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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 .
Unlike inboard motors, outboard motors can be easily removed for storage or repairs. Bolinder's two-cylinder Trim outboard engine A Mercury Marine 50 hp outboard engine, circa 1980 to 1983 1979 Evinrude 70 hp outboard, cowling and air silencer removed, exposing its shift/throttle/spark advance linkages, flywheel, and three carburetors
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.
Inboard-Outboard (or stern drives) are a hybrid, with an engine block mounted within the hull linked to a pivotable lower drive unit which steers the craft, similar to an outboard motor. Jet Drives have a propeller enclosed in a pump-jet that draws water from underneath the hull and expels it through a swiveling nozzle in the stern.
A motorboat with an outboard motor. A motorboat or powerboat is a boat that is exclusively powered by an engine; faster examples may be called "speedboats".. Some motorboats are fitted with inboard engines, others have an outboard motor installed on the rear, containing the internal combustion engine, the gearbox and the propeller in one portable unit.
Straight-twin engines have been often used as inboard motors, outboard motors and jet pump motors. [53] In the early 20th century, gaff-rigged British fishing boats such as Morecambe Bay PrawnersLancashire Nobbys would sometimes retrofit an inboard engine, such as the Lister or the Kelvin E2 3.0 litre petrol-paraffin engine.
Inboard: attached inside the ship. [14] Keel: the bottom structure of a ship's hull. [15] Leeward: side or direction away from the wind (opposite of "windward"). [16] On deck: to an outside or muster deck (as "all hands on deck"). [17] On board: on, onto, or within the ship [18] Onboard: somewhere on or in the ship. [19] Outboard: attached ...
The difference between a saildrive and a Z-drive is that a saildrive's propeller shaft is fixed in place, pointing aft, whereas a Z-drive's propeller shaft can be rotated to any azimuth. Traditional sailboat transmissions consist of a simple horizontal output shaft extended rearward from the engine, through the stern via a stuffing box .