boat
A boat is a watercraft of a large range of types and sizes, but generally smaller than a ship, which is distinguished by its larger size, shape, cargo or passenger capacity, or its ability to carry boats.
Small boats are typically found on inl ...
s and their systems. This includes at a minimum a hull, with propulsion, mechanical, navigation, safety and other systems as a craft requires.
Construction materials and methods
Wood
Wood is the traditional boat building material used for hull and spar construction. It is buoyant, widely available and easily worked. It is a popular material for small boats (of e.g. length; such as dinghies and sailboats). Its abrasion resistance varies according to the hardness and density of the wood and it can deteriorate if fresh water or marine organisms are allowed to penetrate the wood. Woods such as
Teak
Teak (''Tectona grandis'') is a tropical hardwood tree species in the family Lamiaceae. It is a large, deciduous tree that occurs in mixed hardwood forests. ''Tectona grandis'' has small, fragrant white flowers arranged in dense clusters ( pan ...
,
Totara
''Podocarpus totara'' (; from the Maori-language ; the spelling "totara" is also common in English) is a species of podocarp tree endemic to New Zealand. It grows throughout the North Island and northeastern South Island in lowland, montane a ...
and some
cedar
Cedar may refer to:
Trees and plants
*''Cedrus'', common English name cedar, an Old-World genus of coniferous trees in the plant family Pinaceae
*Cedar (plant), a list of trees and plants known as cedar
Places United States
* Cedar, Arizona
* ...
s have natural chemicals which prevent rot whereas other woods, such as
Pinus radiata
''Pinus radiata'' ( syn. ''Pinus insignis''), the Monterey pine, insignis pine or radiata pine, is a species of pine native to the Central Coast of California and Mexico ( Guadalupe Island and Cedros island). It is an evergreen conifer in the ...
, will rot very quickly. The hull of a wooden boat usually consists of planking fastened to frames and a keel. Keel and frames are traditionally made of hardwoods such as
oak
An oak is a tree or shrub in the genus ''Quercus'' (; Latin "oak tree") of the beech family, Fagaceae. There are approximately 500 extant species of oaks. The common name "oak" also appears in the names of species in related genera, notably ''L ...
while planking can be
oak
An oak is a tree or shrub in the genus ''Quercus'' (; Latin "oak tree") of the beech family, Fagaceae. There are approximately 500 extant species of oaks. The common name "oak" also appears in the names of species in related genera, notably ''L ...
but is more often softwood such as
pine
A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts ...
,
larch
Larches are deciduous conifers in the genus ''Larix'', of the family Pinaceae (subfamily Laricoideae). Growing from tall, they are native to much of the cooler temperate northern hemisphere, on lowlands in the north and high on mountains fur ...
or
cedar
Cedar may refer to:
Trees and plants
*''Cedrus'', common English name cedar, an Old-World genus of coniferous trees in the plant family Pinaceae
*Cedar (plant), a list of trees and plants known as cedar
Places United States
* Cedar, Arizona
* ...
.
Plywood is especially popular for amateur construction but only marine ply using waterproof glues and even laminates should be used. Cheap construction plywood often has voids in the interior layers and is not suitable to boat building as the voids trap moisture and accelerate rot as well as physically weaken the plywood. No plywood is rot resistant and should be coated with epoxy resin and/or a good paint system. Varnish and Linseed oil should not be used on the exterior of a hull for waterproofing. Varnish has about 60% of the water resistance of a good paint system. Only boiled linseed oil should be used on a boat and only in the interior as it has very little water resistance but it is very easy to apply and has a pleasant smell. Note that used linseed rags should not be left in a pile as they can catch fire. A valuable 200-year-old
waka
Waka may refer to:
Culture and language
* Waka (canoe), a Polynesian word for canoe; especially, canoes of the Māori of New Zealand
** Waka ama, a Polynesian outrigger canoe
** Waka hourua, a Polynesian ocean-going canoe
** Waka taua, a Māori w ...
(Maori canoe) caught fire in New Zealand in June 2014 when restorers left rags piled overnight. Raw linseed oil is not suited to boats as it stays damp and oily for a long time. Mildew will grow well on raw linseed oil treated timber but not on boiled linseed oil. More recently introduced tropical woods as mahogany, okoumé,
iroko
Iroko (also known as in Igbo language, '' in the Urhobo language of Southern Nigeria, and as odum in the Kwa languages of Ghana) is a large hardwood tree from the west coast of tropical Africa that can live up to 500 years. This is the common n ...
merbau
''Intsia bijuga'', commonly known as Borneo teak, Johnstone River teak, Kwila, Moluccan ironwood, Pacific teak, scrub mahogany and vesi, is a species of flowering tree in the family Fabaceae, native to the Indo-Pacific. It ranges from Tanzania and ...
. are also used. With tropical species, extra attention needs to be taken to ensure that the wood is indeed FSC-certified. Teak or
iroko
Iroko (also known as in Igbo language, '' in the Urhobo language of Southern Nigeria, and as odum in the Kwa languages of Ghana) is a large hardwood tree from the west coast of tropical Africa that can live up to 500 years. This is the common n ...
is usually used to create the deck and any superstructure. Glue,
screw
A screw and a bolt (see '' Differentiation between bolt and screw'' below) are similar types of fastener typically made of metal and characterized by a helical ridge, called a ''male thread'' (external thread). Screws and bolts are used to f ...
s,
rivets
A rivet is a permanent mechanical fastener. Before being installed, a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite to the head is called the ''tail''. On installation, the rivet is placed in a punched o ...
and/or nails are used to join the wooden components. Before teak is glued the natural oil must be wiped off with a chemical cleaner, otherwise the joint will fail.
