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Evinrude Outboard Motors was a North American company that built a major brand of two-stroke outboard motors for boats. Founded by Ole Evinrude in Milwaukee , Wisconsin in 1907, it was formerly owned by the publicly traded Outboard Marine Corporation (OMC) since 1935 but OMC filed for bankruptcy in 2000.
Ole Evinrude formed Evinrude Outboard Motors, which he sold in 1913 in order to look after his sick wife. In 1919, Evinrude invented a more efficient and lighter two-cylinder motor. Having sold his part in Clemick & Evinrude, he founded ELTO or the Elto Outboard Motor Company. (ELTO was an acronym for "Evinrude Light Twin Outboard".)
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 motorised method of propelling small watercraft.
A chopper is a propeller design largely of interest for production outboards on fast pad v-bottom boats. Unlike a cleaver the chopper's trailing edge extends aft with a large chord line at each radius.
Other vessels may have twin, triple or quadruple screws. Power is transmitted from the engine to the screw by way of a propeller shaft, which may be connected to a gearbox. The propeller then moves the vessel by creating thrust. When the propeller rotates the pressure in front of the propeller is lower than the pressure behind the propeller.
A screw turning through a solid will have zero "slip"; but as a propeller screw operates in a fluid (either air or water), there will be some losses. The most efficient propellers are large-diameter, slow-turning screws, such as on large ships; the least efficient are small-diameter and fast-turning (such as on an outboard motor).
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