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Instead of a tunnel thruster, boats from 30 to 80 feet (9 to 24 m) in length may have an externally mounted bow thruster. As its name suggests, an external bow thruster is attached to the bow , making it suitable for boats where it is impossible or undesirable to install a tunnel thruster, due to hull shape or outfitting.
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).
It has a bow thruster for maneuvering in crowded anchorages and channels. It also has small underwater fins for coping with the rolling and pitching caused by large waves. It is equipped with a stern launching ramp, like the Marine Protector class and the eight failed expanded Island-class cutters.
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.
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.
In addition to the main engines, a 1,000 bhp (746 Watt) bow thruster aids in maneuvering. [4] The low physical overhead of the engines allow for another deck of vehicle space above. [2] A total of five 39-ton cranes are used to move cargo, situated with two double cranes at midship and a single forward. [1]
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Her Dynamic Positioning System (DPS) uses this positioning information, the ship's controllable-pitch propeller, and the stern and bow thrusters to keep the ship on station without any human input. These systems allow Juniper and her crew to work more buoys in less time, more efficiently and safely, and in tougher environmental conditions than ...