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  • Marine propulsion

    Marine propulsion

    • This piglix contains articles or sub-piglix about Marine propulsion

    • Jet-powered hydroplanes

    • This piglix contains articles or sub-piglix about Jet-powered hydroplanes


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    • Marine engines

    • This piglix contains articles or sub-piglix about Marine engines


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    • Propellers

    • This piglix contains articles or sub-piglix about Propellers


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    • Marine steam propulsion

    • This piglix contains articles or sub-piglix about Marine steam propulsion


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    • Air cavity system

    • Air cavity system (or ACS) is a modern marine hull design concept based upon capturing air beneath a vessel's hull to reduce drag and increase speed and fuel efficiency. ... Read »


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    • Air-independent propulsion

    • Air-independent propulsion (AIP) is any marine propulsion technology that allows a non-nuclear submarine to operate without access to atmospheric oxygen (by surfacing or using a snorkel). AIP can augment or replace the diesel-electric propulsion system of non-nuclear vessels. The United States Navy uses the hull class ... Read »


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    • Airboat

    • An airboat is a flat-bottomed vessel (jon boat) propelled in a forward direction by an aircraft-type propeller and powered by either an aircraft or automotive engine. They are commonly used for fishing, bowfishing, hunting, and ecotourism. Airboats are a very popular means of transportation in marshy and/or shallow ar ... Read »


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    • Alcyone (ship)

    • Alcyone (ship)

      The Alcyone is a ship operated by the Cousteau Society. It was created as an expedition ship and to test the operation of a new kind of marine propulsion system, the turbosail. The Alcyone's two turbosails are used to augment its diesel engines. Since the accidental sinking of the Calypso, the Alcyone has been the Cous ... Read »


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    • Astern propulsion

    • Astern propulsion (as applied to a ship) is a maneuver in which a ship's propelling mechanism is used to develop thrust in a retrograde direction. Astern propulsion does not necessarily imply the ship is moving astern (in reverse); astern propulsion is used to slow a ship by applying a force in the direction of the ste ... Read »


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    • Azimuth thruster

    • An azimuth thruster is a configuration of marine propellers placed in pods that can be rotated to any horizontal angle (azimuth), making a rudder unnecessary. These give ships better maneuverability than a fixed propeller and rudder system. There are two major variants, based on the location of the motor: The mos ... Read »


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    • Azipod

    • Azipod is an electric podded azimuth thruster produced by ABB Group. Developed in Finland jointly by the shipbuilding company Masa-Yards and ABB, Azipod is a marine propulsion unit consisting of a fixed pitch propeller mounted on a steerable gondola ("pod") which also contains the electric motor driving the propeller. ... Read »


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    • B. Hick and Sons

    • Hick, Hargreaves & Co.

      B. Hick and Sons, subsequently Hick, Hargreaves & Co, was a British engineering company based at the Soho Ironworks in Bolton, England.Benjamin Hick, a partner in Rothwell, Hick and Rothwell, later Rothwell, Hick & Co., set up the company in partnership with two of his sons, John (1815–1894) and Benjamin (1818†... Read »


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    • Bank effect

    • Bank effect refers to the tendency of the stern of a ship to swing toward the near bank when operating in a river or constricted waterway. The asymmetric flow around a ship induced by the vicinity of banks causes pressure differences (Bernoulli's principle) between port and starboard sides. As a result, a lateral forc ... Read »


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    • Blackbird (land yacht)

    • Blackbird is an experimental land yacht, built by Rick Cavallaro and John Borton of Sportvision, sponsored by Google and Joby Energy in association with the San Jose State University aeronautics department to demonstrate that it is possible to sail directly downwind faster than the wind. In a test supervised and recogn ... Read »


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    • Bladelets

    • Used in centrifugal impeller terminology, bladelets are the more 'Metro' version of the common engineering description of splitters (shorter blades that do not extend into the centre of the impeller). The term is thought to have originated among the middle-upper level management at medical device engineering companies, ... Read »


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    • Boat ski

    • The Boat ski is a shock absorbing system invented by Spede Pasanen for the bow of a small motorboat with a powerful outboard motor. Its functioning principle is damping the chopping motion of the boats bow with a ski-like device attached to the bow through a car shock absorber. When a small boat is equipped with a pow ... Read »


