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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.
A 260-horsepower (190 kW) diesel inboard motor An inboard motor is a marine propulsion system for boats.As opposed to an outboard motor, where an engine is mounted outside the hull of the craft, an inboard motor is an engine enclosed within the hull of the boat, usually connected to a propulsion screw by a driveshaft.
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V12 marine diesel engines . 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 warfares. The first advanced mechanical means of marine propulsion was the marine steam engine, introduced in the early 19th ...
Mercury Marine is a marine engine division of Brunswick Corporation headquartered in Fond du Lac, Wisconsin. The main product line is outboard motors. It also produces the MerCruiser line of sterndrives and inboard engines, as well as a lineup of electric outboard motors. Utilizing modular and portable 48V lithium-ion batteries and transverse ...
For sportboats, a V-drive may be an alternative to an inboard/outboard (I/O) drive. Here the V-drive will allow the engine to be moved further forwards and the propeller (& rudder) will be under the boat. This can give a flatter ride (getting the boat planing earlier), greater choice of propellers, and a safer stern access for swimmers.
Among the earliest representatives of the technology was the OMC Zephyr Saildrive, produced from 1977 to 1984. This was a two-stroke gasoline engine to which oil needed to be added on a 50:1 mixture. It was a derated version of the 32 cubic inch engine block used at that time on the OMC Evinrude 25/30/35 hp outboards.
Marine automobile engines are types of automobile petrol-or diesel engines that have been specifically modified for use in the marine environment. The differences include changes made for the operating in a marine environment, safety, performance, and for regulatory [1] requirements. The act of modifying is called 'marinisation'.