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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).
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.
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A "ram" bulbous bow curves upwards from the bottom, and has a "knuckle" if the top is higher than the juncture with the hull—the through-tunnels in the side are bow thrusters. [1] A bulbous bow is a streamlined flaring or protruding bulb at the bow (or front) of a ship just below the waterline.
Dynamic positioning (DP) is a computer-controlled system to automatically maintain a vessel's position and heading by using its own propellers and thrusters. Position reference sensors, combined with wind sensors, motion sensors and gyrocompasses , provide information to the computer pertaining to the vessel's position and the magnitude and ...
Quantum-class ships are powered by two Azipod XO thrusters that have a capacity of 20.5 MW (27,500 hp) and four bow thrusters with a power output of 3,500 kW (4,700 hp) each. [40] The diesel-electric propulsion system powers the ships for a cruising speed of 22 knots (41 km/h; 25 mph). [ 40 ]
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.