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    • Bridge (nautical)

    • The bridge of a ship is the room or platform from which the ship can be commanded. When a ship is underway the bridge is manned by an OOW (officer of the watch) aided usually by an AB (able seaman) acting as lookout. During critical maneuvers the captain will be on the bridge supported, perhaps, by an OOW as an extra s ... Read »


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    • Bunker oil

    • Fuel oil, (also known as heavy oil, marine fuel or furnace oil) is a fraction obtained from petroleum distillation, either as a distillate or a residue. Broadly speaking, fuel oil is any liquid fuel that is burned in a furnace or boiler for the generation of heat or used in an engine for the generation of power, except ... Read »


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    • COGES

    • Combined gas and steam (COGAS) is the name given to marine compound powerplants comprising gas and steam turbines, the latter being driven by steam generated using the heat from the exhaust of the gas turbines. In this way, some of the otherwise lost energy can be reclaimed and the specific fuel consumption of the plan ... Read »


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    • Combined diesel and diesel

    • Combined diesel and diesel (CODAD) is a propulsion system for ships using two diesel engines to power a single propeller shaft. A gearbox and clutches enable either of the engines or both of them together to drive the shaft. ... Read »


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    • Combined diesel and gas

    • Combined diesel and gas (CODAG) is a type of propulsion system for ships which need a maximum speed that is considerably faster than their cruise speed, particularly warships like modern frigates or corvettes. It consists of diesel engines for cruising and gas turbines that can be switched on for high-speed transits. ... Read »


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    • Combined diesel or gas

    • Combined diesel or gas (CODOG) is a type of propulsion system for ships that need a maximum speed that is considerably faster than their cruise speed, particularly warships like modern frigates or corvettes. For every propeller shaft there is one diesel engine for cruising speed and one geared gas turbine for high spe ... Read »


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    • Combined diesel-electric and gas

    • Combined diesel-electric and gas (CODLAG) is a modification of the combined diesel and gas propulsion system for ships. A variant, called the combined diesel-electric or gas (CODLOG) system, contains the same basic elements but will not allow simultaneous use of the alternative drive sources. A CODLAG system employs e ... Read »


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    • Combined gas and gas

    • Combined gas turbine and gas turbine (COGAG) is a type of propulsion system for ships using two gas turbines connected to a single propeller shaft. A gearbox and clutches allow either of the turbines to drive the shaft or both of them combined. Using one or two gas turbines has the advantage of having two different po ... Read »


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    • Combined gas and steam

    • Combined gas and steam (COGAS) is the name given to marine compound powerplants comprising gas and steam turbines, the latter being driven by steam generated using the heat from the exhaust of the gas turbines. In this way, some of the otherwise lost energy can be reclaimed and the specific fuel consumption of the plan ... Read »


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    • Combined gas or gas

    • Combined gas or gas (COGOG) is a propulsion system for ships using gas turbine engines. A high efficiency, low output turbine is used for cruising speeds with a high output turbine being used for high-speed operations. A clutch allows either turbine to be selected, but there is no gearbox to allow operation of both tur ... Read »


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    • Combined nuclear and steam propulsion

    • Combined nuclear and steam propulsion system (CONAS) is used on the Kirov-class guided missile cruisers. Complementary to the nuclear component there are two conventional boilers, installed as a backup in case of reactor failure. Both components are capable of driving two geared steam turbines, generating 120,000 hp ( ... Read »


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    • Combined steam and gas

    • Combined steam and gas (COSAG) is a propulsion system for ships using a combination of steam turbines and gas turbines to power the shafts. A gearbox and clutches enable either of the engines or both of them together to drive the shaft. It has the advantage of the cruising efficiency and reliability of steam and the ra ... Read »


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    • Diesel-electric transmission

    • Diesel-electric transmission, or diesel-electric powertrain is used by a number of vehicle and ship types for providing locomotion. A diesel-electric transmission system includes a diesel engine connected to an electrical generator, creating electricity that powers electric traction motors. No clutch is required. Befo ... Read »


