Strépy-Thieu boat lift (Belgium, Wallonia)

The Falkirk Wheel (Scotland)

Peterborough Lift Lock (Canada)

A boat lift, ship lift, or lift lock is a machine for transporting boats between water at two different elevations, and is an alternative to the canal lock and the canal inclined plane.

It may be either vertically moving, like the ship lifts in Germany, Belgium, the lift at "Les Fontinettes" in France or the Anderton boat lift in England, or rotational, like the Falkirk Wheel in Scotland.

History[link]

The first known boat lift was a 2.5 ton tub boat lift on the Churprinz mining canal in Halsbrücke near Dresden. It lifted boats 7 metres without the use of caissons. The lift operated between 1789 and 1868.^[1] For a period of time after the opening of the Churprinz lift boat lifts were of an experimental nature with the engineer James Green reporting that 5 had been built between 1796 and 1830. He credited the invention to Dr James Anderson of Edinburgh.^[2] Erasmus Darwin's Commonplace Book dated 1777–1778 includes a design for a canal lift based on balanced water filled caissons on page 58-59^[3]

An example of these early lifts was the one constructed at Mells on the Dorset and Somerset Canal.^[2] Lifts on the tub boat section of the Grand Western Canal entered into operation in 1835 becoming the first non experimental boat lifts in Britain.^[4]

1904 the Peterborough Lift Lock designed by Richard Birdsall Rogers opened in Canada. The lift system is operated by gravity alone, with the upper bay of the two bay system loaded with an additional 30 cm of water as to give it greater weight.

The world's still highest boat lift, with a 73.15 metre height difference and European Class IV (1350 tonne) capacity, is the Strépy-Thieu boat lift in Belgium.

As projected, the new ship lift at the Three Gorges Dam will be even higher and able to lift vessels of up to 3,000 tons displacement.^[5] However, as yet engineers have been unable to design a mechanism with the lifting power called for in the lift specifications.^{[citation needed]} The boat lift at Longtan is reported to be even higher in total with a maximum vertical lift of 179m in two stages when completed.^[6]

Selected lift locks[link]

See also[link]

UK Waterways portal

• List of boat lifts
• Lock (water transport)
• Balance lock
• Canal inclined plane – another technique for lifting boats.
• Caisson lock: a submerged boat lift.
• Shiplift – used for moving vessels in shipyards
• Water slope
• Saint-Louis-Arzviller boat lift, France – which is actually a canal inclined plane
• Portable boat lift

References[link]

Further reading[link]

• Tew, David (1984). Canal Inclines and Lifts. Sutton Books. ISBN 0-86299-031-9. 
• Uhlemann, Hans-Joachim (2002). Canal lifts and inclines of the world (English Translation ed.). Internat. ISBN 0-9543181-1-0. 

External links[link]

Wikimedia Commons has media related to: Boat lifts

• "The lift-locks on the Canal du Centre, at Houdeng and Strépy-Thieu, Belgium". 2005-05-14. http://www.ping.be/~pin02722/Strepy.htm. Retrieved 2007-09-14.  Source mentions it own sources
• The International Canal Monuments List
• ^ Three Gorges Dam
• Big Chute, Ontario – in fact an inclined plane
• Twin Ship Elevator Lüneburg - Technical data of the Scharnebeck twin ship lift near Lüneburg, Germany
• Dutch boat lift page

At 17 metres long, the Severn class lifeboats are the largest class of UK lifeboat

A boat is a watercraft of any size designed to float or plane, to provide passage across water. Usually this water will be inland (lakes) or in protected coastal areas. However, boats such as the whaleboat were designed to be operated from a ship in an offshore environment. In naval terms, a boat is a vessel small enough to be carried aboard another vessel (a ship). Another less restrictive definition is a vessel that can be lifted out of the water. Strictly speaking and uniquely a submarine is a boat as defined by the Royal Navy^{[citation needed]}. Some boats too large for the naval definition include the Great Lakes freighter, riverboat, narrowboat and ferryboat. The term armed boat, used primarily by English speaking naval forces, referred to any boat carrying either a cannon or armed occupants, such as marines^{[citation needed]}.

