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Marine Engines
Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through 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 internal combustion engine driving a propeller, or less frequently, in pump-jets, an impeller. Marine engineering is the discipline concerned with the engineering design process of marine propulsion systems. Human-powered paddles and oars, and later, sails were the first forms of marine propulsion. Rowed galleys, some equipped with sail, played an important early role in early human seafaring and warfare. The first advanced mechanical means of marine propulsion was the marine steam engine, introduced in the early 19th century. During the 20th century it was replaced by two-stroke or four-stroke diesel engines, outboard motors, and gas turbine engines on faster ships. Marine nuclear reactors, which appeared in the 1950s, produ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RR Marine Spey RRHT Derby
RR, Rr or rr may refer to: Arts and entertainment * RR (film), ''RR'' (film), a 2007 experimental film by James Benning * Red Ribbon Army, a fictional army in the ''Dragon Ball'' series * Ruff Ryders Entertainment, a record label and East Coast rap collective * ''Fury from the Deep'' (production code: RR), a 1968 ''Doctor Who'' serial * RR (EP), ''RR'' (EP), a 2023 collaborative EP by Rosalía and Rauw Alejandro * RR, prefix for models of Jackson Rhoads electric guitars commissioned by guitarist Randy Rhoads Businesses and organizations * Rashtriya Rifles, an Indian counter-insurgency force * Rational Recovery, an addiction recovery program * Rekords Rekords (logo), an American record label * Rhodesia Regiment, Rhodesian Army unit * Royal Air Force (IATA airline designator) * Richard Rohac (logo), an Austrian art metal firm Language * rr (digraph) * Revised Romanization of Korean, the official Korean language romanization system in South Korea * Revised Romanization of Hangeul, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
