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In sailing and boating, a vessel's freeboard is the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. In commercial vessels, the latter criterion measured relative to the ship's load line, regardless of deck arrangements, is the mandated and regulated meaning.
Preliminary design of the vessel, its detailed design, construction, trials, operation and maintenance, launching and dry-docking are the main activities involved. Ship design calculations are also required for ships being modified (by means of conversion, rebuilding, modernization, or repair).
A small waterplane area twin hull, better known by the acronym SWATH, is a catamaran design that minimizes hull cross section area at the sea's surface. Minimizing the ship's volume near the surface area of the sea, where wave energy is located, minimizes a vessel's response to sea state, even in high seas and at high speeds.
The Friendship sloop, also known as a Muscongus Bay sloop or lobster sloop, is a gaff-rigged working boat design that originated in Friendship, Maine around 1880 and has survived as a traditional-style sailboat.
Ship stability is an area of naval architecture and ship design that deals with how a ship behaves at sea, both in still water and in waves, whether intact or damaged. Stability calculations focus on centers of gravity, centers of buoyancy, the metacenters of vessels, and on how these interact.
A carrack ( Portuguese: nau; Spanish: nao; Catalan: carraca; Croatian: karaka) is a three- or four- masted ocean-going sailing ship that was developed in the 14th to 15th centuries in Europe, most notably in Portugal and Spain.
Ancient boat building methods can be categorized as one of hide, log, sewn, lashed-plank, clinker (and reverse-clinker), shell-first, and frame-first. While the frame-first technique dominates the modern ship construction industry, the ancients relied primarily on the other techniques to build their watercraft.
Freedom Ship is a floating city project initially proposed in the late 1990s. The namesake of the project reflects the designer's vision of a mobile ocean colony, such that it is free from the property, municipal, or federal laws of any nation states.
Boat building is the design and construction of boats (instead of the larger ships) — and their on-board systems. This includes at minimum the construction of a hull, with any necessary propulsion, mechanical, navigation, safety and other service systems as the craft requires.
The boats of the 1960s and 1970s were substantially extensions of classic hull designs which evolved in wood and were influenced by the early rules of racing. There was an emphasis on shorter waterlines at rest that would expand dramatically when the boat heeled (leaned).