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Retractable Thrusters
Reliability and performance

Wärtsilä Retractable Thrusters

High performance manoeuvrability and station keeping

Wärtsilä retractable thrusters have been selected for vessels worldwide, operating in the most demanding environments. Our customers are secure in the knowledge that each system from Wärtsilä conforms to the highest performance and reliability standards, can deliver more efficient thrust that reduces fuel consumption and are also supported by a worldwide network of service and support workshops.
 
When selecting a dynamic positioning (DP) system Wärtsilä Retractable Thrusters are second to none. With a power ranging between 750 and 6500kW in both L-drive and Z-drive options, there is a solution to suit any operating profile and vessel - including offshore support vessels, offshore construction vessels, shuttle tankers and special vessels such as dredgers or heavy lift vessels.
 
The vertical retraction system minimizes space requirements in the vessel and enables full retraction that reduces the vessel’s resistance and allows access to shallower waters and ports. The thrusters are controlled by the DP system or from the bridge stations by Wärtsilä ergonomic controls with intuitive touch screen displays providing intuitive management of the entire DP system.

WST-24R & WST-65RU

The winds of opportunity webinar

W?rtsil? Steerable Retractable Thrusters brochure

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Offshore Wind Farm
Solutions

How can SOV and Installation vessels exceed regulations and efficiency demands

View infographic »

Offshore Service Vessels

By combining the advantages offered by Wärtsilä’s single-source supplier capabilities

Download white paper»

Plug-and-Play Thrusters - Reduce installation time and complexity

As global demand for renewable energy increases, the Prysmian Group has selected Wärtsilä’s retractable thrusters for the worlds most advanced cable laying vessel yet – the Leonardo Da Vinci. The Leonardo Da Vinci is a DP3 vessel and will be able to handle cable laying operations to depths of up to 3,000 meters, in some of the worlds most extreme weather conditions.
Download BWP Thruster requirements for wind farm vessels

Thruster requirements for wind farm vessels

Offshore vessels are large and complex vessels due to the work they are designed for. In the case of windfarm support and installation vessels, one of the most important elements are the thrusters and the DP system. In this white paper we look at the features and requirements of an effective DP system and how design and configuration can be optimised to deliver in some of the worlds most extreme sea conditions.

Why choose Wärtsilä

The excellent efficiency and performance of Wärtsilä retractable thrusters is further enhanced by the capability to design and configure the optimal configuration and power requirements to fit the vessel actual operating profile and needs of the owner. This is achieved through the use of advanced calculations including hydrodynamics and computational fluid dynamics (CFD) and includes the ability to add system failures to ensure safe operation. The result of these calculations and analysis allow for an accurate view of the thruster position, combination of thruster type, and most importantly the power required to deliver the thrust to support vessel operations safely and efficiently – this detailed insight allows the correct total vessel power requirement to be calculated rather than estimated, which can reduce the cost of the total power train configuration.

Add to this the 8° tilted propeller shaft, available on the latest models and Wärtsilä is able to offer a retractable thruster with reduced thruster and hull interaction, making it the most efficient retractable thruster package in the market. The unique design means that customers can expect up to 20% more effective thrust than conventional non-tilted thrusters, depending on vessel configuration and application.

By bringing together these technologies and expertise in a single configurable solution approach, the optimal solution can be agreed, which when combined with Wartsila’s thruster performance results in reduced overall weight and increased performance.   This ensures that owners, operators and yards benefit from significant savings and efficiencies not before possible.  


Retractable Thruster Power Range

    750 - 2000 kW

    The Wärtsilä Retractable Thrusters up to 2000 kW are suitable as auxiliary propulsion units for offshore supply vessels (OSV), offshore construction vessels (OCV) and similar vessels. The thrusters are based on a modular and flexible design which enables optimum integration in the vessel. Although retractable thrusters are primarily used for DP, they can also be used for main propulsion if correctly selected and sized.

    Key Benefits:

    • Retractable to improve hydrodynamics and enable operations in shallow water 
    • High thrust to power ratio
    • Combined steering and retraction system reduces thruster room space requirement
    • Optional compliance with CLEAN notations and US EPA VGP2013 requirements
    • Configurable and customisable for easy vessel integration
    • Delivery as pre-assembled plug-and-play unit for simplified installation
    • Designed for easy access serviceability and maintenance
    • Fast and automated retraction and deployment

    2000 – 4500 kW

    The Wärtsilä WST-R is a powerful retractable thruster designed to provide auxiliary manoeuvring capability in dynamic positioning or station keeping operations. The power levels, small footprint and light weight makes it the ideal choice for shuttle tankers, Jack-Up Vessels and many offshore support and construction vessel types.

    The excellent hydrodynamic efficiency and performance of the Wärtsilä steerable thrusters is enhanced by the 8° tilted propeller shaft, which provides customers with a retractable thruster that has the lowest thruster and hull interaction, making it the most efficient retractable thruster package in the market. The unique design means that customers can expect up to 20% more efficient thrust than conventional non-tilted thrusters, depending on vessel configuration and application.

    Key Benefits:

    • 8° tilted propeller shaft delivers 20% higher thrust 
    • Retractable to improve vessel hydrodynamics and enable operations in shallower water
    • Less power needed for first class performance thus lowering operational cost (OPEX)
    • Combined steering and retraction system reduces thruster room space requirement (electric driven for WST-24R and WST-32R, hydraulic driven for WST-45R)
    • Plug-and-play pre-aligned package for simple and fast installation
    • Compact design allows larger propeller within the same vessel envelope space
    • Optional compliance with CLEAN notations and US EPA VGP2013 requirements
    • Oil-free steering/retraction sealing system (WST-24R and WST-32R)
    • Key components, such as the steering and retraction seals can be maintained inboard

    Wärtsilä-WST-24R
    6500kW 
    The Wärtsilä Retractable Underwater Mountable Thruster (WST-65RU) has been designed to meet the needs of large offshore construction vessels (OCVs) as well as semi-submersible rigs and drill ships.

