As ships continued to grow in size and became faster, modern systems easing human effort were incorporated.
We are all familiar with the use of a rudder, which helps in turning a ship as and when required. Rudders are the principal system for the entire motion and control of the ships.
A vessel, under pilotage, departed a port in ballast and was down bound in a restricted waterway. The engine control was set to bridge control and a helmsman was using manual full follow-up (FFU) steering.
The repair of bronze rudders and propellers normally requires the boat to be pulled up onto a slipway, lifted out of the water to the quayside or dry-docked.
Most boat rudders and propellers are cast from good quality alloys in an attempt to reduce corrosion and other wear from immersion and operation in seawater. Depending on the design and requirements of the boat, a boat’s rudder can be fitted outboard, being hung aft, or inboard hung under the hull
The Wärtsilä Steerable Thruster (WST) has been developed in parallel with the latest operating demands for tugs, river-going vessels, and various offshore support vessels.
A compactly designed axial pump with excellent efficiency, cavitation and noise characteristics.
The waterjet unit is completely pre-assembled, thereby reducing installation time.
Wartsila retractable thrusters are used with dynamic positioning (DP) systems or provide additional thrust capacity for station keeping.
The selection graphs indicate the jet size required based on the relation between the engine power and the design speed of the vessel.
The combination of high thrust values with compact dimensions provides additional thrust for a wide range of vessels types. In auxiliary applications, transverse thrusters support the mooring or harbour operations of merchant cargo vessels. When applied in Dynamic Positioning systems, transverse thrusters extend the DP capability of, for example, offshore supply vessels.