The University of Strathclyde in Scotland has developed a new rudder system as part of the €6m (US$7.2m) European Union-funded GATERS research project under the Horizon 2020 Fund.

Called the gate rudder propulsion and steering system, unlike a traditional rudder which sits behind a ship’s propellers to steer the vessel, the U-shaped gate rudder – essentially two separate rudders – sits astride the propeller which, as a result, acts like a nozzle around the propeller and generates additional thrust, showing  fuel-saving potential of 15% in calm waters and up to 30% in rough seas during early trial evaluations.

The gate rudder has been licensed to Wartsila.

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https://splash247.com/scottish-university-develops-new-fuel-saving-rudder-system/