Traditional wood construction techniques can be classified into the "shell-first" method (also called "planking first") and the "frame first" method. With "shell first", the form of the hull is determined by joining shaped planks that are fastened together, followed by reinforcing the structure with the frames (or ribs) that are fitted to the inside. With "frame first", the hull shape is established by setting up the frames on the keel and then fastening the planking on the outside.
Some types of wood construction include:
* Carvel, in which a smooth hull is formed by edge joined planks attached to a frame. The planks may be curved in cross section like barrel staves. Carvel planks are generally caulked with oakum or cotton that is driven into the seams between the planks and covered with some waterproof substance. It takes its name from an archaic ship type and is believed to have originated in the Mediterranean. A number of boat building texts are available which describe the carvel planking method in detail.
* Clinker is a planking-first technique originally identified with the
Scandinavia
Scandinavia; Sámi languages: /. ( ) is a subregion in Northern Europe, with strong historical, cultural, and linguistic ties between its constituent peoples. In English usage, ''Scandinavia'' most commonly refers to Denmark, Norway, and Swe ...
wood
Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. It is an organic materiala natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin ...
en planks are fixed to each other with a slight overlap that is beveled for a tight fit. The planks are mechanically connected to each other with copper rivets, bent over iron nails, screws or in modern boats with adhesives. Often, steam bent wooden ribs are fitted inside the hull.
* Strip planking is yet another type of wooden boat construction similar to carvel. It is a glued construction method which is very popular with amateur boatbuilders as it is quick, avoids complex temporary jig work and does not require shaping of the planks.
* Sheet plywood boat building uses sheets of plywood panels usually fixed to longitudinal long wood such the chines, inwhales (sheer clamps) or intermediate stringers which are all bent around a series of frames. By attaching the ply sheets to the longwood rather than directly to the frames this avoids hard spots or an unfair hull. Plywood may be laminated into a round hull or used in single sheets. These hulls generally have one or more chines and the method is called Ply on Frame construction. A subdivision of the sheet plywood boat building method is known as the stitch-and-glue method, where pre-shaped panels of plywood are drawn together then edge glued and reinforced with fibreglass without the use of a frame. Metal or plastic ties, nylon fishing line or copper wires pull curved flat panels into three-dimensional curved shapes. These hulls generally have one or more chines. Marine grade plywood of good quality is designated "WBP" (which stands for water- and boiled-proof) or more usually BS 1088. Australian plywood manufacturers and suppliers have issued warnings that some Asian nations are selling ply stamped BS 1088 which does not meet international standards. Specifically, they say outer plies are too thin (should be minimum) or are very thin (less than ) or high-grade surface ply such as Okoume is combined with a much heavier and wider inner cores. Most high-grade marine Okoume (Gaboon) ply uses lightweight poplar inner cores. Often the 1088 stamp is blurred in the poor Asian ply so it is not clear. In Australia and New Zealand a higher-grade marine ply than BS1088 is AS2272. It requires both faces to be "A" quality, with even-thickness plies. The most common plywood used for this grade is plantation-grown Hoop Pine which is fine grained, very smooth, moderately light (at it is the same weight as Meranti ply and about 13% heavier than genuine poplar cored BS1088 Okoume). Hoop pine has a very high stress rating of F17, indicating high strength. Meranti (Lauan) ply has a stress rating of F14 and Okoume ply F8. Okoume ply is commonly coated with epoxy to increase strength and impact resistance as well as to exclude water. Both types of plywood construction are very popular with amateur builders, and many dinghies such as the Vaurien, Cherub, Tolman, Moth and P class (ply on frame construction) and FJs, FDs and Kolibris (stitch-and-glue method) have been built from it. Another variation is tortured ply where very thin() and flexible (often Okoume)preshaped panels ply are bent into compound curves and sewn together. Little or no framework or longitudinal wood is used. This method is mainly confined to kayaks.
* Cold moulding is a composite method of wooden boat building that uses two or more layers of thin wood, called veneers, oriented in different directions, resulting in a strong monocoque structure, similar to a fibreglass hull but substantially lighter. Sometimes composed of a base layer of strip planking followed by multiple veneers. Sometimes just veneers are used. Cold-moulding is popular in small, medium and very large, wooden super-yachts. Using different types of wood, the builder can lighten some areas such as bow and stern and strengthen other high-stress areas. Sometimes cold-moulded hulls are protected either inside or out or both with fibreglass or similar products for impact resistance, especially when lightweight, soft timber such as cedar is used. This method lends itself to great flexibility in hull shape. Cold-moulded refers to a type of building one-off hulls using thin strips of wood applied to a series of forms at 45-degree angles to the centerline. This method is often called double-diagonal because a minimum of two layers is recommended, each occurring at opposing 45-degree angles. The "hot-moulded" method of building boats, which used ovens to heat and cure the resin, has not been widely used since World War II; and now almost all curing is done at room temperature.
*
Lashed-lug
Lashed-lug boats are ancient boat-building techniques of the Austronesian peoples. It is characterized by the use of sewn holes and later dowels ("treenails") to stitch planks edge-to-edge onto a dugout keel and solid carved wood pieces that form ...
, is a boat-building techniques of the Austronesian peoples. It is characterized by the use of
sewn
Sewing is the craft of fastening or attaching objects using stitches made with a sewing needle and thread. Sewing is one of the oldest of the textile arts, arising in the Paleolithic era. Before the invention of spinning yarn or weaving fabri ...
holes and later dowels ("treenails") to stitch planks edge-to-edge. The planks are further lashed together and onto ribs with fiber ropes wrapped around protruding carved lugs on the inside surfaces. This is a shell-first (or planking first) method of construction The seams between planks are also sealed with absorbent
tapa bark
Tapa cloth (or simply ''tapa'') is a barkcloth made in the islands of the Pacific Ocean, primarily in Tonga, Samoa and Fiji, but as far afield as Niue, Cook Islands, Futuna, Solomon Islands, Java, New Zealand, Vanuatu, Papua New Guinea and H ...
and fiber that expands when wet or
caulk
Caulk or, less frequently, caulking is a material used to seal joints or seams against leakage in various structures and piping.