History[link]

A boat in an Egyptian tomb painting from about 1450 BCE

Babur crossing river Son; folio from an illustrated manuscript of ‘Babur-Namah’, Mughal, Akbar Period, AD 1598

Boats have served as short-distance transportation since early times.^[1] Circumstantial evidence, such as the early settlement of Australia over 40,000 years ago, and findings in Crete dated 130,000 years ago,^[2] suggests that boats have been used since ancient times. The earliest boats have been predicted^[3] to be logboats. The oldest boats to be found by archaeological excavation are logboats from around 7,000–10,000 years ago. The oldest recovered boat in the world is the Pesse canoe; it is a dugout or hollowed tree trunk from a Pinus sylvestris. It was constructed somewhere between 8200 and 7600 B.C. This canoe is exhibited in the Drents Museum in Assen, Netherlands;^[4][5] other very old dugout boats have been recovered.^[6][7][8][9] A 7,000 year-old seagoing boat made from reeds and tar has been found in Kuwait.^[10]

Boats were used between 4000 BCE and 3000 BCE in Sumer,^[1] ancient Egypt^[11] and in the Indian Ocean.^[1]

Boats played a very important part in the commerce between the Indus Valley Civilization and Mesopotamia.^[12] Evidence of varying models of boats has also been discovered in various Indus Valley sites.^[13][14] The Uru wooden big boat made in Beypore a village in south Calicut, Kerala, in southwestern India. These have been used by the Arabs and Greeks since ancient times as trading vessels. This mammoth wooden ship was constructed using teak, without any iron or blueprints which has transportation capacity of 400 tonnes.

The accounts of historians Herodotus, Pliny the Elder, and Strabo suggest that boats were being used for commerce and traveling.^[13]

Types[link]

A tug boat is used for towing or pushing other, larger vessels.

Boats can be categorized into three types:

• Unpowered or human-powered boats. (Unpowered boats include rafts and floats meant for one-way downstream travel. Human-powered boats include canoes, kayaks, gondolas and boats propelled by poles like a punt.)
• Sailing boats, which are boats propelled solely by means of sails.
• Motorboats, which are boats propelled by mechanical means, such as engines.

Parts and terminology[link]

Several key components make up the main structure of most boats. The hull is the main structural component of the boat which actually provides buoyancy for the boat. The roughly horizontal, but chambered structures spanning the hull of the boat are referred to as the deck. In a ship there are often several decks, but a boat is unlikely to have more than one, if any at all. Above the deck are the superstructures. The underside of a deck is the deck head.

An enclosed space on a boat is referred to as a cabin. Several structures make up a cabin: the similar but usually lighter structure which spans a raised cabin is a coach-roof. The "floor" of a cabin is properly known as the sole, but is more likely to be called the floor (a floor is properly, a structural member which ties a frame to the keelson and keel). The vertical surfaces dividing the internal space are bulkheads.

The keel is a lengthwise structural member to which the frames are fixed (sometimes referred to as a backbone).

The front (or forward end) of a boat is called the bow. Boats of earlier times often featured a figurehead protruding from the front of the bows. The rear (or aft end) of the boat is called the stern. The right side (facing forward) is starboard and the left side is port.

Building materials[link]

A ship's lifeboat, built of steel, rusting away in the wetlands of Folly Island, South Carolina, United States.

