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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 nozzle at the stern. The modern jetboat was developed by New Zealand engineer Sir William Hamilton in the mid-1950s. His goal was a boat to run up the fast-flowing rivers of New Zealand that were too shallow for propellers. Previous attempts at waterjet propulsion had very short lifetimes, generally due to the inefficient design of the units and the fact that they offered few advantages over conventional propellers. Unlike these previous waterjet developments, such as Campini's and the Hanley Hydrojet, Hamilton had a specific need for a propulsion system to operate in very shallow water, and the waterjet proved to be the ideal solution. The popularity of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Queenstown, New Zealand
Queenstown ( mi, Tāhuna) is a resort town in Otago in the south-west of New Zealand's South Island. It has an urban population of The town is built around an inlet called Queenstown Bay on Lake Wakatipu, a long, thin, Z-shaped lake formed by glacial processes, and has views of nearby mountains such as The Remarkables, Cecil Peak, Walter Peak and just above the town, Ben Lomond and Queenstown Hill. The Queenstown-Lakes District has a land area of not counting its inland lakes Hāwea, Wakatipu, and Wānaka. The region has an estimated resident population of Neighbouring towns include Arrowtown, Glenorchy, Kingston, Wānaka, Alexandra, and Cromwell. The nearest cities are Dunedin and Invercargill. Queenstown is known for its commerce-oriented tourism, especially adventure and ski tourism. History Māori settlement and presence The area was discovered and first settled by Māori. Kāi Tahu say that the lake was dug by the Waitaha ancestor, Rākaihautū, wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pump-jet
A pump-jet, hydrojet, or water jet is a marine system that produces 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 provide water to the pump and a nozzle to direct the flow of water out of the pump.http://www.hamiltonmarine.co.nz/includes/files_cms/file/JetTorque%2008.pdf Design A pump-jet works by having an intake (usually at the bottom of the hull) that allows water to pass underneath the vessel into the engines. Water enters the pump through this inlet. The pump can be of a centrifugal design for high speeds, or an axial flow pump for low to medium speeds. The water pressure inside the inlet is increased by the pump and forced backwards through a nozzle. With the use of a ''reversing bucket'', reverse thrust can also be achieved for faring backwards, quickly and with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bill Hamilton (engineer)
Sir Charles William Feilden Hamilton (26 July 1899 – 30 March 1978) was a New Zealand engineer who developed the modern jetboat, and founded the water jet manufacturing company, CWF Hamilton Ltd. Hamilton never claimed to have invented the jet boat. He once said "I do not claim to have invented marine jet propulsion. The honour belongs to a gentleman named Archimedes, who lived some years ago." What he did was refine the design enough to produce the first useful modern jet boat. Early life Hamilton was born at Ashwick Station near Fairlie, New Zealand. Hamilton survived an airplane accident returning to Rongotai Airport (Wellington) in poor conditions on 19 February 1936. The collision with the anemometer mast took the starboard wing off the fastest 'plane in the country, the Miles Falcon Six he was travelling in, and pilot Malcolm "Mac" McGregor died in hospital. At the age of 21 he bought the 'Irishman Creek' sheep station in South Canterbury. After a trip to England b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 inland waterways such as rivers and lakes, or in protected coastal areas. However, some boats, such as the whaleboat, were intended for use in an offshore environment. In modern naval terms, a boat is a vessel small enough to be carried aboard a ship. Boats vary in proportion and construction methods with their intended purpose, available materials, or local traditions. Canoes have been used since prehistoric times and remain in use throughout the world for transportation, fishing, and sport. Fishing boats vary widely in style partly to match local conditions. Pleasure craft used in recreational boating include ski boats, pontoon boats, and sailboats. House boats may be used for vacationing or long-term residence. Lighters are use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transom (nautical)
A transom is the vertical reinforcement which strengthens the stern of a boat. This flat termination of the stern is typically above the waterline. The term was used as far back as Middle English in the 1300s, having come from Latin ''transversus'' (transverse) via Old French ''traversain'' (set crosswise). The stern of a boat is typically vertical. It can be raked such that there is an overhang above the water, as at the bow. A reverse transom is angled from the waterline forwards. Transoms can be used to support a rudder, outboard motor, or as a swimming and access platform. Gallery File:The Bermuda cedar (Juniperus bermudiana) transom of Spirit of Bermuda, 2016.jpg, The Bermuda cedar transom of the Spirit of Bermuda File:Sea Scooter transom.jpg, Flat transom on a dinghy with mount points for a rudder. File:Coble on shore at Boulmer (2) - geograph.org.uk - 1381157.jpg, Raked transom with rudder mount points. File:CS 30 Sailboat Kelsea 0297.jpg, Reverse transom with rudde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isaac Newton
Sir Isaac Newton (25 December 1642 – 20 March 1726/27) was an English mathematician, physicist, astronomer, alchemist, theologian, and author (described in his time as a " natural philosopher"), widely recognised as one of the greatest mathematicians and physicists and among the most influential scientists of all time. He was a key figure in the philosophical revolution known as the Enlightenment. His book (''Mathematical Principles of Natural Philosophy''), first published in 1687, established classical mechanics. Newton also made seminal contributions to optics, and shares credit with German mathematician Gottfried Wilhelm Leibniz for developing infinitesimal calculus. In the , Newton formulated the laws of motion and universal gravitation that formed the dominant scientific viewpoint for centuries until it was superseded by the theory of relativity. Newton used his mathematical description of gravity to derive Kepler's laws of planetary motion, accoun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newton's Laws Of Motion