The oldest form of caulk consisted of fibrous materials driven into the wedge-shaped seams between boards on ...
ed with resin-based preparations.
Metal
Iron and steel
Either used in sheet or alternatively,
plate
Plate may refer to:
Cooking
* Plate (dishware), a broad, mainly flat vessel commonly used to serve food
* Plates, tableware, dishes or dishware used for setting a table, serving food and dining
* Plate, the content of such a plate (for example: ...
for all-metal hulls or for isolated structural members. It is strong, but heavy (despite the fact that the thickness of the hull can be less). It is generally about 30% heavier than aluminium and somewhat more heavy than polyester. The material rusts unless protected from water (this is usually done by means of a covering of paint). Modern steel components are
welded
Welding is a fabrication process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool, causing fusion. Welding is distinct from lower temperature techniques such as braz ...
or bolted together. As the welding can be done very easily (with common welding equipment), and as the material is very cheap, it is a popular material with amateur builders. Also, amateur builders which are not yet well established in building steel ships may opt for
DIY
"Do it yourself" ("DIY") is the method of building, modifying, or repairing things by oneself without the direct aid of professionals or certified experts. Academic research has described DIY as behaviors where "individuals use raw and sem ...
construction kits. If steel is used, a zinc layer is often applied to coat the entire hull. It is applied after
sandblasting
Sandblasting, sometimes known as abrasive blasting, is the operation of forcibly propelling a stream of abrasive material against a surface under high pressure to smooth a rough surface, roughen a smooth surface, shape a surface or remove s ...
(which is required to have a cleaned surface) and before painting. The painting is usually done with
lead paint
Lead paint or lead-based paint is paint containing lead. As pigment, lead(II) chromate (, "chrome yellow"), lead(II,IV) oxide, (, "red lead"), and lead(II) carbonate (, "white lead") are the most common forms.. Lead is added to paint to accele ...
(Pb3O4). Optionally, the covering with the zinc layer may be left out, but it is generally not recommended.
Zinc
Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodi ...
anode
An anode is an electrode of a polarized electrical device through which conventional current enters the device. This contrasts with a cathode, an electrode of the device through which conventional current leaves the device. A common mnemonic ...
s also need to be placed on the ship's hull. Until the mid-1900s, steel sheets were
rivet
A rivet is a permanent mechanical fastener. Before being installed, a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite to the head is called the ''tail''. On installation, the rivet is placed in a punched ...
ed together.
Aluminum
Aluminum and aluminum alloys are used both in sheet form for all-metal hulls or for isolated structural members. Many sailing spars are frequently made of aluminium after 1960. It is the lightest material for building large boats (being 15–20% lighter than polyester and 30% lighter than steel). Aluminium is relatively cheap in comparison with wood or steel in most countries. In addition it is relatively easy to cut, bend and weld. Galvanic
corrosion
Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials (usually a metal) by chemical or electrochemical reaction with their environment. Corrosion engi ...
below the waterline in salt water is a serious concern, particularly in marinas where there are other conflicting metals. Aluminium is most commonly found in yachts, pontoon and power boats that are not kept permanently in the water. Aluminium yachts are particularly popular in France.
Cupronickel
A relatively expensive metal used only very occasionally in boatbuilding is
cupronickel
Cupronickel or copper-nickel (CuNi) is an alloy of copper that contains nickel and strengthening elements, such as iron and manganese. The copper content typically varies from 60 to 90 percent. (Monel is a nickel-copper alloy that contains a minimu ...
. Arguably the ideal metal for boat hulls, cupronickel is reasonably tough, highly resistant to corrosion in seawater, and is (because of its copper content) a very effective
antifouling
Biofouling or biological fouling is the accumulation of microorganisms, plants, algae, or small animals where it is not wanted on surfaces such as ship and submarine hulls, devices such as water inlets, pipework, grates, ponds, and rivers that ...
metal. Cupronickel may be found on the hulls of premium
tugboat
A tugboat or tug is a marine vessel that manoeuvres other vessels by pushing or pulling them, with direct contact or a tow line. These boats typically tug ships in circumstances where they cannot or should not move under their own power, su ...
s,
fishing boat
A fishing vessel is a boat or ship used to catch fish in the sea, or on a lake or river. Many different kinds of vessels are used in commercial, artisanal and recreational fishing.
The total number of fishing vessels in the world in 2016 was ...
s and other working
boat
A boat is a watercraft of a large range of types and sizes, but generally smaller than a ship, which is distinguished by its larger size, shape, cargo or passenger capacity, or its ability to carry boats.
Small boats are typically found on inl ...
Fiberglass
Fiberglass (American English) or fibreglass ( Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass clo ...
( glass-reinforced plastic or GRP) is typically used for production boats because of its ability to reuse a female mould as the foundation for the shape of the boat. The resulting structure is strong in tension but often needs to be either laid up with many heavy layers of resin-saturated fiberglass or reinforced with wood or foam in order to provide stiffness. GRP hulls are largely free of corrosion though not normally fireproof. These can be solid fiberglass or of the sandwich (cored) type, in which a core of
balsa
''Ochroma pyramidale'', commonly known as the balsa tree, is a large, fast-growing tree native to the Americas. It is the sole member of the genus ''Ochroma''. The tree is famous for its wide usage in woodworking, with the name ''balsa'' being ...
,
foam
Foams are materials formed by trapping pockets of gas in a liquid or solid.