Until the mid 19th century most boats were of all natural materials; primarily wood although reed, bark and animal skins were also used. Early boats include the bound-reed style of boat seen in Ancient Egypt, the birch bark canoe, the animal hide-covered kayak and coracle and the dugout canoe made from a single log. By the mid 19th century, many boats had been built with iron or steel frames but still planked in wood. In 1855 ferro-cement boat construction was patented by the French. They called it Ferciment. This is a system by which a steel or iron wire framework is built in the shape of a boat's hull and covered (trowelled) over with cement. Reinforced with bulkheads and other internal structure, it is strong but heavy, easily repaired, and, if sealed properly, will not leak or corrode. These materials and methods were copied all over the world, and have faded in and out of popularity to the present. As the forests of Britain and Europe continued to be over-harvested to supply the keels of larger wooden boats, and the Bessemer process (patented in 1855) cheapened the cost of steel, steel ships and boats began to be more common. By the 1930s boats built of all steel from frames to plating were seen replacing wooden boats in many industrial uses, even the fishing fleets. Private recreational boats in steel are uncommon. In the mid 20th century aluminium gained popularity. Though much more expensive than steel, there are now aluminium alloys available that will not corrode in salt water, and an aluminium boat built to similar load carrying standards could be built lighter than steel.

A wooden boat operating near shore

Around the mid 1960s, boats made of glass-reinforced plastic, more commonly known as fibreglass, became popular, especially for recreational boats. The United States Coast Guard refers to such boats as 'FRP' (for Fibre Reinforced Plastic) boats.

Fibreglass boats are extremely strong, and do not rust (iron oxide), corrode, or rot. They are, however susceptible to structural degradation from sunlight and extremes in temperature over their lifespan. Fibreglass provides structural strength, especially when long woven strands are laid, sometimes from bow to stern, and then soaked in epoxy or polyester resin to form the hull of the boat. Whether hand laid or built in a mould, FRP boats usually have an outer coating of gelcoat which is a thin solid colored layer of polyester resin that adds no structural strength, but does create a smooth surface which can be buffed to a high shine and also acts as a protective layer against sunlight. FRP structures can be made stiffer with sandwich panels, where the FRP encloses a lightweight core such as balsa or foam. Cored FRP is most often found in decking which helps keep down weight that will be carried above the waterline. The addition of wood makes the cored structure of the boat susceptible to rotting which puts a greater emphasis on not allowing damaged sandwich structures to go unrepaired. Plastic based foam cores are less vulnerable. The phrase 'advanced composites' in FRP construction may indicate the addition of carbon fibre, kevlar(tm) or other similar materials, but it may also indicate other methods designed to introduce less expensive and, by at least one yacht surveyor's eyewitness accounts,^[15] less structurally sound materials.

Cold molding is similar to FRP in as much as it involves the use of epoxy or polyester resins, but the structural component is wood instead of fibreglass. In cold moulding very thin strips of wood are laid over a form or mould in layers. This layer is then coated with resin and another directionally alternating layer is laid on top. In some processes the subsequent layers are stapled or otherwise mechanically fastened to the previous layers, but in other processes the layers are weighted or even vacuum bagged to hold layers together while the resin sets. Layers are built up thus to create the required thickness of hull.

People have even made their own boats or watercraft out of materials such as foam or plastic, but most homebuilts today are built of plywood and either painted or covered in a layer of fibreglass and resin.

Propulsion[link]

The most common means are:

The Wanli Emperor enjoying a boat ride on a river with an entourage of guards and courtiers in this Ming Dynasty Chinese painting.

• human power (rowing, paddling, setting pole and so on.)
• wind power (sailing)
• Motor powered propellers
  • Inboard
    • internal combustion (gasoline, diesel, heavy fuel oil)
    • steam (coal, fuel oil)
  • Inboard/Outboard (sterndrive)
    • gasoline
    • diesel
  • Outboard
    • electric
  • paddle wheel
  • Water jet (personal water craft, jetboat)
  • Air fans (hovercraft, air boat)

Track-driven propulsion[link]

The water caterpillar boat propulsion system (Popular Science Monthly, December 1918, p 68)

An early uncommon means of boat propulsion was referred to as the water caterpillar which is similar in construction to paddles on a conveyor belt and preceded the development of tracked vehicles such as military tanks and earth moving equipment. A series of paddles on chains moved along the bottom of the boat to propel it over the water.^[16]

The first water caterpillar was developed by Desblancs in 1782 and propelled by a steam engine. In the United States the first water caterpillar was patented in 1839 by William Leavenworth of New York.

