Wärtsilä Steerable Thrusters

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.

The aim, as with all Wärtsilä products and solutions, is to ensure optimal efficiency, high hydrodynamic performance, less maintenance and better accessibility for serviceability. With eight thruster types, ranging from 700 to 3200 kW, the WST enables these vessels to meet and exceed the performance levels required for today’s competitive operating environment.

Wärtsilä has the broadest and most complete offering of products, systems and integrated solutions in the global marine industry. We continue to lead the way in innovations that create greater efficiencies, improved safety, and more environmental sustainability."
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Taking tugboats to the next level: Improving performance with Wärtsilä's propulsion solutions

In this white paper, we take a closer look at the different ways in which tugboats propulsion can be improved, and also at Wärtsilä’s next-gen thruster solutions that are designed to improve performance and reduce environmental impact.
    Superior performance

    Large propellers with a tailored design, a smooth housing shape and slender nozzle connections ensure the superior performance of the Wärtsilä Steerable Thrusters. The hydrodynamic design has been thoroughly optimized, with the use of Wärtsilä’s extensive design experience combined with computational fluid dynamics (CFD) capabilities. Since not all vessel performance requirements are the same, the WST comes with a choice of two nozzle types.

    High-speed engine compatible

    The Wärtsilä Steerable Thruster fits well with Wärtsilä’s own medium-speed engines and is also compatible with high-speed engines of other brands. With a selected range of gear ratios, all common engine speeds between 750 and 1800 rpm can be accommodated, as well as electric motors with speeds between 720 and 1200 rpm.

    Environmental performance

    The thrusters come with an advanced sealing system that includes functionality for seal monitoring. The Wärtsilä Steerable Thrusters are suitable to be operated in US inland and coastal waters under the US EPA VGP2013 regulations. Compliance is achieved by using environmentally acceptable lubricants (EAL).

    The newly developed WST thruster series is versatile and can be tailored to comply with specific vessel requirements, without compromising on safety, performance, cost, simplicity, reliability or efficiency."

    Product hologram


    • Jeddah 41
      Delivered in 2007, the Jeddah 41 is a 37m Multi Purpose Escort Tug with a 58 tonnes bollard pull. It was designed by Wärtsilä Ship Design to perform escort service, towing and fire fighting.

      Jeddah 41

    • Nor Valiant
      Delivered in 2008, the 78m ROV / Subsea Vessel Nor Valiant is a highly specialized vessel designed by Wärtsilä Ship Design for a wide range of subsea support work.

      Nor Valiant

    • RRS Discovery
      The Royal Research Ship Discovery is designed to support the multidisciplinary research required for the 21st century. The ship is the fourth vessel to bear the name and continues the tradition of oceanographic research at sea.

      RRS Discovery

    • Stadt Valiant
      Delivered in 2009, the Valiant is a 90 BP escort tug powered by two Wärtsilä 8L26 engines, and is well suited for missions such as offshore terminal assistance and coastal towing.

      Stadt Valiant

    Middle East’s first LNG fuelled tug features full scope of Wärtsilä solutions
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