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TUNNEL THRUSTERS Large vessels usually have one or more tunnels built into the bow below the waterline. An Impeller in the tunnel can create thrust in either direction which makes the ship turn. These bow thrusters, also known as tunnel thrusters, may allow the ship to dock without the assistance of Tugboat s, saving the costs of such service. Ships equipped with tunnel thrusters have a sign above the waterline over each thruster on both sides. The sign for a tunnel thruster is a big white cross in a white circle. EXTERNALLY MOUNTED BOW THRUSTERS Instead of a tunnel thruster, Boat s from 30 to 80 feet in length may have an externally mounted bow thruster. As its name suggests, an externally mounted bow thruster attaches 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. Externally mounted bow thrusters have one or more Propeller s driven by a small reversible electric motor which provides thrust in either direction. The added control provided by a bow thruster helps the Captain avoid accidents while docking. EXTERNAL LINKS
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