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Propulsion thrusters are those thrusters which provide longitudinal motion for vessels as an alternative to traditional propellers. There are a variety of types of propulsion thrusters but the most common form is the azimuth thruster, that can rotate 360 degrees on a vertical axis to optionally produce thrust for maneuvering. (Lindborg, 1997).
The Z-drive is so named because of the appearance (in cross section) of the mechanical driveshaft or transmission configuration used to connect the mechanically supplied driving energy to the Z-drive azimuth thruster device. This form of power transmission is called a Z-drive because the rotary motion has to make two right angle turns, thus ...
A ship equipped with tunnel thrusters, indicated by the circled "X" markings above the water line. Manoeuvering thrusters (bow thrusters and stern thrusters) are transversal propulsion devices built into or mounted to either the bow or stern (front or back, respectively) of a ship or boat to make it more manoeuvrable.
An azimuth thruster is a configuration of marine propellers placed in pods that can be rotated to any horizontal angle , making a rudder redundant. These give ships better maneuverability than a fixed propeller and rudder system.
Steerprop's main products are Z-drive and L-drive azimuth thrusters used for main propulsion of tugboats, icebreakers, offshore vessels and passenger ships. [3] In addition to pushing and pulling type thrusters, the company also offers a line of contra-rotating (CRP) propulsion units with two propellers rotating in opposite directions.
The water caterpillar boat propulsion system (Popular Science Monthly, December 1918) An early uncommon means of boat propulsion was the water caterpillar. This moved a series of paddles on chains along the bottom of the boat to propel it over the water and preceded the development of tracked vehicles . [ 34 ]
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Transverse Thrusters are installed in the bow or stern of a vessel in order to improve maneuverability. Depending on the type of vessel, the range of application for Transverse Thrusters extends from harbor maneuvering to positioning tasks offshore. The units can be installed either with a horizontal or vertical motor flange. [6] [10] [11]