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    • Ducted propeller

    • A ducted propeller, also known as a Kort nozzle, is a propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed by Luigi Stipa (1931) and Ludwig Kort (1934). The Kort nozzle ... Read »


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    • E-Ship 1

    • E-Ship 1

      The E-Ship 1 is a RoLo cargo ship that made its first voyage with cargo in August 2010. The ship is owned by the third-largest wind turbine manufacturer, Germany's Enercon GmbH. It is used to transport wind turbine components. The E-Ship 1 is a Flettner ship: four large rotorsails that rise from its deck are rotated ... Read »


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    • Electric boat

    • General Dynamics Electric Boat

      Coordinates: 41°20′40″N 72°04′46″W / 41.344343°N 72.079526°W / 41.344343; -72.079526 General Dynamics Electric Boat (GDEB) is a subsidiary of General Dynamics Corporation. It has been the primary builder of submarines for the United States Navy for more than 100 years. ... Read »


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    • Electric outboard motor

    • Electric outboard motors are an option for boat propulsion. Most electric outboard motors have 0.5 to 4 kW direct current (DC) electric motors, operated at 12 to 60 volts DC. These systems have the propeller fixed directly to the motor, which is mounted in the lower unit under water – see trolling motor. This setu ... Read »


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    • Engine room

    • On a ship, the engine room or ER is the propulsion machinery spaces of the vessel. To increase a vessel's safety and chances of surviving damage, the machinery necessary for operations may be segregated into various spaces. The engine room is generally the largest physical compartment of the machinery space. It houses ... Read »


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    • Experiment (horse-powered boat)

    • Experiment (horse-powered boat)

      Experiment was an early nineteenth-century boat powered by horses and incorporating the then novel idea of a screw propeller. Experiment was a horse-powered ferry boat. It was a twelve-ton three-mast boat drawing a few feet of water, about 100 feet (30 m) long by 20 feet (6.1 m) beam. Its driving mechanism, ... Read »


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    • Fire room

    • On a ship, the fire room, or FR or boiler room or stokehold, referred to the space, or spaces, of a vessel where water was brought to a boil. The steam was then transmitted to a separate engine room, often (but not always) located immediately aft, where it was utilized to power the vessel. To increase the safety and da ... Read »


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    • Flettner rotor

    • A Flettner rotor is a smooth cylinder with disc end plates which is spun along its long axis and, as air passes at right angles across it, the Magnus effect causes an aerodynamic force to be generated in the third dimension. In a rotor ship the rotor stand vertical and lift is generated at right angles to the wind, to ... Read »


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    • Forces on sails

    • Forces on sails result from movement of air that interacts with sails and gives them motive power for sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and sail-powered land vehicles. Similar principles in a rotating frame of reference apply to wind mill sails and wind turbine blades, which are ... Read »


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    • Forward Drive

    • A "forward drive" is a form of marine propulsion that leverages forward-facing counter-rotating props to pull the boat through water rather than pushing it, with an undisturbed water flow to the propellers. The engine sits just forward of the transom while the drive unit (outdrive or drive leg) lies outside the hull. ... Read »


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    • Froude resistance curve

    • In continuum mechanics, the Froude number (Fr) is a dimensionless number defined as the ratio of the flow inertia to the external field (the latter in many applications simply due to gravity). Named after William Froude (/ˈfruːd/;), the Froude number is based on the speed–length ratio which he defined as: w ... Read »


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    • Gas turbine

    • A gas turbine, also called a combustion turbine, is a type of internal combustion engine. It has an upstream rotating compressor coupled to a downstream turbine, and a combustion chamber in between. The basic operation of the gas turbine is similar to that of the steam power plant except that air is used instead of wa ... Read »


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    • George Forrester and Company

    • George Forrester and Company was a British marine engine and locomotive manufacturer at Vauxhall Foundry in Liverpool, established by Scottish engineer George Forrester (b. 1780/81). The company opened in 1827 as iron founders and commenced building steam locomotives in 1834. Under Alexander Allan's attendance the ... Read »


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    • Bill Hamilton (engineer)