A bath sponge and the head on a glass of beer are examples of foams. In most foams, the volume of gas is large, with thin films of liquid or solid separating the ...
or similar material is applied after the outer layer of fiberglass is laid to the mould, but before the inner skin is laid. This is similar to the next type, composite, but is not usually classified as composite, since the core material in this case does not provide much additional strength. It does, however, increase stiffness, which means that less resin and fiberglass cloth can be used in order to save weight. Most fibreglass boats are currently made in an open mould, with fibreglass and resin applied by hand ( hand-lay-up method). Some are now constructed by vacuum infusion where the fibres are laid out and resin is pulled into the mould by atmospheric pressure. This can produce stronger parts with more glass and less resin, but takes special materials and more technical knowledge. Older fibreglass boats before 1990 were often not constructed in controlled temperature buildings leading to the widespread problem of fibreglass pox, where seawater seeped through small holes and caused delamination. The name comes from the multitude of surface pits in the outer gelcoat layer which resembles smallpox. Sometimes the problem was caused by atmospheric moisture being trapped in the layup during construction in humid weather.
Composite material
"Composite construction" involves a variety of
composite material
A composite material (also called a composition material or shortened to composite, which is the common name) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or ...
s and methods: an early example was a timber carvel skin attached to a frame and deck beams made of iron. Sheet copper anti-fouling ("copper=bottomed") could be attached to a wooden hull provided the risk of galvanic corrosion was minimised. Fast cargo vessels once were copper-bottomed to prevent being slowed by marine fouling. GRP and ferrocement hulls are classic composite hulls, the term "composite" applies also to plastics reinforced with fibers other than glass. When a hull is being created in a female mould, the composite materials are applied to the mould in the form of a
thermosetting plastic
In materials science, a thermosetting polymer, often called a thermoset, is a polymer that is obtained by irreversibly hardening (" curing") a soft solid or viscous liquid prepolymer (resin). Curing is induced by heat or suitable radiation and ...
(usually epoxy, polyester, or vinylester) and some kind of fiber cloth (
fiberglass
Fiberglass (American English) or fibreglass ( Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass clo ...
,
kevlar
Kevlar (para-aramid) is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s a ...
carbon fiber
Carbon fiber-reinforced polymers (American English), carbon-fibre-reinforced polymers (Commonwealth English), carbon-fiber-reinforced plastics, carbon-fiber reinforced-thermoplastic (CFRP, CRP, CFRTP), also known as carbon fiber, carbon compo ...
, etc.). These methods can give strength-to-weight ratios approaching that of aluminum, while requiring less specialized tools and construction skills.
Ferrocement
First developed in the mid-19th century in both France and Holland, ferrocement was also used for the D-DayMulberry harbours. After a buzz of excitement among homebuilders in the 1960s, ferro building has since declined.
Ferrocement is a relatively cheap method to produce a hull, although unsuitable for commercial mass production. A steel and iron "armature" is built to the exact shape of the hull, ultimately being covered in galvanised chicken netting. Then, on a single day, the cement is applied by a team of plasterers. The cement:sand ratio is a very rich 4:1. As the hull thickness is typically 2.5 to 3 cms, ferrocement is unsuitable for boats less than about 15 metres
LOA
( ), also called loa or loi, are spirits in the African diasporic religion of Haitian Vodou. They have also been incorporated into some revivalist forms of Louisiana Voodoo. Many of the lwa derive their identities in part from deities venerat ...
as there is a weight penalty; above that length there is no penalty. Properly plastered ferrocement boats have smooth hulls with fine lines, and amateur builders are advised to use professional plasterers to produce a smooth finish. In the 1960s and 1970s, particularly in Australia and New Zealand, the cheapness of ferro construction encouraged amateur builders to build hulls larger than they could afford, not anticipating that the fitting-out costs of a larger boat can be crippling.
The advantages of a ferro hull are:
* cannot burn, rot, or rust; & no osmosis
* good insulation: cool in summer, warm in winter
* tougher than GRP, and almost as tough as a steel vessel; (and if damaged, easily repaired almost anywhere in the world)
* properly built, a ferro hull is as fair as a GRP hull.
* they may be cheap to buy (see disadvantages, below)
The disadvantages are:
* many home-built ferro boats are lumpy, overweight and ugly.
* some early builders, realising that their creation proved to be disappointing, scuttled their vessels and fraudulently claimed insurance.
* accordingly, ferro yachts may be difficult to sell and nigh impossible to insure.
''See also'':
concrete ship Concrete ships are built of steel and ferrocement (reinforced concrete) instead of more traditional materials, such as steel or wood. The advantage of ferrocement construction is that materials are cheap and readily available, while the disadvantag ...
There are many hull types, and a builder should choose the most appropriate one for the boat's intended purpose. For example, a sea-going vessel needs a hull which is more stable and robust than a hull used in rivers and canals. Hull types include:
* Smooth curve hull: these are rounded and free of chines or corners.
* Chined hulls: these hulls have flat panels (typically plywood) which meet at a sharp angle known as the "chine". Chined hulls range from simple flat-bottomed boats where the topsides and bottom meet at about 110 degrees (such as banks dories and sharpies) to skiffs where the bottom is arced rather than flat. Multi-chine hulls allow an approximation of a round hull shape.
* Flat-bottomed hull: flat-bottomed hulls are suitable for canals and non-tidal rivers. They are often shallow-draft, and may operate in shallower water. They are cheap to build but, being less stable and having no keel to give directional stability, they are unsuitable for sea-going vessels. (However, large ships are almost always flat bottomed, having a suitably large draft to overcome the problems of small flat-bottomed boats).
* Displacement hulls: a displacement hull always remains partly submerged. Such a hull has a maximum "hull speed" which is a function of its waterline length. An exception is the catamaran, whose twin hulls are usually so fine that they do not engender a bow wave.
