Screws
Marine propellers are also known as "screws". There are many variations of marine screw systems, including twin, contra-rotating, controllable-pitch, and nozzle-style screws. While smaller vessels tend to have a single screw, even very large ships such as tankers, container ships and bulk carriers may have single screws for reasons of fuel efficiency. 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 or may not be connected to a gearbox.
Read more about this topic: Marine Propulsion
Famous quotes containing the word screws:
“Each of us is full of too many wheels, screws and valves to permit us to judge one another on a first impression or by two or three external signs.”
—Anton Pavlovich Chekhov (1860–1904)