    • Sir Charles William "Bill" Feilden Hamilton OBE (26 July 1899 – 30 March 1978) was a New Zealander who developed the modern jetboat, and founder of what is now the world's leading water jet manufacturing company - CWF Hamilton Ltd. Hamilton never claimed to have invented the jet boat. He once said "I do not claim ... Read »


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    • Hull speed

    • Hull speed or displacement speed is the speed at which the wavelength of the boat's bow wave (in displacement mode) is equal to the boat length. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well. When hull speed is reached, ... Read »


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    • Hunter Wheel

    • The Hunter Wheel was a device intended to improve the propulsion of steam-powered ships and evaluated in the middle 1840s. At the time, as ships were transitioning from sail to steam engine power, the understanding of the principles of hydrodynamics and efficient use of steam was in its infancy. The vertically mou ... Read »


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    • Impeller

    • An impeller (also written as impellor or impellar) is a rotor used to increase (or decrease in case of turbines) the pressure and flow of a fluid. An impeller is a rotating component of a centrifugal pump, usually made of iron, steel, bronze, brass, aluminium or plastic, which transfers energy from the motor that ... Read »


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    • Integrated electric propulsion

    • Integrated electric propulsion (IEP) or full electric propulsion (FEP) or integrated full electric propulsion (IFEP) is an arrangement of marine propulsion systems such that gas turbines or diesel generators or both generate three phaseelectricity which is then used to power electric motors turning either propellers or ... Read »


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    • Integrated Electric Propulsion

    • Integrated electric propulsion (IEP) or full electric propulsion (FEP) or integrated full electric propulsion (IFEP) is an arrangement of marine propulsion systems such that gas turbines or diesel generators or both generate three phaseelectricity which is then used to power electric motors turning either propellers or ... Read »


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    • Internal drive propulsion

    • Internal drive propulsion is a form of marine propulsion commonly used in recreational boating. Like other forms of motorized boating, internal drive propulsion employs a motor that turns a propeller to move the boat forward. The primary difference between internal drive boats and stern drive boats is that the propelle ... Read »


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    • Jacking gear

    • A jacking gear (also known as a turning gear) is a device placed on the main shaft of an engine or the rotor of a turbine. The jacking gear rotates the shaft or rotor and associated machinery (such as reduction gears and main turbines), to ensure uniform cool-down. Without turning, hogging or sagging can occur. Additi ... Read »


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    • Jetboat

    • A jetboat is a boat propelled by a jet of water ejected from the back of the craft. Unlike a powerboat or motorboat that uses an external propeller in the water below or behind the boat, a jetboat draws the water from under the boat through an intake and into a pump-jet inside the boat, before expelling it through a no ... Read »


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    • Windermere kettle

    • A Windermere kettle is a form of steam-operated tea urn or samovar installed on some steam launches. They are a metal vessel containing a few pints of water. Inside the vessel is a steam heating coil. When hot or boiling water is required, a valve is opened and steam from the boat's propulsion boiler is passed through ... Read »


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    • Kitchen rudder

    • The Kitchen rudder is the familiar name for "Kitchen's Patent Reversing Rudders", a combination rudder and directional propulsion delivery system for relatively slow speed displacement boats which was invented in the early 20th century by John G.A.Kitchen of Lancashire, England. It turns the rudder into a directional t ... Read »


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    • L-drive

    • An L-drive is a type of azimuth thruster where the electric motor is mounted vertically, removing the second bevel gear from the drivetrain. Azimuth thruster pods can be rotated through a full 360 degrees, allowing for rapid changes in thrust direction and eliminating the need for a conventional rudder. This form of po ... Read »


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    • Lurssen effect

    • The Lurssen effect, used in the design of high-speed boats, is a reduction in wave-making resistance provided by two small rudders mounted on each side of the main rudder and turned outboard. These rudders force the water under the hull outward, lifting the stern, thus reducing drag, and lowering the wake height, which ... Read »


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    • Magnetohydrodynamic drive

    • A magnetohydrodynamic drive or MHD propulsor is a method for propelling vessels using only electric and magnetic fields with no moving parts, using magnetohydrodynamics. The working principle involves electrification of the propellant (gas or water) which can then be directed by a magnetic field, pushing the vehicle i ... Read »


