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In addition the housing had a redesigned lower anti-cavitation plate, protruding forward upper spray plate, a rear-mounted steering bar design, and finally, an exhaust opening above the water surface that reduced exhaust back pressure while increasing noise levels when the boat was on plane.
The outdrive resembles the bottom half of an outboard motor and is composed of two sub-units: an upper containing a driveshaft connected through the transom to an engine which transmits power to a 90-degree-angle gearbox; and the lower containing a vertical driveshaft receiving power from the upper unit gearbox, transmitted through another 90 ...
The first known outboard motor was a small 11 pound (5 kg) electric unit designed around 1870 by Gustave Trouvé, [9] and patented in May 1880 (Patent N° 136,560). [10] Later about 25 petrol powered outboards may have been produced in 1896 by American Motors Co [9] —but neither of these two pioneering efforts appear to have had much impact.
Cat-back exhaust systems generally use pipes of larger diameters than the stock system. To reduce backpressure, the mufflers included in these kits are often glasspacks. If the system is engineered more for show than functionality, it may be tuned to enhance the lower sounds from high-RPM low-displacement engines.
Small boats with outboard engines and personal water crafts (PWC) tend to ingest water simply because they run in and around it. During a rollover, or when a wave washes over the craft, its engine can hydrolock, though severe damage is rare due to the special air intakes and low rotating inertia of small marine engines.
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Cross section of a vessel with a single ballast tank at the bottom. A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural ...
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