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Topic: Water jet propulsion

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Personal water craft

Propulsion method

Jetboat

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	Water jet propulsion unit with retractable rudder - Patent 6428372
		The water jet propulsion unit is then installed outside the hull in a position such that the inlet of the water jet propulsion unit is in flow communication with the duct outlet at the transom.
		In a typical water jet propulsion unit, the impeller housing 50 is in flow communication with a thrust nozzle 52 having a decreasing cross-sectional area to increase the velocity of the impelled water passing therethrough.
		The steering nozzle 52 is pivotably mounted to the housing 52 of the water jet propulsion unit, with a generally vertical pivot axis defined by the centerlines of a pair of pivot pin assemblies 56.
	www.freepatentsonline.com /6428372.html (5482 words)

	Jet Propulsion - MSN Encarta
		In such a system, water is inducted at the forward end of the ship, passed through high-pressure pumps, and then exhausted at the stern through one or more nozzles that produce high-speed water jets.
		Jet power as a form of propulsion has been known for hundreds of years, although its use for propelling vehicles that carry loads is comparatively recent.
		The continuous development of jet propulsion for air power has resulted in such advances as piloted aircraft capable of attaining speeds several times greater than the speed of sound, and intercontinental ballistic missiles and artificial satellites launched by powerful rockets.
	uk.encarta.msn.com /encyclopedia_761572024_2/Jet_Propulsion.html (1325 words)

	Jetboat - Wikipedia, the free encyclopedia
		Unlike a powerboat or motorboat that uses a propeller in the water behind the boat, a jetboat draws the water from under the boat into a pump-jet inside the boat, then expels it through a nozzle at the stern.
		Jet boats are highly maneuverable and can often be reversed and brought to a stop within their own length from full speed in a maneuver known as a Hamilton turn.
		A conventional screw propeller accelerates a large volume of water by a small amount, in a manner similar to the way an aeroplane's propeller accelerates a large volume of air by a small amount.
	en.wikipedia.org /wiki/Jetboat (761 words)

	Ship Technology - Water Jet Propulsion
		In a similar way to an aeroplane jet engine, the marine jet propulsion drive draws water in through a cavity (usually located in the base near the rear of the craft) using what is termed an impeller where a mesh is used to stop large objects from being sucked up.
		Water is expelled at 15 degrees through outlet nozzles in the water jet propulsion engine.
		The force (and therefore the acceleration) experienced by the boat is determined by the mass of water the drive can impel in a given time period, and the velocity of the mass of water on exiting the water jet propulsion system.
	www.ship-technology.com /contractors/propulsion/waterjet.html (436 words)

	Twin Disc Propulsion - Marine JETS - Features and benefits
		The theory of water jet propulsion was subsequently investigated and discussed by Frenchman Daniel Bernoulli in 1753.
		A jet of water is expelled from the rear of the boat.
		Water jet systems are generally regarded as non conventional, used in high speed application (+25 Knots), but the fact of the matter is that, if correctly selected and installed, they can and do provide a visible alternative to the conventional propeller and can achieve overall efficiencies that are better than conventional propellers.
	www.twindiscpropulsion.com /it/JETFeatures.htm (480 words)

	Pump-jet - Wikipedia, the free encyclopedia
		A pump-jet or water jet is a marine system that creates a jet of water for propulsion.
		The mechanical arrangement may be a ducted propeller with nozzle, or a centrifugal pump and nozzle.
		Pump jets have some advantages over bare propellers for certain applications, usually related to requirements for high-speed or shallow-draft operations.
	en.wikipedia.org /wiki/Pump-jet (215 words)

	Water and rivers (Site not responding. Last check: 2007-10-31)
		In this turbine, the water is piped from a high-level reservoir through a long duct, or penstock, to a nozzle where its energy is converted into the kinetic energy of a high-speed jet.
		A sheet of water is allowed to advance from ditches and remain on a field for a given period, depending on the crop, the porosity of the soil, and its drainage.
		However, because the water that evaporates from the ocean is almost free of salt, the rain and snow that fall on the earth are relatively fresh.
	www.brecknock.camden.sch.uk /water_and_rivers.htm (10154 words)

