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Large ships, boats and yachts will inevitably have inboard engines. Medium size vessels may have either inboards or outboards, and small vessels rarely have inboard motors. If one has a choice, these factors should be noted: Inboard engines are almost invariable diesel, allowing ruggedness, reliability and fuel economy.
The outdrive unit of a boat with sterndrive. A sterndrive or inboard/outboard drive (I/O) is a form of marine propulsion which combines inboard power with outboard drive. The engine sits just forward of the transom while the drive unit (outdrive or drive leg) lies outside the hull.
Some very long stroke engines have a maximum speed of around 80 rpm. The largest, most powerful engines in the world are slow speed, two stroke, crosshead diesels. Medium speed: any engine with a maximum operating speed in the range 300–1000 rpm. Many modern four-stroke medium speed diesel engines have a maximum operating speed of around 500 rpm.
Mercury outboards 30 hp and below are manufactured by Tohatsu in Japan. [citation needed] Mercury developed a processor-enhanced line of outboards called the "Verado" outboard engine. [when?] [5] The "Verado" system integrates the outboard into an entire system, including "fly-by-wire" steering and advanced diagnostics. Verado engines are ...
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.
Grand Prix (GP) is a class of boats featuring supercharged big-block V8 piston engines producing as much as 1,500 horsepower. The 23- to 26-foot craft are fast—routinely attaining speeds in excess of 170 miles per hour (273.5 km/h) in the straights. This class of boat races in the United States, Canada, Australia and New Zealand.
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Hull speed or displacement speed is the speed at which the wavelength of a vessel's bow wave is equal to the waterline length of the vessel. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well. When hull speed is exceeded, a vessel in displacement mode ...