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Marine Propulsion & Auxiliary Machinery

Marine Propulsion & Auxiliary Machinery

Wärtsilä launches retractable thruster

Wed 06 Dec 2017 by Paul Fanning

Wärtsilä launches retractable thruster
The Wärtsilä WST-24R thruster offers up to 20% more effective thrust than comparable conventional thrusters

Wärtsilä has launched the Wärtsilä WST-24R, the industry's first tilted steerable thruster with combined electric retraction and steering.

Enabling excellent auxiliary manoeuvring in stationkeeping or dynamic positioning (DP) operations, the Wärtsilä WST-24R provides high reliability, easy installation, integration and maintenance.

One of the most notable features of the new thruster is the gearbox, which has an 8-degrees tilted propeller shaft configuration. This significantly reduces thruster/hull interactional losses, producing up to 20% more effective thrust than conventional non-tilted thrusters and enabling lower fuel consumption. This extra effective thrust directly contributes to the advanced DP capability of a vessel.

Replacing the existing LMT 1510, the Wärtsilä WST-24R thruster offers more than 10% thrust as a result of the reduced power density. This, combined with improved hydrodynamics and the dedicated Wärtsilä thruster nozzle design, reduces the environmental impact of the propulsion system. The Wärtsilä WST-24R can also be delivered to comply with clean notations and is optionally compatible with the US EPA's VGP2013 stipulations.

The Wärtsilä WST-24R is also designed to achieve reliability with fewer components. All systems are easily accessible for maintenance, while the combined steering-retraction seals are designed to have no oil to water interface to reduce environmental risk. The steering is electric, rather than hydraulic, further enhancing the capabilities of the system, and the new retraction system is lightweight and safe with self-locking electric actuation.

The unit is particularly suited to applications in shuttle tankers and offshore support and construction vessels, providing them with safe and efficient operations.

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