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Hickman Sea Sled
The Hickman Sea Sled is an inverted vee planing hull invented by Albert Hickman. The Sea Sled is a direct forerunner of the modern high speed catamaran or tunnel hull. The reduced friction is due to a "trapped" gas film between the hull surface and water. A similar effect is seen in super-cavitating torpedoes where a gas generator creates a film separation to water friction. "A new type of vessel, which promises to revolutionize water craft and which takes the same place on the water that the automobile does on land" - ''Scientific American'' 26 September 1914 See also * Cathedral hull * Boston Whaler Boston Whaler is an American boat manufacturer. It is a subsidiary of the Brunswick Boat Group, a division of the Brunswick Corporation. Boston Whalers were originally produced in Massachusetts, hence the name, but today are manufactured in Edge ... * Supercavitation propeller References * Campbell, Lorne''Innovation in Small Craft Design - A Tribute'' The Royal Institute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Sled, Broadside View, San Diego, California
The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, as well as certain large, entirely landlocked, saltwater lakes, such as the Caspian Sea. The sea moderates Earth's climate and has important roles in the water, carbon, and nitrogen cycles. Humans harnessing and studying the sea have been recorded since ancient times, and evidenced well into prehistory, while its modern scientific study is called oceanography. The most abundant solid dissolved in seawater is sodium chloride. The water also contains salts of magnesium, calcium, potassium, and mercury, amongst many other elements, some in minute concentrations. Salinity varies widely, being lower near the surface and the mouths of large rivers and higher in the depths of the ocean; however, the relative proportions of dissolved salts vary li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catamaran
A Formula 16 beachable catamaran Powered catamaran passenger ferry at Salem, Massachusetts, United States A catamaran () (informally, a "cat") is a multi-hulled watercraft featuring two parallel hulls of equal size. It is a geometry-stabilized craft, deriving its stability from its wide beam, rather than from a ballasted keel as with a monohull boat. Catamarans typically have less hull volume, smaller displacement, and shallower draft (draught) than monohulls of comparable length. The two hulls combined also often have a smaller hydrodynamic resistance than comparable monohulls, requiring less propulsive power from either sails or motors. The catamaran's wider stance on the water can reduce both heeling and wave-induced motion, as compared with a monohull, and can give reduced wakes. Catamarans were invented by the Austronesian peoples which enabled their expansion to the islands of the Indian and Pacific Oceans. Catamarans range in size from small sailing or rowing ve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunnel Hull
A tunnel hull is a type of boat hull that uses two typically planing hulls with a solid centre that traps air. This entrapment then creates aerodynamic lift in addition to the planing (hydrodynamic) lift from the hulls. Many times this is attributed to ground effect. Theoretical research and full-scale testing of tunnel hulls has demonstrated the dramatic contributions of 'close-proximity ground effect' on enhanced aerodynamic lift/drag in operation of performance tunnel hull designs."Secrets of Tunnel Boat Design", JDRussell,P.Eng. () Tunnel hulls are distinguishable from other catamarans by the typical close hull spacing and solid deck in between the hulls. Formula 1 powerboats have a tunnel hull catamaran design allowing them to go faster. Tunnel hulls are a common design in offshore powerboat racing. References See also * Cathedral hull * Hickman sea sled * Boston Whaler * Supercavitation propeller * Offshore Powerboat Racing Offshore powerboat racing is a type of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientific American
''Scientific American'', informally abbreviated ''SciAm'' or sometimes ''SA'', is an American popular science magazine. Many famous scientists, including Albert Einstein and Nikola Tesla, have contributed articles to it. In print since 1845, it is the oldest continuously published magazine in the United States. ''Scientific American'' is owned by Springer Nature, which in turn is a subsidiary of Holtzbrinck Publishing Group. History ''Scientific American'' was founded by inventor and publisher Rufus Porter (painter), Rufus Porter in 1845 as a four-page weekly newspaper. The first issue of the large format newspaper was released August 28, 1845. Throughout its early years, much emphasis was placed on reports of what was going on at the United States Patent and Trademark Office, U.S. Patent Office. It also reported on a broad range of inventions including perpetual motion machines, an 1860 device for buoying vessels by Abraham Lincoln, and the universal joint which now can be found ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cathedral Hull
A cathedral hull is a hull shape used in modern boats, usually power-driven. It has sponsons which extend almost as far forward as the main hull. The airspace between the hulls may be very small or nonexistent. Depending on the proportions of the sponsons and the depth of the main hull, the cathedral hull can approach the handling characteristics of either the Hickman sea sled, or the vee hull. The naval architect first credited with the successful use of the deep-vee hull form, C. Raymond Hunt, was involved in the design of the original 13’ Boston Whaler. It is cathedral hulled forward, but nearly a flat-bottomed scow at the stern. The term "cathedral hull" refers to the resemblance of a section through an inverted boat to that of a medieval cathedral. Characteristics The cathedral hull configuration tends to result in a very broad bow; many such boats are completely rectangular. This provides the maximum cargo or working space for a given length and beam. The hull shape ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boston Whaler
Boston Whaler is an American boat manufacturer. It is a subsidiary of the Brunswick Boat Group, a division of the Brunswick Corporation. Boston Whalers were originally produced in Massachusetts, hence the name, but today are manufactured in Edgewater, Florida. History Richard "Dick" Fisher graduated from Harvard University in 1936. He ran a company building small, lightweight boats out of balsa wood. He designed a rowboat and got the materials to build it, but he never completed it. In the 1950s, polyurethane foam, a stiff, lightweight, buoyant material, was invented. Fisher imagined it as a replacement for the lightweight balsa used in small boat construction, and in 1954 he constructed a small sailing dinghy filled with the foam, with a design similar to the Sunfish. He showed the finished product to his friend, naval architect C. Raymond Hunt. Hunt recognized potential in the process, however he did not feel the design was particularly suited to sailboats. Instead, he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supercavitation Propeller
{{no footnotes, date=November 2016 The supercavitating propeller is a variant of a propeller for propulsion in water, where supercavitation is actively employed to gain increased speed by reducing friction. They are being used for military purposes and for high performance racing boats as well as model racing boats. This article distinguishes a supercavitating propeller from a subcavitating propeller running under supercavitating conditions. In general, subcavitating propellers become less efficient when they are running under supercavitating conditions. The supercavitating propeller operates submerged with the entire diameter of the blade below the water line. Its blades are wedge-shaped to force cavitation at the leading edge and to avoid water skin friction along the whole forward face. As the cavity collapses well behind the blade, the supercavitating propeller avoids the spalling damage due to cavitation that is a problem with conventional propellers. An alternative to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