* Planing hulls: planing hulls have a shape that allows the boat to rise out of the water as the speed increases. Sail boats that plane are typical V-shaped at the bows and flat-bottomed aft. Hydroplanes are very light, flat bottomed, high powered speed boats that plane easily on flat water, but they become unstable in rough water. Powerboats designed for rough water are usually deep V-bottomed with a deadrise angle of about 20–23 degrees. The most common form is to have at least one chine to allow for stability when cornering and for a supportive surface on which to ride while planing. Planing hulls allow much higher speeds to be achieved, as they are not limited by the waterline length the way displacement hulls are. Planing hulls need sufficient power to "reach the plane", after which the lack of drag allows high speeds yet with reduced power consumption.
Glossary
*
Anchor
An anchor is a device, normally made of metal , used to secure a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin ''ancora'', which itself comes from the Greek ἄ ...
: a device for holding a boat to the seabed, typically with chain and rope. Traditional anchors include the fisherman, Danforth, and plough types (such as the "CQR" and "Delta"). Recently, far more effective anchors with more reliable holding include the "Rocna" and the "Ultra", both of which are spade anchors.
* Bitts: a pair of short strong posts of wood or steel on the deck of a boat intended to take mooring lines. Also called "bollards".
*
Bilge
The bilge of a ship or boat is the part of the hull that would rest on the ground if the vessel were unsupported by water. The "turn of the bilge" is the transition from the bottom of a hull to the sides of a hull.
Internally, the bilges (usu ...
: the lowest part of the interior of a hull. Water, fuel tanks, ballast, and heavy stores are variously placed in the bilge to lower the craft's centre of gravity.
*
Bilge keels
A bilge keel is a nautical device used to reduce a ship's tendency to roll. Bilge keels are employed in pairs (one for each side of the ship). A ship may have more than one bilge keel per side, but this is rare. Bilge keels increase hydrodynamic re ...
: a pair of short keels fitted on either side of the hull. Less hydro-dynamically efficient than a fin keel, they have a shallower draft. Full-length bilge keels add rigidity to a hull. Bilge keel craft are found in areas with large tidal ranges to keep the vessel upright when dried out.
*
Bilge pump
A bilge pump is a water pump used to remove bilge water. Since fuel can be present in the bilge, electric bilge pumps are designed to not cause sparks. Electric bilge pumps are often fitted with float switches which turn on the pump when the bilg ...
: a manual or electric pump for draining the bilge. Set at the lowest point, its inlet is protected by a screen to minimize blockages.
*
Block
Block or blocked may refer to:
Arts, entertainment and media Broadcasting
* Block programming, the result of a programming strategy in broadcasting
* W242BX, a radio station licensed to Greenville, South Carolina, United States known as ''96.3 ...
: a pulley used to give a line a fair lead and multiply its hauling power. Single and double sheave blocks are common, triple rare.
*
Bobstay
A bobstay is a part of the rigging of a sailing boat or ship. Its purpose is to counteract the upward tension on the bowsprit from the jibs and forestay. A bobstay may run directly from the stem to the bowsprit,Bow: The forward end of a watercraft.
*
Bowsprit
The bowsprit of a sailing vessel is a spar extending forward from the vessel's prow. The bowsprit is typically held down by a bobstay
A bobstay is a part of the rigging of a sailing boat or ship. Its purpose is to counteract the upward tensio ...
: a spar that extends forward of the stem to provide an anchor for a jib.
* Breasthook: A roughly triangular component located immediately aft of the stem and between the inwales, sheer clamps, or rails of a small boat.
* Bulkhead: internal transverse walls dividing a hull.
* Bulwarks: topsides which extend above the deck, often capped with a rail and fitted with scuppers.
* Cam cleat: a mechanical device for holding a line fast between two spring-loaded jaws.
* Catheads: timbers protruding approximately at right angles from the foredeck to support an anchor outboard of the hull.
* Capstan a vertical winch secured to the foredeck, used primarily to hoist an anchor.
* Carlin: a longitudinal strip parallel to, but inboard of, the inwale (sheer clamp) for supporting the inboard edge of the side deck and the side of the cabin cladding.
*
Chainplate
A chainplate is a metal plate used to fasten a shroud or stay to the hull of a sailboat
A sailboat or sailing boat is a boat propelled partly or entirely by sails and is smaller than a sailing ship. Distinctions in what constitutes a sailing ...
: a metal bracket through-bolted through the hull for anchoring a shroud.
*
Centreboard
A centreboard or centerboard (US) is a retractable hull appendage which pivots out of a slot in the hull of a sailboat, known as a ''centreboard trunk'' (UK) or ''centerboard case'' (US). The retractability allows the centreboard to be raised t ...
: (also dagger board) a movable keel which may be raised and lowered to accommodate shallow water and point of sail. It is held in place within a centerboard trunk.
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Chine
A chine () is a steep-sided coastal gorge where a river flows to the sea through, typically, soft eroding cliffs of sandstone or clays. The word is still in use in central Southern England—notably in East Devon, Dorset, Hampshire and the Is ...
: the part of a hull at the turn of the bilge. It may be "hard" (i.e. sharply angled) or "soft" (gradually contoured). A chine made of a single timber is known as a chine log.
* Cleat: a fitting designed to tie off lines. The most common form has a central anchor point and opposing protrusions for taking turns of a line. Also cam and jam cleats.
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Coaming
Coaming is any vertical surface on a ship designed to deflect or prevent entry of water. It usually consists of a raised section of deck plating around an opening, such as a cargo hatch. Coamings also provide a frame onto which to fit a hatch cov ...
: any vertical surface on a ship designed to deflect or prevent entry of water
* Cockpit: the seating area aft in a small decked vessel where the helm is.
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Counter stern
The stern is the back or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite the bow, the foremost part of a ship. Orig ...
: a stern rising well above the waterline ending in a point or rounded contour rather than a vertical transom. A variation is the "truncated counter".
