Marine tunnel thruster, is also called side thruster, is a propulsion device installed at the bow or stern of a vessel to acquire latéral manoeuvrability. Some big vessels even has more than one tunnel thrusters to be more maneuverable, which allows it to dock, or sail through narrow waters easily without a tug boat.
Tunnel thrusters can be driven by electric motor, diesel engine or hydraumatic units. Fountom provides options of fixed pitched and controllable pitched thrusters.