    With its power output up to 6500kW it is typically designed for vessels that require thrusters that can be retracted during transit of while entering shallow waters, to increase the level of operational flexibility. Additionally, the WST-65RU thruster can be mounted or de-mounted while the vessel is afloat, to facilitate thruster maintenance and overhaul during the operational lifecycle meaning there is no requirement for drydocking. The WST-65RU is the first retractable thruster in the market to feature the unique combination of retractable and underwater mountable functionality.

    The WST-65RU is based on the WST-65U underwater mountable thruster which has been designed with performance and reliability as key requirements. The 8° tilted propeller shaft solution is a feature which is also found on Wärtsilä Underwater Mountable thrusters and reduces the interaction between the thrusters and hull significantly, thereby enhancing the dynamic positioning performance of the vessel. The outboard part of WST-65RU is exchangeable with WST-65U, optimizing maintenance and spare part strategies.

    In combination with Wärtsilä’s PCMS (Propulsion Condition Monitoring Service) downtime and maintenance costs can be minimized.

    Key Benefits:

    • 8° tilted propeller shaft delivers 20% higher thrust 
    • Retractable to improve vessel hydrodynamics and enable operations in shallower water 
    • Thruster outboard part can be exchanged without dry docking the vessel: mounting and de-mounting while afloat. (exchangeable with WST-65U)
    • Use of telescopic shaft technology allows the E-motor to remain static
    • Integrated solution provides smallest possible area footprint and overall lighter construction
    • Based on proven recognizable technology and in-house propeller design know-how

    Wärtsilä-WST65-RU

    Product hologram

    Application & vessel configurations

    Type 
     
     Power (max.)
    [kW]
    Input speed 
    [rpm] 
    Propeller type 
     
     Propeller diameter
    [mm]
     Depth
    [mm]
     Width 
    [mm]
    Retraction 
    [mm]
    Layout 
      
     Height without
    E-motor
    [mm]
    Overall
    height1
    [mm]

    Weight2
    [kg]

    LMT CS/FS175MNR 1000  1200  FP or CP   1700 2836 2900  2220 L-drive  6120  7700  20000
    LMT CS/FS200MNR 1200 1200 FP or CP  1900 2865 3020  2400  L-drive  7490  8600  27750
    LMT CS/FS225MNR 1600 1200  FP or CP   2100 3435 3590  2655  L-drive
    Z-drive
    7280 
    -
    8950
    7330 
    31200
    35000
    LMT CS/FS250MNR 2000 900   FP or CP 2400  3710 3666  3000  L-drive
    Z-drive
    8100
    10500
    8115
    34750
    39950
    WST-24R 2400 900
    1200
    FP 2600/2800 4090 4410  3580  L-drive
    Z-drive
    9750
    11690
    9700
    48500
    52500
    WST-32R  3100  900  FP  2800
    4090
    4410
    3580
    L-drive
    10100  12570  57000 
    WST-32R 3300/3500   720/600
    900
    FP  3100/3300 4450  4900 4235  L-drive
    Z-drive
     11030
    -
    13510
    11420
     70000
    75000
    WST-45R 4500 720 
    900 
    FP 3600 5700  5200  4615  L-drive
    Z-drive
    14730
    17930
    14730
    118000
    123000
     WST-65RU 6500 600  FP 4200 5550 5980  7200  L-drive  16850 20100 212500
    Foot notes:
    Other  input speed / power level combinations are available on request
    Maximum power level depends on classification society
    Selections are not valid for classification with ice class
    Values for dimensions and weight are indicative
    Dimensions and weights can vary depending on propeller type, propeller size and project specific customizations
    1 Height indication H2 is for L-drive execution, including generic E-motor
    2 Indicative weights without auxiliaries and oil 
    Campaign_ecosystem_1160 x 200

    Products & services

    References

    • The world’s largest retractable thrusters
      Performance of the propulsion solutions supplied by the technology group W?rtsil? exceeded the design specification and contributed to the success of the sea trials for the world’s largest semi-submersible crane vessel (SSCV). The ‘Sleipnir’ was built at Sembcorp Marine’s Tuas Boulevard Yard in Singapore for the Dutch offshore contractor Heerema Offshore Services (HOS). It was delivered from the yard in July.

      The world’s largest retractable thrusters

    • 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

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

      Nor Valiant

    • Normand Installer
      Delivered in 2006, the Offshore Construction Vessel Normand Installer by W?rtsil? Ship Design is equipped with a complete W?rtsil? package.

      Normand Installer

    Press releases

    Articles

    Upgrading OSVs to take advantage of...

    With the continued growth of the wind energy industry leading to an increasing number of wind farms being...
    3 November 2020
    • Article

    New shuttle tanker beats the emissions...

    A new shuttle tanker concept developed by TEEKAY using W?rtsil?’s marine solutions expertise is setting...
    22 June 2018
    • Twentyfour7. article

    W?rtsil?’s new retractable thruster...

    The WST-24R thruster delivers 23% more effective thrust than its predecessor, uses less fuel and takes...
    19 June 2018
    • In Detail article

    Meet the miracle: WST-24R thruster

    W?rtsil?’s new WST-24R retractable steerable thruster beats its predecessor on a lot of levels: it comes...
    20 April 2018
    • Twentyfour7. article

    Innovating to solve problems: The case...

    When the coronavirus prevented on-site installation of a W?rtsil? Retractable Thruster—the WST-24R, W?rtsil?...
    15 October 2020
    • Article
     

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