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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).
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.
She received new diesel engines, a thorough overhaul of her main electrical motor and its control systems, installation of new electrical wiring and switchboards, new water piping and sewage handling systems, and a bow thruster to improve her maneuverability. The crew's living spaces were upgraded and the furnishings were modernized. [3]
The ship has a traditional twin propeller stern and bow thruster for manoeuvering and like most trailing dredgers, includes bottom doors for dumping, a dredge engine, a jet water engine, a degassing installation, a suction pipe and associated pipelines and valves.
In addition to the main propulsion system, the ships are fitted with a bow thruster. [1] As of 1998, the ships' armament consisted of a Mark 49 RAM surface-to-air missile system, two Vulcan Phalanx close-in weapons systems, six Mark 242 25 mm automatic cannons, and eight 12.7 mm machine guns. [1]
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]
The design has also a retractable bow thruster with which Mercuur can accurately approach a submarine to retrieve her torpedoes, which have been shot during an exercise at Mercuur. Like the water-filled hydrographic research vessel of the RNN it has a sling damper system. [4] In 1985 the construction of the new HNLMS Mercuur began. [2]