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Companionway
In the architecture of a ship, a companion or companionway is a raised and windowed hatchway in the ship's deck, with a ladder leading below and the hooded entrance-hatch to the main cabins. A companionway may be secured by doors or, commonly in ...
: a passage, fitted with either steps or a ladder, for transiting between decks.
* Crosstree: a form of spreader mounted athwarts a mast for attaching or tensioning shrouds or stays.
* Deck: a structure covering part or all of a hull, supported by beams.
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Deck beam
Deck may refer to:
A level or platform Buildings and structures
*Deck (bridge), the roadway surface of a bridge
* Deck (building), an outdoor floor attached to a building made of wood or wood-like material
*Another name for a storey
*The concrete ...
: A beam for supporting the deck.
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Dolphin striker
A dolphin striker (an older term for a martingale boom or simply a martingale; sometimes called a striker) is a small vertical or near vertical ancillary spar spanning between the bowsprit and martingale thereby redirecting the tension in the forw ...
: a short downward-facing spar fitted mid-way along a bowsprit to tension the
bobstay
A bobstay is a part of the rigging of a sailing boat or ship. Its purpose is to counteract the upward tension on the bowsprit from the jibs and forestay. A bobstay may run directly from the stem to the bowsprit,Dorade box
A dorade box (also called a dorade vent, collector box, or simply a "ventilator") is a type of vent that permits the passage of air in and out of the cabin or engine room of a boat while keeping rain, spray, and sea wash out.
Design
The basic for ...
: a ventilation intake consisting of a pivoting cowling atop a deck mounted self-draining box, named after the 1931 yacht Dorade where it was first used.
* Epoxy resin: a two-part thermosetting polymer increasingly used in modern wooden boat building variously as an adhesive, filler (admixed with other materials), and a moisture-resistant barrier in hull and deck construction, sometimes applied in conjunction with reinforcing cloths such as fibreglass, kevlar or carbon fibre.
* Fairlead: a deck fitting for redirecting a line and minimizing chafe.
* Fiddle (or fiddle rail). a low rail on a counter, stove, or table for preventing items from sliding off when the boat is heeled at sea. Catamarans have less need than monohulls for fiddles.
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Freeboard
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 relativ ...
: the part of the hull between the waterline and deck of a vessel.
* Furling headsail: a jib or other headsail attached to a rotating mechanism that furls and unfurls it, manually or automatically.
* Garboard: the strake immediately on either side of the keel.
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Gimbal
A gimbal is a pivoted support that permits rotation of an object about an axis. A set of three gimbals, one mounted on the other with orthogonal pivot axes, may be used to allow an object mounted on the innermost gimbal to remain independent of ...
: a device that allows a stove or compass to self-level by pivoting in two horizontal planes simultaneously.
* Gooseneck: a pivoting metal fitting that joins a boom to a mast. Many goosenecks can be adjusted to trim the luff of a sail.
* Grab rail: an extended horizontal handhold, usually atop a cabin.
* Gudgeon: the female part of a pintle-and-gudgeon pivot or hinge, characteristically used to attach a rudder to a vessel.
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Gunwale
The gunwale () is the top edge of the hull of a ship or boat.
Originally the structure was the "gun wale" on a sailing warship, a horizontal reinforcing band added at and above the level of a gun deck to offset the stresses created by firin ...
: (pronounced "gunnel") the upper longitudinal structural member of the hull, typically fitted with scuppers to drain the deck.
* Hatch: an opening in the deck or cabin of a vessel, with a hinged, sliding, or removable cover.
* Heads: a marine toilet, deriving from toileting at the catsheads in square rigger days.
* Hull: the bottom and sides of a vessel.
* Inwale (or "sheer clamp"): the upper, inner longitudinal structural member of the hull, to which topside panels are fixed.
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Keel
The keel is the bottom-most longitudinal structural element on a vessel. On some sailboats, it may have a hydrodynamic and counterbalancing purpose, as well. As the laying down of the keel is the initial step in the construction of a ship, in Br ...
: the main structural member of a traditional vessel, running fore and aft from bow to stern on its centerline. It provides ballast for stability, and resistance to leeway moving through the water.
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Keelson
The keelson or kelson is a reinforcing structural member on top of the keel in the hull of a wooden vessel.
In part V of “ Song of Myself”, American poet Walt Whitman
Walter Whitman (; May 31, 1819 – March 26, 1892) was an Am ...
: an internal beam fixed to the top of the keel to strengthen the joint of the upper members of the boat to the keel.
* King plank: the central board of a foredeck. Its sides are notched to receive the tapered forward ends of deck planking so that no end grain is exposed.
* Knee: a short L shaped piece of wood that joins or strengthens the joint in boat parts that meet between roughly 60 and 120 degrees. It may be a natural crook from a suitable wood species, sawn from a larger piece of timber, or laminated to size. Commonly used on thwarts to join topsides or keelsons to join transoms. A hanging knee sits upright beneath a thwart to support it. Hanging knees often support carlins where a full frame would be inconvenient.
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Locker
A locker is a small, usually narrow storage compartment. They are commonly found in dedicated cabinets, very often in large numbers, in various public places such as locker rooms, workplaces, elementary schools, middle and high schools, tran ...
: an enclosed storage space
* Mast: a large vertical spar which supports the sails. It may be supported by standing rigging, but some rigs (such a junks) have unstayed masted.
* Mast step: a socket to take the downward thrust of the mast and hold it in position. May be on the keel or on the deck in smaller craft. A deck-stepped mast may be supported by a column below the deck.
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Mizzen
The mast of a sailing vessel is a tall spar, or arrangement of spars, erected more or less vertically on the centre-line of a ship or boat. Its purposes include carrying sails, spars, and derricks, and giving necessary height to a navigation l ...