	Water jet propulsion system - Patent 4541808
		Accordingly the invention has as its object the provision of a water jet propulsion system for watercraft which eliminates the aforesaid difficulties with which the prior art is faced with and enables the operation of mounting an impeller on the drive shaft with respect to the duct to be carried out relatively readily and positively.
		In the water jet propulsion system according to the invention, the drive shaft and the transmission shaft constitute a transmission mechanism and the two shafts are joined to each other by connection means.
		This allows a pump portion of the water jet propulsion system to be assembled outside the watercraft and separately therefrom, so that positioning of the impeller with respect to the duct can be effected with a high degree of accracy.
	www.freepatentsonline.com /4541808.html (1711 words)

	Jet Propulsion Laboratory: Planets
		Liquid water is a necessity for every form of life known, with the possible exception of some plants or fungi that may get by on water vapor.
		Water in its various forms pervades the solar system, from traces of water vapor on the Sun itself to water ice in the likely composition of Pluto and the Kuiper Belt objects beyond it.
		Even without its link to the question of extraterrestrial life, water would be an important theme in exploration of the solar system, as a possible resource and as a substance that's geologically intriguing in its own right.
	www.jpl.nasa.gov /solar_system/water/water_index.html (339 words)

	Marine propulsion patents 200603
		The water jet propeller includes a stator disposed at a rear-end portion of an impeller housing, and an impeller is disposed inside the impeller housing.
		20060057908 - Water jet propulsion watercraft: A water jet propulsion watercraft that allows accurate speed detection of a speed detection unit to be achieved.
		The propulsion unit can have a propeller for producing thrust, a power device for driving the propeller, and a power transmission mechanism for transmitting power from the power device to...
	www.freshpatents.com /Marine-propulsion-dt200603ntc440.php (739 words)

	Cephalopod Jet Propulsion
		Jet propulsion is the typical method of swimming fast in cephalopods.
		During jet propulsion, water is taken into the mantle cavity by expansion of the mantle.
		Water enters laterally at the sides of the head, passes over the collar, over the gills and leaves through the funnel when the mantle contracts.
	tolweb.org /accessory/Cephalopod_Jet_Propulsion?acc_id=2060 (381 words)

	Water Jet Propulsion System at Water jet (Site not responding. Last check: 2007-10-31)
		Instead of water, however, the moisture consists of liquid methane, a compound...
		The Water-jet Propulsion System has been developed for the DIEE, Cagliari University, and is intended as a test bed for advanced high-precision position-control techniques for underwater...
		The Jet Propulsion Laboratory is the lead U.S. center for robotic exploration of the solar system.
	www.kamagra-store.com /water-jet/water-jet-propulsion-system.php (598 words)

	Sprint Jet Boats (Site not responding. Last check: 2007-10-31)
		Sprint boat racing or jet sprinting is a sport that started in New Zealand in the 1980's.
		Jet Sprint Boat racing is a form of racing sport where trailerable speed boats, powered by water jet propulsion rather...
		Dave's claim to fame is his fibreglass hulled Jet Boats which have scored third in the 1998 World Series...
	www.1st-at-boats.com /boats-63/sprint-jet-boats.html (645 words)

	Your complete boats guide - jet boat racing (Site not responding. Last check: 2007-10-31)
		Jet Sprint Boat racing is a form of racing sport where trailerable speed boats, powered by water jet...
		Jet Sprint Boat racing is a form of racing sport where trailerable speed boats, powered by water jet propulsion rather than by conventional
		Jet sprint boat racing Jet Sprint Boat racing is a form of racing sport where trailerable speed boats, powered by water jet propulsion rather...
	www.completeboats.info /jet-boat-racing (880 words)

	water jet propulsion controls latest news and developments. (Site not responding. Last check: 2007-10-31)
		WCM Controls can deliver propulsion control systems for any kind of water jet units TESS is the only fully customizable electric steering system for vessels using water jet propulsion.
		Jet boats are normally powered by a Categories Boat types Marine propulsion.
		In jet Propulsion, thrust can be increased by injecting water at the compressor inlet and allowing the evaporating water to cool the air.
	waterjet.infopeak123.info /water-jet-propulsion-controls (666 words)

