Wärtsilä Steerable Thrusters

Designed for tugs, river-going ships and various offshore support vessels.

  • Superior hydrodynamic performance for high bollard pull or maximum propulsion efficiency.
  • Compatible with high speed engines (up to 1800 rpm).
  • Compact dimensions with a high level of integration.
  • Robust design for reliable operations.
  • Maintenance friendly design to minimize downtime.
  • Reduced number of external connections and field bus connections for ease of installation.
  • Multiple installation options: bolt-in, weld-in, can-mounted or split installation.
  • Wärtsilä ProTouch controls with ergonomic levers and intuitive touch screen displays.


  • Two nozzle types: optimized for bollard pull or free sailing.
  • Ice class up to 1B.
  • EPA VGP 2013 compliance

    • The Wärtsilä Steerable Thruster (WST) series is designed for tugs, river-going vessels, and various offshore support vessels. The WST thrusters combine a high bollard pull with 360° azimuthing capability and are intended for vessels that require a high level of manoeuvrability.
    • Eight thruster types ranging from 700 to 3200 kW and a large number of options per type ensure that the right WST thruster is available to match individual project requirements.

    Example configurations


    • FP propeller
    • Bollard-pull nozzle
    • Diesel-mechanic drive
    • Slipping clutch
    • PTO driven steering/lubrication systems

    Wärtsilä Steerable Thrusters

    Platform Supply Vessel (PSV)


    • FP propeller
    • Free-sailing nozzle
    • Diesel-electric drive
    • Electric steering
    • Electric lubrication system

    Wärtsilä Steerable Thrusters  2

    Key benefits

    Superior performance:
    High hydrodynamic efficiency provided by the propeller- nozzle combination together with the optimized shape of the thruster housing and nozzle connections.

    Choice of two nozzle types:

    • Bollard pull nozzle: optimized for bollard pull, with outstanding performance at zero knots vessel speed.
    • Free sailing nozzle: shorter and lighter, designed for free sailing efficiency at 10-12 knots, whilst keeping good bollard pull capabilities at low vessel speeds.

    High speed engine compatible:
    WST thrusters are compatible with high speed engines, as well as with Wärtsilä’s own medium speed engines. All common input speeds between 750 and 1800 rpm can be accommodated.

    Robust & Reliable:
    The thrusters are reliable and fitted with robust gears, bearings, other drive line components and steering system. The WST series comes with an advanced sealing system that includes the option for seal monitoring or the use of environmentally acceptable lubricants (EAL). The WST series design is prepared to meet the US EPA’s VGP 2013 regulatory requirements.

    Installation flexibility: WST thrusters can be installed and mounted in various ways. These include bolt-in and weld-in possibilities with easy to install hull fairing. Mounting from above (can mounted), below, or split mounting allows the yard to optimize the building scheme.

    Compact & integrated: By integrating all the auxiliary equipment needed to operate the thruster onto the top plate around the upper gearbox of the Z-drive system, a truly compact solution is achieved and less thruster room space is needed.

    User friendly controls:
    The thruster and its auxiliary systems are controlled by the Wärtsilä Propulsion Control system. The Protouch panel is space saving and designed to allow easier and more intuitive operation of the thruster functions.

    Ice Class:
    The thrusters are available with Finnish- Swedish Baltic Ice Class, Russian Ice class (RMRS), or Russian river ice class (RRR).

    Easier maintenance:
    The WST thrusters have been developed to be maintenance friendly. By utilising the Wärtsilä PCMS (Propulsion Condition Monitoring Service), downtime and maintenance costs can be minimized.

    Technical Info
    WST table 1
    WST table 2
    Wärtsilä Steerable Thrusters
    WST compact series

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