Buoyancy[link]

A floating boat displaces its weight in water. The material of the boat hull may be denser than water, but if this is the case then it forms only the outer layer. If the boat floats, the mass of the boat (plus contents) as a whole divided by the volume below the waterline is equal to the density of water (1 kg/l). If weight is added to the boat, the volume below the waterline will increase to keep the weight balance equal, and so the boat sinks a little to compensate.

See also[link]

Abora Boat building Cabin cruiser Canoe Dory Flat-bottomed boat Glossary of nautical terms Gondola Halkett boat Inflatable boat Kayak

Launch (boat) Lifeboat (rescue) Lifeboat (shipboard) Log canoe Motorboat Narrowboat Naval architecture Panga (boat) Pirogue Raft Reed boat

Rescue craft Row boat Sailboat Sampan Ship Skiff Super yacht Traditional fishing boats Yacht Ferry Barge

Wikimedia Commons has media related to: Boat Wikiquote has a collection of quotations related to: Boats

References[link]

External links[link]

• PDRacer - The Easiest Sailboat In the World To Build
• Sailboats database: sailboat data sheets all over the world
• University of Washington Libraries Digital Collections -- Freshwater and Marine Image Bank -- Vessels - images of boats and vessels

Look up lift in Wiktionary, the free dictionary.

Lift may mean:

• Lift (force), a mechanical force generated by an object moving through a fluid
• Lift (soaring), rising air used by soaring birds and glider, hang glider and paraglider pilots for soaring flight
• Lift (soft drink), a brand of carbonated beverage produced and marketed by the Coca-Cola Company
• Lift (data mining), a measure of the performance of a model at segmenting the population
• Airlift, in logistics, the act of transporting people or cargo from point to point using aircraft
• Figure skating lifts, movements in pair skating and ice dancing
• Hitchhiking, a form of transport in which the traveller tries to get a lift (or ride) from another traveller
• Plastic surgery, surgery to "lift" the skin:
  • Rhytidectomy or "face lift", a type of plastic surgery
  • Mastopexy or "breast lift", a type of plastic surgery

Physical devices[link]

• Elevator or lift, a device used for raising and lowering people or goods
  • Rack lift, a type of elevator
  • Ski lift, an aerial or surface lift for uphill transport
  • Space elevator, a hypothetical structure for transporting material from a planet's surface into space
  • Wheelchair lift (also called a "platform lift"), a powered device to assist a person in a wheelchair in passing a vertical barrier
  • Sling lift (also called a "Hoyer Lift", mobile lift, ceiling lift, or patient lift), a manual or powered lift or hoist to assist a caregiver in transferring a disabled patient from a bed to a wheelchair, gurney, toilet, or chair
• Elevator shoe, an insole device that makes a person appear taller
• Forklift, a trucking device
• Automobile modification to increase the ride height:
  • Body lift, an adaptation (of fixed height) to lift the automobile body from the frame
  • Suspension lift, a modification raising the suspension of the automobile

Media[link]

• London International Festival of Theatre (LIFT)
• De Lift (The Lift), a 1983 horror film by Dick Maas

In music[link]

• Lift (band), a German rock band
• Lift (Audio Adrenaline album) (2001)
• Lift (Love and Rockets album) (1998)
• "Lift" (Poets of the Fall song), a 2004 single
• Lift (Sister Hazel album) (2004)
• Lift (Shannon Noll album) (2005)
  • "Lift" (Shannon Noll song)
• "Lift", an unreleased song by Radiohead
• Retake or lift, a symbol used in musical notation

Mathematics[link]

• Homotopy lifting property, in mathematics, a unique path over a map
• Lift (mathematics), a morphism h from X to Z such that gh = f

Other uses[link]

• Lift (web framework), a Web application framework for Scala, which runs on the Java Virtual Machine
• Lift Conference, a conference about the challenges and opportunities of technology in society
• Lift, a special type of arrow in the video game engine StepMania

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