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    • Marine LNG Engine

    • A marine LNG engine is a dual fuel engine that uses natural gas and bunker fuel to convert chemical energy in to mechanical energy. Due to natural gas’ cleaner burning properties, the use of natural gas in merchant ship propulsion plants is becoming an option for companies in order to comply with IMO and MARPOL en ... Read »


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    • Marine propulsion

    • Marine propulsion is the mechanism or system used to generate thrust to move a ship or boat across water. While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical systems consisting of an electric motor or engine turning a propeller, or less frequently, in pump-jets, a ... Read »


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    • Nissan Outboard Motors

    • Nissan outboard motors are produced by Tohatsu Corporation of Tokyo, Japan. They are the second largest producer of outboard motors in the world and produce environmentally conscious TLDI series of two-stroke low pressure direct injection outboards that meet current United States Environmental Protection Agency regulat ... Read »


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    • Nuclear marine propulsion

    • Nuclear marine propulsion is propulsion of a ship or submarine with heat provided by a nuclear power plant. The power plant heats water to produce steam and it is this steam that powers the steam turbines and turbo generators. The power is then transferred to a gearbox that reduces the ratio by around 50 to 1 and this ... Read »


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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 are that paddles are held by the paddler, and are not connected with the vessel. Oars generally are connected to the vessel by means of rowlocks or th ... Read »


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    • Outboard motor

    • An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom. They are the most common motorized method of propelling small watercraft. As well as providing propulsion, outboards pro ... Read »


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    • Paddle

    • A paddle is a tool used for pushing against liquids, either as a form of propulsion in a boat or as an implement for mixing. Paddles commonly used in canoes consist of a wooden, fibreglass, carbon fibre or metal rod (the shaft) with a handle on one end and a rigid sheet (the blade) on the other end. Paddles for us ... Read »


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    • Pleuger rudder

    • The Pleuger rudder (also known as a Dutch rudder) is a power assisted ship's rudder. It creates a flow of water in the direction the rudder points powered by an auxiliary electric motor. This aids maneuverability at low speeds greatly, since it operates on a similar principle to a thruster. A ducted propeller is mount ... Read »


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    • Propeller walk

    • Propeller walk is the term for a propeller's tendency to rotate a boat as well as accelerating it forwards or backwards. A right-handed propeller (which rotates clockwise [as viewed from the stern] when in forward gear) will tend to push the stern of the boat to starboard, thereby pushing the bow to port and turning t ... Read »


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    • Propulsor

    • A propulsor is a mechanical device that gives propulsion. The word is commonly used in the marine vernacular, and implies a mechanical assembly that is more complicated than a propeller. The Kort nozzle and pump-jet are examples. An example propulsor is shown in the accompanying picture. It has a shroud which cuts dow ... Read »


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    • Pump-jet

    • A pump-jet, hydrojet, or water jet is a marine system that creates a jet of water for propulsion. The mechanical arrangement may be a ducted propeller (axial-flow pump), a centrifugal pump, or a mixed flow pump which is a combination of both centrifugal and axial designs. The design also incorporates an intake to provi ... Read »


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    • Quant pole

    • A quant (quant pole) is a pole used to propel a barge (barge pole) or punt through water. A barge quant often has a cap at the top and a prong at the bottom to stop it from sinking into the mud. On the Norfolk Broads these are called a Bott and a Shoe respectively. A quant used with a punt is about 4 metres (13 ft) ... Read »


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    • Rim-driven thruster

    • Rim-Driven Thruster is a novel type of propulsion unit which was presented at the Shipbuilding, Machinery & Marine Technology 2010 trade fair (SMM) by the companies Voith and Van der Velden. The Rim-driven thruster is a marine propeller which does not need a hub for transmission of the driving torque. Conventional pro ... Read »


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    • Roller ship

    • The roller ship, or roller steamer, was an unconventional – and unsuccessful – ship design of the late nineteenth century, which attempted to propel itself by means of large wheels. Only one such vessel was constructed – the Ernest-Bazin, named for its inventor – which was found to be impractical. ... Read »


