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Watercraft
Watercraft
Watercraft
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A dinghy
A 17th-century sailing raft in Paita harbour (Peru).[1]: 198 
A container ship in the Suez Canal

A watercraft or waterborne vessel is any vehicle designed for travel across or through water bodies, such as a boat, ship, hovercraft, submersible or submarine.

Types

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Historically, watercraft have been divided into two main categories.

  • Rafts, which gain their buoyancy from the fastening together of components that are each buoyant in their own right. Generally, a raft is a "flow through" structure, whose users would have difficulty keeping dry as it passes through waves. Consequently, apart from short journeys (such as a river crossing), their use is confined to warmer regions (roughly 40° N to 40° S). Outside this area, use of rafts at sea is impracticable due to the risks of exposure to the crew.
  • Boats and ships, which float by having the submergible part of their structure exclude water with a waterproof surface, so creating a space that contains air, as well as cargo, passengers, crew, etc. In total, this structure weighs less than the water that would occupy the same volume.[2]: 7–8 

Watercraft can be grouped into surface vessels, which include ships, yachts, boats, hydroplanes, wingships, unmanned surface vehicles, sailboards and human-powered craft such as rafts, canoes, kayaks and paddleboards;[3] underwater vessels, which include submarines, submersibles, unmanned underwater vehicles (UUVs), wet subs and diver propulsion vehicles; and amphibious vehicles, which include hovercraft, car boats, amphibious ATVs and seaplanes. Many of these watercraft have a variety of subcategories and are used for different needs and applications.

Design

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Main article: Naval architecture

The design of watercraft requires a tradeoff among internal capacity (tonnage), speed and seaworthiness. Tonnage is important for transport of goods, speed is important for warships and racing vessels, and the degree of seaworthiness varies according to the bodies of water on which a watercraft is used. Regulations apply to larger watercraft, to avoid foundering at sea and other problems. Design technologies include the use of computer modeling and ship model basin testing before construction.[4]

Propulsion

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A Severn-class lifeboat in Poole Harbour, Dorset, England.

Watercraft propulsion can be divided into five categories.

  • Water power is used by drifting with a river current or a tidal stream. An anchor or weight may be lowered to provide enough steerage way to keep in the best part of the current (as in drudging) or paddles or poles might be used to keep position.
  • Human effort is used through a pole pushing against the bottom of shallow water, or paddles or oars operating in the surface of the water.
  • Wind power is used by sails
  • Towing is used, either from the land, such as the bank of a canal, with the motive power provided by draught animals, humans or machinery, or one watercraft may tow another.
  • Mechanical propulsion uses a motor whose power is derived from burning a fuel or stored energy such as batteries. This power is commonly converted into propulsion by propellers or water jets, with paddle wheels being a largely historical method.[2]: 33 

Any one watercraft might use more than one of these methods at different times or in conjunction with each other. For instance, early steamships often set sails to work alongside the engine power. Before steam tugs became common, sailing vessels would back and fill their sails to maintain a good position in a tidal stream while drifting with the tide in or out of a river. In a modern yacht, motor-sailing – travelling under the power of both sails and engine – is a common method of making progress, if only in and out of harbour.[2]: 33–34 [5]: 199–202 [6]

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Watercraft

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from Grokipedia
Watercraft are vehicles designed for on, in, or through bodies of , encompassing a diverse array of vessels from simple rafts and dugout canoes to advanced ships and submersibles. These crafts have been essential to human since prehistoric times, facilitating transportation, , , , recreation, and activities across oceans, rivers, lakes, and other waterways. The history of watercraft dates back over 12,000 years to the post-Ice Age period, when the earliest known forms—log boats or dugout canoes—emerged independently in various regions as basic means of crossing water barriers. By the early (around 2000–1000 BC), more sophisticated plank-built boats appeared, constructed by sewing wooden planks together and caulking them with materials like or for improved seaworthiness and capacity. Over millennia, innovations in materials (from wood to metal and composites), propulsion (paddles, sails, oars, engines, and jets), and design have transformed watercraft into highly specialized tools, enabling global maritime trade that now accounts for approximately 90% of international goods movement. Watercraft are classified by factors such as size, , hull design, and intended use, with common categories including motorized vessels like open motorboats (e.g., skiffs and runabouts for ), cabin motorboats (e.g., cruisers and yachts for extended ), (e.g., jet skis for ), and houseboats (for living aboard). Non-motorized types feature prominently as well, such as paddlecraft (e.g., canoes and kayaks propelled by hand paddles), rowboats (using oars with locks), inflatable boats (for portability and ), and sail-only vessels (relying on ). Larger watercraft, often termed ships, include carriers, ferries, and naval vessels, distinguished from smaller boats by their capacity to operate independently on open seas and support extensive crews. Today, regulatory bodies like the () and national authorities such as the U.S. oversee safety, environmental standards, and classifications to ensure safe and efficient use across these varied applications.