: the aftmost mast and sail in a yawl or ketch, or in a vessel with three or more masts.
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Oar
An oar is an implement used for water-borne propulsion. Oars have a flat blade at one end. Rowers grasp the oar at the other end.
The difference between oars and paddles is that oars are used exclusively for rowing. In rowing the oar is connecte ...
a wooden pole enlarged on one end to resist the water when pulled.
* Painter: a short line at the bow of a small boat for tying it off.
* Parrot beak: a spring-loaded stainless steel fitting on the end of a spinnaker pole attaching it to the sail.
* Pintle: the male half of a pintle-and-gudgeon pivot or hinge.
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Ratlines
Ratlines () are lengths of thin line tied between the shrouds of a sailing ship to form a ladder. Found on all square-rigged ships, whose crews must go aloft to stow the square sails, they also appear on larger fore-and-aft rigged vessels t ...
(traditionally ''ratlins''): lines woven horizontally between the shrouds of a square-rigged ship to provide footholds for ascending to the yards.
* Rib: a thin strip of pliable timber laid athwarts inside a hull from inwale to inwale at regular close intervals to reinforce its planking. Ribs differ from frames or futtocks in being far smaller dimensions and bent in place compared to frames or futtocks, which are normally sawn to shape, or natural crooks that are shaped to fit with an adze, axe or chisel.
* Rigging: standing rigging (either "stays" or shrouds") are the wire cables or rods that support the mast(s). Running rigging are the ropes ("sheets") to control the sails.
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Rowlock
A rowlock , sometimes spur (due to the similarity in shape and size), oarlock (USA) or gate, is a brace that attaches an oar to a boat. When a boat is rowed, the rowlock acts as a fulcrum for the oar.
On ordinary rowing craft, the rowlocks are ...
(pronounced "rollock";(also "oarlock"): a 'U' shaped metal device that secures an oar and acts as a fulcrum during the motion of rowing.
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Rudder
A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other vehicle that moves through a fluid medium (generally air or water). On an aircraft the rudder is used primarily to counter adve ...
: a hinged vertical plate at the stern for steering a craft. There may be more than one rudder.
* Sampson post: a strong vertical post which supports a ship's windlass and the heel of its
bowsprit
The bowsprit of a sailing vessel is a spar extending forward from the vessel's prow. The bowsprit is typically held down by a bobstay
A bobstay is a part of the rigging of a sailing boat or ship. Its purpose is to counteract the upward tensio ...
, also used to making off mooring lines.
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Scupper
A scupper is an opening in the side walls of a vessel or an open-air structure, which allows water to drain instead of pooling within the bulwark or gunwales of a vessel, or within the curbing or walls of a building.
There are two main kinds of s ...
s: gaps in the bulwarks permitting water to drain off the deck.
* Shackle: a U-shaped fitting secured by a removable pin for securely connecting chains, lines, and other fittings. Known as a "snap shackle" when fitted with a spring-loaded pin.
* Sheave box: a plastic or stainless steel box that holds a pulley that is fixed in position as on a mast head.
* Sheer: the generally curved shape of the upper hull. It is traditionally lowest amidships to maximize freeboard at the ends of the hull. Sheer can be reverse, higher in the middle to maximize space inside, or straight or a combination of shapes.
* Sheet: a line which controls the clew of a sail.
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Skeg
A skeg (or skegg or skag) is a sternward extension of the keel of boats and ships which have a rudder mounted on the centre line. The term also applies to the lowest point on an outboard motor or the outdrive of an inboard/outboard."A small fin f ...
: a vertical blade beneath the hull, typically to support and protect the rudder and to promote the rudder's efficiency by preventing "stalling".
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Spar
SPAR, originally DESPAR, styled as DE SPAR, is a Dutch multinational that provides branding, supplies and support services for independently owned and operated food retail stores. It was founded in the Netherlands in 1932, by Adriaan van Well, ...
: s length of timber, aluminium, steel or carbon fibre of approximately round or pear shaped cross-section which supports a sail or sails. Spars include the mast, boom, gaff, yard, bowsprit, prod, boomkin, pole and dolphin striker.
* Sole: the floor of a cabin or cockpit.
* Spinnaker (or "kite"): a large, lightweight, down-wind sail used on fore and aft rigged yachts such as sloops to dramatically increase sail area typically used running with the wind.
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Spring
Spring(s) may refer to:
Common uses
* Spring (season)
Spring, also known as springtime, is one of the four temperate seasons, succeeding winter and preceding summer. There are various technical definitions of spring, but local usage of ...
: the amount of fore and aft curvature in the keel.
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Stanchion
A stanchion () is a sturdy upright fixture that provides support for some other object. It can be a permanent fixture.
Types
In architecture stanchions are the upright iron bars in windows that pass through the eyes of the saddle bars or horizo ...
s: a post for holding life lines on a deck.
* Stainless steel: a corrosion-resistant alloy of mild steel and small percentages of such metals as copper, chromium, molybdenum, and nickel. Common alloys are "18/8" (known as "surgical stainless steel") and "316" ("marine grade"), which contains more salt-water resistant nickel.
* Stays/ shrouds: standing or running rigging which holds a spar in position (e.g. forestay, backstay, bobstay). Formerly made of rope, typically of braided stainless steel wire, occasionally solid metal rod.
* Stem: a continuation of the keel upwards at the bow where the two sides of the hull meet.
* Stern: the aftmost part of a boat, often ending in a transom.
* Stern sheets a flat area or deck, inboard of the transom in a small boat. It may contain hatches to access below decks or provide storage on deck for life saving equipment.
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Strake
On a vessel's hull, a strake is a longitudinal course of planking or plating which runs from the boat's stempost (at the bows) to the sternpost or transom (at the rear). The garboard strakes are the two immediately adjacent to the keel on ea ...
