Hobart, Tasmania, Australia, it was founded by Bob Clifford.
TT-Line Company Pty Ltd, better known by its trading name Spirit of Tasmania is a company which has been operating ferries from mainland Australia to Tasmania since July 1985. The company was separated from the Tasmanian Government's Department of Transport in 1993, becoming a government business enterprise wholly owned by the Government of Tasmania where it was then named Spirit of Tasmania in August 1993.
A wave-piercing boat hull has a very fine bow, with reduced buoyancy in the forward portions. When a wave is encountered, the lack of buoyancy means the hull pierces through the water rather than riding over the top, resulting in a smoother ride than traditional designs, and in diminished mechanical stress on the vessel. It also reduces a boat's wave-making resistance.
A high-speed craft (HSC) is a high-speed water vessel for civilian use, also called a fastcraft or fast ferry. The first high-speed craft were often hydrofoils or hovercraft, but in the 1990s catamaran and monohull designs become more popular. Most high-speed craft serve as passenger ferries, but the largest catamarans and monohulls also carry cars, buses, large trucks and freight.
Fred. Olsen Express is an inter-island ferry service based in the Canary Islands, Spain. It operates a fleet of six modern fast ferries on five routes. Its fleet includes a trimaran fast ferry, the Benchijigua Express, which was the first such vehicle in the world when it entered service in 2005. The company is owned by the Olsen family-controlled Bonheur and Ganger Rolf, which among other things also owns the shipping companies Fred. Olsen Cruise Lines and First Olsen Tankers.
Robert "Bob" Frederick Clifford AO,, and now living in Surrey, England, is an Australian shipbuilder, entrepreneur, and businessman, best known for his success in building his Incat catamaran building company into an international brand that sells wave piercing catamaran ferries all over the world including to the US military and many European ferry operators.
Austal Limited is an Australian-based global ship building company and defence prime contractor that specialises in the design, construction and support of defence and commercial vessels. Austal's product range includes naval vessels, high-speed ferries, and supply or crew transfer vessels for offshore windfarms and oil and gas platforms.
Lock Crowther was an Australian multihull sailboat designer. He grew up in Bairnsdale in the East Gippsland region of Victoria. Though his first name was Lachlan by birth, he insisted on being called Lock or Lockie.
Captain Cook Cruises is an Australian cruise operator. As of January 2018, the company operated 21 vessels on Sydney Harbour, providing a range of Government contracted and non-contracted Ferry services, Sightseeing, Dining and Charter Cruises.
Baltic Workboats AS is an Estonian shipbuilding company with shipyards in Nasva, Estonia and Tampa, Florida, the United States. Baltic Workboats has built more than 200 different sized boats and vessels for pilots, coast guards, police, fishery inspections, research institutes and several harbors.
Richardson Devine Marine is an Australian company, situated in Tasmania on Hobart's Derwent River.
Philip Christian Hercus AO BSc was a naval architect and marine vessel designer in Sydney Australia.
Gladding-Hearn Shipbuilding is a shipyard located in Somerset, Massachusetts on the Taunton River. It primarily builds pilot boats and high-speed catamaran ferries.
The BSC Marine Group is a shipbuilding company based in Brisbane, Queensland, Australia. Founded in 1994, it specialises in the design and construction of aluminium and composite vessels. Headquartered in Toowong in Queensland, Australia, its shipyard is at Hemmant.
Josefa Slipways, Inc. is a medium-category shipbuilding company based in Navotas, Philippines. It was established in 2005 to provide shipbuilding and ship repair services to shipping companies and maritime government agencies in the Philippines. The company has two slipways in Navotas for docking and launching vessels as well as another facility in Sual, Pangasinan.