Definition and History

Definition and Scope

Watercraft encompasses any human-made engineered for transportation or operational activities on, under, or across bodies of water, including vessels such as boats, ships, , and . This definition emphasizes mobility and purposeful navigation, thereby excluding stationary or non-propelled floating structures like docks, buoys, or houseboats that lack self-propulsion or capability. The scope of watercraft extends to a variety of hull configurations adapted to different operational demands: displacement hulls, which push water aside to move at low to moderate speeds while maintaining stability; planing hulls, designed to rise and skim across the water surface for high-speed travel; and semi-planing (or semi-displacement) hulls, which blend rounded forward sections for efficient displacement with flatter aft sections to enable partial lift at higher speeds. Watercraft are differentiated from land vehicles, which operate on solid ground, and from , which rely on air for lift, although boundary cases like hydrofoils—equipped with underwater wings that elevate the hull above the —represent hybrid designs that challenge these distinctions by achieving aerodynamic-like efficiency in aquatic settings. Watercraft serve diverse primary functions, including commercial transportation of and passengers across oceans and inland waterways, applications such as , , and operations, recreational pursuits like , , and watersports, exploration of uncharted or remote aquatic regions, and scientific involving oceanographic sampling and environmental monitoring. At the core of watercraft functionality is the principle of flotation, governed by Archimedes' principle, which asserts that the upward buoyant force on a floating or submerged object equals the weight of the fluid it displaces. This relationship ensures stability and prevents sinking when the object's weight matches the displaced fluid's weight. Fb=ρgVF_b = \rho g V Here, FbF_b denotes the buoyant force, ρ\rho the density of the surrounding fluid (typically water), gg the acceleration due to gravity, and VV the volume of displaced fluid.

Historical Development

The history of watercraft traces its origins to prehistoric times, when early humans constructed rudimentary vessels to navigate rivers, lakes, and coastal waters. Around 8000 BCE, simple rafts made from logs or reeds and dugout canoes hewn from single tree trunks emerged as the earliest known forms of watercraft, enabling short-distance travel and resource exploitation. Archaeological evidence includes the from the , a 3-meter-long dugout dated to approximately 8040–7510 BCE, representing one of the oldest preserved examples in . In , a similar 8000-year-old dugout was discovered at Kuahuqiao in China's Lower region, highlighting parallel innovations in techniques. Indications of early rafts also appear in during the (c. 6500–3800 BCE), where reed-bundle constructions facilitated marsh navigation and early trade along the and rivers. Ancient civilizations refined these basic designs into more sophisticated vessels, integrating and stability for warfare, , and . In , reed boats constructed from bundled or reeds, sealed with pitch, became prevalent around 4000 BCE, as depicted in predynastic and , allowing efficient of and . By the Classical period, Greek triremes emerged around 500 BCE as advanced oar-powered warships, featuring three banks of oars for speeds up to 9 knots and bronze-sheathed rams for tactics, crucial in naval battles like Salamis. The Romans adapted similar designs from the BCE onward, employing quinqueremes and biremes with up to 300 oarsmen for Mediterranean dominance, as evidenced by reliefs on and harbor excavations at . These vessels emphasized human muscle power, with sails as auxiliary, reflecting cultural priorities of speed and maneuverability in enclosed seas. Medieval innovations marked a shift toward sail-dependent designs suited for longer voyages and harsher conditions. Viking longships, developed around 800 CE in , exemplified clinker-built construction with overlapping oak planks, shallow drafts for beaching, and a single square complemented by oars, enabling raids across the North Atlantic from to . In , the with fully battened lug sails appeared by the 10th–11th centuries during the , allowing junks up to 100 meters long to carry vast cargoes on monsoon-driven trade routes to and , as documented in contemporary texts like the Pingzhou Ketan. Key technological milestones included the sternpost , affixed directly to the hull for precise steering, which originated in by the 1st century CE but proliferated in by the 12th century via trade contacts, enhancing stability in open waters. Concurrently, the magnetic compass, integrated into Chinese by the 11th century, used spoons or needles to maintain bearings, revolutionizing overland and maritime . The Age of Exploration in the built on these foundations, with the Portuguese representing a pivotal hybrid design. Introduced around CE, the combined sails for windward sailing with a carvel hull for durability, displacing 50–200 tons and enabling transatlantic and African coastal voyages under explorers like . This vessel's versatility facilitated the circumvention of , opening direct sea routes to and sparking global trade networks that exchanged spices, gold, and ideas across continents. Subsequent centuries saw further evolution, including the 16th-century for transoceanic trade and warfare, the 19th-century shift to steam-powered ironclads and screw propellers, and the 20th-century adoption of steel hulls and diesel engines, culminating in the diverse motorized and specialized vessels of today.

Classification and Types

Surface Watercraft

Surface watercraft encompass a diverse array of vessels designed to operate on the surface of , rivers, lakes, and other waterways, primarily supporting transportation, , , and specialized operations. These vessels are distinguished by their interaction with water through hull forms that either displace water for or plane across it for speed, enabling a wide range of applications from personal leisure to global freight. Unlike craft, surface watercraft maintain contact with the water surface throughout operation, relying on and hydrodynamic principles for stability and movement. Displacement vessels form the backbone of surface watercraft, functioning by where the hull pushes water aside to create buoyant support equal to the vessel's weight. These vessels are inherently limited by , calculated as v=1.34×Lv = 1.34 \times \sqrt{L}
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