	Engineering Heritage
		First built at his Irishmans Creek workshop for boating on Canterbury’s shingle rivers in the 1950s, Sir William (C.W.F.) Hamilton’s development of the water jet propulsion unit was innovative in both design and manufacture and the Hamilton Jet is acknowledged as a world leader in its field.
		The first jet boat ran successfully upriver in 1953 and since then, the Hamilton Jet has enjoyed a high profile, both in New Zealand and overseas.
		Jet efficiencies were improved to be comparable with conventional propellers up to 25 knots and more efficient at boat speeds higher than that.
	www.ipenz.org.nz /heritage/itemdetail.cfm?itemid=49 (294 words)

	Untitled Normal Page
		It is also a remarkable coincidence that David Stogdon MBE, who was District Inspector of lifeboats for the RNLI in the 1950s and 60s, covering the Caister station, later carried out the development of water jet propulsion for the RNLI finally completing the work with the Dutch KNRM, hence the Valentijn 2000 vessel.
		This day is the culmination of David's vision to see a water jet propelled offshore lifeboat on station in the United Kingdom.
		It is capable of negotiating both shallow water conditions like the ones present on the offshore banks directly off Caister and the treacherous seas common to this part of the Norfolk coast.
	www.rjt.co.uk /caister_lifeboat/homeco.htm (388 words)

	water-jet propulsion system (Site not responding. Last check: 2007-10-31)
		The Water-jet Propulsion System has been developed for the DIEE, Cagliari University, and is intended as a test bed for advanced high-precision position-control techniques for underwater robotic vehicles.
		The first prototype (here under trial in the water channel) has a 2-nozzle configuration, where the final version will use 7 nozzles to allow the control of all the 6-DOF of an underwater vehicle.
		To allow very high-speed control of the jet intensity, the spear valve is actuated by a directly-coupled linear electric motor.
	www.vincenzoarrichiello.com /en/jetprop.html (115 words)

	Hamilton Jet - Pioneers of Waterjet Propulsion (Site not responding. Last check: 2007-10-31)
		In 1954, on a shallow fast flowing river in the back country of the South Island of New Zealand, a small boat overcame the forces of nature to travel upstream against the current.
		The boat was a Hamilton Jetboat, and is recognised as the genesis of the modern waterjet propulsion system.
		Today, waterjets are the preferred propulsion choice for a wide range of work and patrol vessels, and pleasure craft where high efficiency, outstanding manoeuvrability, shallow draft capability and low maintenance are key requirements.
	www.hamjet.co.nz /files/TradeNZExportAwardsHamiltonJet.htm (169 words)

	Using CFD to design water-jet inlets. \| Business (Site not responding. Last check: 2007-10-31)
		In the water, the hull design, called a planing brick because of its weight and shape, requires a large amount of power to achieve planing speeds.
		The craft is powered by a diesel engine with more than 2,000 horsepower that drives a water-jet propulsion system for water use and a high-mobility track-laying suspension system on land.
		A water-jet-propelled vessel such as the AAAV takes in water through inlets in the hull, feeds it into pumps, and expels the water at high speed through nozzles at the rear of the vessel.
	www.allbusiness.com /periodicals/article/647311-1.html (709 words)

	Jet sprint boat racing - Encyclopedia, History, Geography and Biography
		Jet sprint boat racing - Encyclopedia, History, Geography and Biography
		This encyclopedia, history, geography and biography article about Jet sprint boat racing contains research on
		Jet sprint boat racing, See also and Motorboat racing.
	www.arikah.com /encyclopedia/Jet_sprint_boat_racing (128 words)

	2evolchp16
		To raise the antennae, a small amount of water is pumped from his body into the pad, which increases its size by 25 percent, causing it to unfold— and lift the antennae!
		The female lays eggs which she quickly buries in small holes on that part of the sandy beach washed by the highest of the high tides.
		First, it shoots the beetle away from the danger, and, second, at the same time, the detergent weakens water surface tension and the creature chasing the beetle sinks in the water.
	www.evolution-facts.org /Ev-V2/2evlch16.htm (14556 words)