: planking, running from the "garboard" strake affixed to the keel to the "sheer" strake below the caprail.
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Stringer
Stringer may refer to:
Structural elements
* Stringer (aircraft), or longeron, a strip of wood or metal to which the skin of an aircraft is fastened
* Stringer (slag), an inclusion, possibly leading to a defect, in cast metal
* Stringer (stairs), ...
(also "batten"): a long relatively thin, knot free length of wood, running fore and aft, often used to reinforce planking on the inside of the hull.
* Synthetic rope: lines manufactured from chained chemicals. The four most common are: polyester (including brand names Dacron and Terylene), a strong, low stretch line, usually plaited (braided) used for running rigging; nylon, a strong but elastic line resistant to shock loads, best suited for mooring lines and anchor warps. It is usually laid (twisted) so to make it easier to grip when hauling; polypropylene, a light, cheap, slippery, buoyant line, typically laid, which is by far the weakest of the four, and deteriorates when exposed to sunlight. Commonly used on commercial fishing boats using nets; and Kevlar, an extremely strong and expensive fibre with almost no stretch, usually braided and best suited for halyards.
* Taff rail: a railing at the extreme stern of a vessel.
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Thwart
A thwart is a part of an undecked boat that provides seats for the crew and structural rigidity for the hull. A thwart goes from one side of the hull to the other. There might be just one thwart in a small boat, or many in a larger boat, especial ...
: a transverse member used to maintain the shape of the topsides of a small boat, often doubling as a seat.
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Tiller
A tiller or till is a lever used to steer a vehicle. The mechanism is primarily used in watercraft, where it is attached to an outboard motor, rudder post or stock to provide leverage in the form of torque for the helmsman to turn the rudder. ...
: a forward-facing attached to the rudder allowing a helmsman to steer a boat. On a dinghy, the tiller may have a hinged extension called a "jigger".
* Toe rail: an upright longitudinal strip of wood surrounding a deck near the sheer, especially forward, for safety and to provide purchase when a boat is heeled.
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Topping lift
The topping lift (more rarely known as an uphaul) is a line which applies upward force on a boom on a sailboat.
Part of the running rigging, topping lifts are primarily used to hold a boom up when the sail is lowered. This line would run from nea ...
: a line running from a cleat on the mast through a block at the masthead and down to the aft end of a boom for supporting the boom when not in use or when reefing.
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Topsides
The topsides on a boat, ship, watercraft, or floating production storage and offloading (FPSO) vessel, is that part of the hull (watercraft), hull between the waterline and the Deck (ship), deck.Rognaas, G., Xu, J., Lindseth, S., & Rosendahl, F. ( ...
: the side planking of a boat from the waterline to the sheerstrake.
* Transom: a vertical part of the hull at the stern. Transoms provide width and additional buoyancy at the stern. Dinghies may attach an outboard motor to the transom.
*Warp: anchor line, traditionally made of stiff natural fibre such as hemp, today of stronger, lighter, synthetic fibres such as laid nylon, prized for its elasticity in absorbing shock loads on an anchor.
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Winch
A winch is a mechanical device that is used to pull in (wind up) or let out (wind out) or otherwise adjust the tension of a rope or wire rope (also called "cable" or "wire cable").
In its simplest form, it consists of a spool (or drum) attach ...
: a geared device providing both friction and mechanical advantage in sail trimming, hoisting large sails, and retrieving an anchor. Some winches are self-tailing, allowing efficient one-man usage, others electrically powered.
* Wind pennant: a small pivoting masthead wind indicator.
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Yard
The yard (symbol: yd) is an English unit of length in both the British imperial and US customary systems of measurement equalling 3 feet or 36 inches. Since 1959 it has been by international agreement standardized as exactly ...
: a horizontal spar on a square rigged ship fitted to the forward side of a mast, holding a square sail forward of the shrouds. An extension to the yard is the "yard-arm".
Gallery
File:Boatshed-band-saw.jpg, Small boatyard horizontal band saw,
Hội An
Hội An (), formerly known as Fai-Fo or Faifoo, is a city with a population of approximately 120,000 in Vietnam's Quảng Nam Province and is noted as a UNESCO World Heritage Site since 1999. Along with the Cu Lao Cham archipelago, it is part ...
File:Planks-first.jpg, Small boat using the planks first method, Hội An
File:Boat-frames.jpg, Boat nearing completion with frames added, Hội An
File:Plank-on-frame-boatbuilding.jpg, Plank on frame construction, Quy Nhơn
File:Fishing-hull.jpg, Almost completed offshore fishing hull, Quy Nhơn
File:Trenails.jpg, Plank fixing, trenails and red lead paint, Quy Nhơn
File:Boat-building-timber-frames.jpg, Repaired frames, barge hull,
Sa Đéc
Sa Đéc is a Provincial city in Đồng Tháp Province in the Mekong Delta of southern Vietnam. It is a river port and agricultural and industrial trading center. The Sa Đéc economic zone consists of Châu Thành, Lai Vung and Lấp Vò ...
Center for Wooden Boats
The Center for Wooden Boats (CWB) is a museum dedicated to preserving and documenting the maritime history of the Pacific Northwest area of the United States. CWB was founded by Dick Wagner in Seattle in the 1970s and has grown to include three si ...
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Lofting
Lofting is a drafting technique to generate curved lines. It is used in plans for streamlined objects such as aircraft and boats. The lines may be drawn on wood and the wood then cut for advanced woodworking. The technique can be as simple as bend ...
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Marine propulsion
Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through water. While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical systems consisting of an electr ...
Shipbuilding
Shipbuilding is the construction of ships and other floating vessels. It normally takes place in a specialized facility known as a shipyard. Shipbuilders, also called shipwrights, follow a specialized occupation that traces its roots to befo ...