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    • Rotor ship

    • A rotor ship, or Flettner ship, is a type of ship designed to use the Magnus effect for propulsion. The Magnus effect is a force acting on a spinning body in a moving airstream, which acts perpendicularly to the direction of the airstream. In addition to the familiar principle of backspin imparted to increase range in ... Read »


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    • Sail

    • A sail derives power from the wind to provide motive power for sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and sail-powered land vehicles. Sails mobilize lift and drag properties as air passes along the surface, functioning similarly to a wing in a vertical orientation. In most cases sail ... Read »


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    • Sailcloth

    • Sailcloth encompasses a wide variety of materials that span those from natural fibers, such as flax (linen), hemp or cotton in various forms including canvas, to synthetic fibers, including nylon, polyester, aramids, and carbon fibers. Doek is Dutch for cloth, which was evolved into the English word "duck" in refe ... Read »


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    • Saildrive

    • A saildrive is a transmission system for a boat whose inboard engine has a horizontal output shaft. The saildrive's input shaft is therefore also horizontal. That input shaft is geared so as to drive a vertical intermediate shaft extending downward through the hull. The intermediate shaft is then geared so as to drive ... Read »


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    • Sailing faster than the wind

    • High-performance sailing is achieved with low forward surface resistance—encountered by catamarans, sailing hydrofoils, iceboats or land sailing craft—as the sailing craft obtains motive power with its sails or aerofoils at speeds that are often faster than the wind. High-performance watercraft that can ... Read »


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    • Schottel

    • Schottel (company), German manufacturer of ship propulsion Schottel or Schöttel is a German surname. Notable people with the surname include: ... Read »


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    • Schottel (company)

    • Schottel (company)

      Schottel is a manufacturer of propulsion and steering systems for ships and offshore applications. The company founder Josef Becker invented the rudderpropeller, a z-drive, in 1950. Today the company develops and manufactures azimuth propulsion, maneuvering and steering systems. In 2014 the subsidiary Schottel Hydro wa ... Read »


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    • Screw steamer

    • A screw steamer or screw steamship is an old style term for a steamship or steamboat, powered by a steam engine, using one or more propellors, also known as screws, to propel it through the water. Such a ship was also known as an 'iron screw steam ship'. In the 19th century, this designation was normally used in contr ... Read »


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    • Slow steaming

    • Slow steaming refers to the practice of operating transoceanic cargo ships, especially container ships, at significantly less than their maximum speed. An analyst at National Ports and Waterways Institute stated in 2010 that nearly all global shipping lines were using slow steaming to save money on fuel. Slow steaming ... Read »


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    • Solutions for cavitation in marine propellers

    • With the introduction of the marine propeller back in the early 19th century, cavitation during operation has always been a limiting factor on efficiency of ships. Cavitation in marine propellers develops when the propeller operates at a high speed. To combat cavitation, ships have to operate at a lower speed than maxi ... Read »


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    • Stave bearing

    • A stave bearing is a simple journal bearing where a shaft rotates in a bearing housing. Rather than the usual arrangement where the fixed part of the bearing surrounds most of the circumference of the shaft in one or two pieces, a stave bearing uses a large number of axial staves to support the shaft. A large housing i ... Read »


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    • Marine steam engine

    • External video

      A marine steam engine is a steam engine that is used to power a ship or boat. This article deals mainly with marine steam engines of the reciprocating type, which were in use from the inception of the steamboat in the early 19th century to their last years of large-scale manufacture during World War II. Reciprocating s ... Read »


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    • Sterndrive

    • A sterndrive or inboard/outboard drive (I/O) is a form of marine propulsion which combines inboard power with outboard drive. The engine sits just forward of the transom while the drive unit (outdrive or drive leg) lies outside the hull. The drive unit (outdrive) carries power from the inboard engine, typically mo ... Read »


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    • Still engine

    • The Still engine was a piston engine that simultaneously used both steam power from an external boiler, and internal combustion from gasoline or diesel, in the same unit. The waste heat from the cylinder and internal combustion exhaust was directed to the steam boiler, resulting in claimed fuel savings of up to 10%. Th ... Read »