Newton's laws of motion are three basic laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it. These laws can be paraphrased as follows: # A body remains at rest, or in motion at a constant speed in a straight line, unless acted upon by a force. # When a body is acted upon by a force, the time rate of change of its momentum equals the force. # If two bodies exert forces on each other, these forces have the same magnitude but opposite directions. The three laws of motion were first stated by Isaac Newton in his ''Philosophiæ Naturalis Principia Mathematica'' (''Mathematical Principles of Natural Philosophy''), originally published in 1687. Newton used them to investigate and explain the motion of many physical objects and systems, which laid the foundation for classical mechanics. In the time since Newton, the conceptual content of classical physics has been reformulated in alternative ways, involving differ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Impeller
An impeller or impellor is a rotor used to increase the pressure and flow of a fluid. It is the opposite of a turbine, which extracts energy from, and reduces the pressure of, a flowing fluid. In pumps An impeller is a rotating component of a centrifugal pump that accelerates fluid outward from the center of rotation, thus transferring energy from the motor that drives the pump to the fluid being pumped. The velocity achieved by the impeller transfers into pressure when the outward movement of the fluid is confined by the pump casing. An impeller is usually a short cylinder with an open inlet (called an eye) to accept incoming fluid, vanes to push the fluid radially, and a splined, keyed, or threaded bore to accept a drive shaft. It can be cheaper to cast an impeller and its spindle as one piece, rather than separately. This combination is sometimes referred to simply as the "rotor." Types Open impellers An open impeller has a hub with attached vanes and is moun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stator
The stator is the stationary part of a rotary system, found in electric generators, electric motors, sirens, mud motors or biological rotors. Energy flows through a stator to or from the rotating component of the system. In an electric motor, the stator provides a magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current. In fluid powered devices, the stator guides the flow of fluid to or from the rotating part of the system. Design Motor stators are made either from iron/steel or from a printed circuit board (PCB). Originally applied to low-power applications, PCB stators can be lighter, smaller, and less noisy. One design embeds thin copper traces in the PCB stator that serve as the windings. The traces are interleaved with epoxy-glass laminates, that insulate each coil from its neighbors. An air core replaces the traditional iron core, saving space and weight, and allowing a smaller air gap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrofoil
A hydrofoil is a lifting surface, or foil, that operates in water. They are similar in appearance and purpose to aerofoils used by aeroplanes. Boats that use hydrofoil technology are also simply termed hydrofoils. As a hydrofoil craft gains speed, the hydrofoils lift the boat's hull out of the water, decreasing drag and allowing greater speeds. Description The hydrofoil usually consists of a winglike structure mounted on struts below the hull, or across the keels of a catamaran in a variety of boats (see illustration). As a hydrofoil-equipped watercraft increases in speed, the hydrofoil elements below the hull(s) develop enough lift to raise the hull out of the water, which greatly reduces hull drag. This provides a corresponding increase in speed and fuel efficiency. Wider adoption of hydrofoils is prevented by the increased complexity of building and maintaining them. Hydrofoils are generally prohibitively more expensive than conventional watercraft above a certain di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shotover Jet, Jet Boating The Shotover River Canyons, Queenstown, New Zealand
Shotover is a hill and forest in Oxfordshire, England. The hill is east of Oxford. Its highest point is above sea level. Early history The toponym may be derived from the Old English , meaning "steep slope". Shotover was part of the Wychwood royal forestSherwood & Pevsner, 1974, pp. 763–765 from around the period of the Domesday Book until 1660. It was also known as the Forest of Shotover. A hill figure is recorded as having once been carved on the hill. Antiquarian John Aubrey writes: :"On Shotover Hill ear Oxfordwas heretofore (not long before the Civil Wars, in the memory of man) the effigies of a Giant cut in the earth, as the White Horse by Ashbury Park" Shotover Road The road between London and Oxford used to pass over the top of Shotover Hill. The road was made into a turnpike under the 1719 Stokenchurch Turnpike Act. Shotover Park Shotover Park and garden were begun in about 1714 for James Tyrrell of Oakley. Tyrell died in 1718 and the house was completed by h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rogue Jetboat M D Vaden
A rogue is a person or entity that flouts accepted norms of behavior. Rogue or rogues may also refer to: Companies * Rogue Ales, a microbrewery in Newport, Oregon * Rogue Arts, a film production company * Rogue Entertainment, a software company * Rogue Films, a production company based in London * Rogue Fitness, a manufacturer and distributor of strength and conditioning equipment * Rogue Pictures, an American film production company * Rogue (esports), an American esports organization Arts, entertainment and media Comics * Rogue (Marvel Comics), a Marvel comics character * Rogues (comics), a villain team in the DC Comics universe * Rogue Trooper, a fictional character from the science fiction strip of the same name Film and television * ''The Rogue'', a 1918 American film starring Oliver Hardy * ''Rogue'' (2007 film), an Australian independent horror film * ''Rogue'' (2017 film), an Indian bilingual action thriller * ''Rogue'' (2020 film), an American action film st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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