	AMGS - Hamilton Jet Drives
		Atlantis Marine Gear Supply is the American Northeast's distributor of the most advanced waterjet propulsion system in the world: Hamilton Jet.
		Hamilton Jet is the world leader in water jet propulsion sales and water jet technology.
		From providing accurate and realistic performance analysis before a boat is built, to fast and efficient yearly maintenance, to onsite training of local technical staff.
	www.hamiltonjetdrives.com (72 words)

	Castoldi water jet propulsion systems (Site not responding. Last check: 2007-10-31)
		Italian Castoldi water jet propulsion systems have gathered excellent experiences around the world for decades.
		The Castoldi Jet of P/V Sarakallio has worked in an excellent way during the years and we are highly satisfied with the performance and reliability of Castoldi.
		In Finland, Estonia, Russia and countries nearby Castoldi Jets are represented by Ulkoiluaitta Oy Meredin.
	personal.inet.fi /yhdistys/meripelastus/castold2.html (344 words)

	water jet tool (Site not responding. Last check: 2007-10-31)
		Welcome to the water jet tool resource section of our website.
		Please feel free to search and to navigate through our categories to find information on water jet tool and related topics.
		We also have the top news headlines about water jet tool.
	www.blogsearchonline.com /resources/jets/water_jet_tool.html (108 words)

	U.S. Pregrant 20040168838 - Water jet reversing propulsion and directional controls for automated swimming pool cleaners (Site not responding. Last check: 2007-10-31)
		Water jet reversing propulsion and directional controls for automated swimming pool cleaners
		The direction of the discharge of the propelling water jet is changed by mechanical sensors, electrical sensors, or by interrupting the water pump.
		Further variations in the direction of translational movement of the cleaner are effected by activating at least one retractable depending member to periodically contact the pool surface below the moving cleaner, thereby causing the cleaner to pivot or otherwise change direction.
	cxp.paterra.com /uspregrant20040168838.html (159 words)

	water jet massage (Site not responding. Last check: 2007-10-31)
		Welcome to the water jet massage resource section of our website.
		cruiser jet kawasaki ski sport, unleashed jet lee, kawasaki jet ski 300, jets dolphins ticket, private jet uk, jet blue airline flight information, west jet seat sale, hamilton water jets, 16c d f fighter jet, aircraft or airline or plane or warplane or jet or helicopter, jet blue web site,
		Please feel free to search and to navigate through our categories to find information on water jet massage and related topics.
	www.blogsearchonline.com /resources/Jet/water_jet_massage.html (119 words)

	Using CFD to design water-jet inlets
		The U.S. Marines' new landing craft, the Advanced Amphibious Assault Vehicle, is powered by a diesel engine that drives a water-jet propulsion system for water use and a track-laying suspension system on land.
		The vessel takes in water through inlets in the hull, feeds it into pumps, and expels it at high speed.
		An important design feature is the lip that separates flow going into the inlet from flow going past it.
	www.memagazine.org /backissues/may97/features/waterjet/waterjet.html (404 words)

	Gas turbine/Water jet propulsion - Boat Design Forums
		I am trying to locate on the Web sites that will help me understand Marine Gas Turbines for small Craft (40/50 feet) and Water Jet propulsion systems, ideally if this combination has ever been designed and implemented.
		Any of you chaps got any good Web sites you can point me at or even tell me what I am considering is unfeasible.
		Almost bought prop boat/found jet propulsion may be better
	www.boatdesign.net /forum/showthread.php?t=3594 (200 words)

	Hayward Viper In-Ground Pool Cleaner \| The Brown Box
		This viper comes with 41% wider vacuum nozzle, a large 6-quart debris bag and highly effective sweep 32 feet of hose; it makes quick work of the most difficult debris.
		And with programmable AquaDrive™ water jet propulsion won't harm the pool surface as power driven wheels can spends less time backing up and eliminates wear on the pool surface.
		Programmable AquaDrive water jet propulsion system maximizes cleaning time
	www.shopbrownbox.com /catalog/shop/Hayward_Viper_In_Ground_Pool_Cleaner (356 words)

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