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    • Hot-bulb engine

    • The hot-bulb engine is a type of internal combustion engine in which fuel is ignited by being brought into contact with a red-hot metal surface inside a bulb, followed by the introduction of air (oxygen) compressed into the hot-bulb chamber by the rising piston. There is some ignition when the fuel is introduced, but i ... Read »


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    • Stuffing box

    • A stuffing box is an assembly which is used to house a gland seal. It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements. A stuffing box of a sailboat will have a stern tube that's slightly bigger than the prop shaft. It will also have packing nut thre ... Read »


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    • Thrust block

    • A thrust block, also known as a thrust box, is a specialised form of thrust bearing used in ships, to resist the thrust of the propeller shaft and transmit it to the hull. Early screw-propelled steamships used a thrust block or thrust box composed of perhaps a dozen lower-rated plain thrust journal bearings stacked on ... Read »


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    • Trolling motor

    • A trolling motor is a self-contained unit that includes an electric motor, propeller and controls, and is affixed to an angler's boat, either at the bow or stern. A gasoline-powered outboard used in trolling, if it is not the vessel's primary source of propulsion, may also be referred to as a trolling motor. Trolling m ... Read »


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    • Turbine-electric transmission

    • A turbine-electric transmission system includes a turboshaft gas turbine connected to an electrical generator, creating electricity that powers electric traction motors. No clutch is required. Turbine-electric transmissions are used to drive both railway locomotives (rarely) and warships. A handful of experimental lo ... Read »


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    • Turbo-electric transmission

    • Turbo-electric transmission uses electric generators to convert the mechanical energy of a turbine (steam or gas) into electric energy and electric motors to convert it back into mechanical energy to power the driveshafts. Turbo-electric drives are used in some rail locomotives (gas turbines, e.g. with the first TGV) ... Read »


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    • Turbosail

    • The turbosail is a naval propulsion system based on an application of the Magnus effect. First attempted by Anton Flettner on the Buckau, it was later developed by Jacques-Yves Cousteau who commissioned the Alcyone, and designed the Calypso II. In 1980, Jacques Cousteau dreamed of creating a ship with a modern eng ... Read »


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    • V-drive

    • V-drive is a propulsion system for boats that consists of two drive shafts, a gearbox, and a propeller. In a "V-drive" boat, the engine is mounted in the rear of the boat and the front of the engine faces aft. Connected to the rear of the engine is the transmission. The first drive shaft connects the rear of the transm ... Read »


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    • Vandal (tanker)

    • Vandal (tanker)

      Vandal was a river tanker designed by Karl Hagelin and Johny Johnson for Branobel. Russian Vandal and French Petite-Pierre, launched in 1903, were the world's first diesel-powered ships (sources disagree over which of the two, Vandal or Petite-Pierre, was the first). Vandal was the first equipped with fully functional ... Read »


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    • Wind assisted propulsion

    • Wind assisted propulsion is the practice of decreasing the fuel consumption of a merchant vessel through the use of sails or some other wind capture device. Sails used to be the primary means of propelling ships, but with the advent of the steam engine and the diesel engine, sails came to be used for recreational saili ... Read »


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    • Windmill ship

    • A windmill ship, wind energy conversion system ship or wind energy harvester ship propels itself by use of a windmill to drive a propeller. They use wind power through a mechanical or electrical transmission to the propeller. Where transmission is electric, storage batteries may also be used to allow power generated a ... Read »


      Wikipedia
    • Wingsail

    • A wingsail is a variable-camber aerodynamic structure that is fitted to a marine vessel in place of conventional sails. Wingsails are analogous to airplane wings, except that they are designed to provide lift on either side to accommodate being on either tack. Whereas wings adjust camber with flaps, wingsails adjust ca ... Read »


      Wikipedia
    • Z-drive

    • A Z-drive is a type of marine propulsion unit. Specifically, it is an azimuth thruster. The pod can rotate 360 degrees allowing for rapid changes in thrust direction and thus vessel direction. This eliminates the need for a conventional rudder. The Z-drive is so named because of the appearance (in cross section) of th ... Read »


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    Wikipedia
  • What Else?

    • Marine propulsion

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