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Becker Marine Systems has responded to the heavy demand of shipping companies for an energy-saving device for faster vessels. After two years of research and based on seven years of operational experience with the Becker Mewis Duct®, a new energy-saving device for container ships and other types of fast vessels with bulbous stern has entered the market – the Becker Mewis Duct® Twisted. In combination with a new propeller, the Becker Mewis Duct® Twisted can be part of a complete hydrodynamic performance package. The Becker Mewis Duct® Twisted is designed in accordance with the existing propeller setup.
Because savings from the Becker Mewis Duct® are reduced at speeds above approx. 20 knots, Becker Marine Systems has developed a similar device, but with a smaller nozzle, a special, flat profile with much lower drag and fins which extend outwards beyond the nozzle – the Becker Mewis Duct® Twisted for faster hull optimised ships with speeds above 18 knots.
To prevent the formation of a swirl with cavitation at the ends of the fins Becker has developed special end caps for the fins. The small nozzle ring generates thrust, provides stability to the fins and reduces vibrations.
Computational Fluid Dynamics tests, model tests and full scale operation have demonstrated power savings averaging 3% for container ships. Even better results can be obtained with the combination of a Becker Mewis Duct® Twisted and Becker Twist Rudder.
Each Becker Mewis Duct® Twisted is individually designed according to hull geometry, propeller design and engine data. The design takes into account the newest strength, fatigue and vibration requirements from classification societies.
Above: Potential savings and the correlation between power savings and ship size of a Becker Mewis Duct® Twisted.
Especially suited for: