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In 1988 Tohatsu and Brunswick Corporation set up a joint venture named Tohatsu Marine Corporation to produce outboards for Mercury Marine. [10] Some Mercury outboards with less than 60 HP are rebranded Tohatsus. [11] In 2011, Tohatsu and Evinrude Outboard Motors made a deal to make smaller engines ranging from 15 HP and down with Evinrude ...
Subsidiaries include Mercury Precision Parts and Accessories as well as Mercury propellers and Mercury Jet Drives. 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.
Basic parts of an outboard motor. 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.
Nissan outboard motors are produced by Tohatsu Corporation of Tokyo, Japan. They are the second largest producer of outboard motors in the world and produce environmentally conscious TLDI series of two-stroke low pressure direct injection outboards that meet current United States Environmental Protection Agency regulations for the US.
[clarification needed] The choice between using thrusters or traditional propellers to propel marine vessels is a compromise between versatility and efficiency. Propellers are designed to work in-line with a propulsion plant and produce one-directional thrust while thrusters are more customizable and have a more versatile application.
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.
The word is commonly used in the marine vernacular, and implies a mechanical assembly that is more complicated than a propeller. The Kort nozzle, pump-jet and rim-driven thruster are examples. An example propulsor is shown in the accompanying picture. It has a shroud which cuts down on blade-tip cavitation and radiated noise.
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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