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The Becker Mewis Duct® is an energy-saving device developed for full-form slower ships enabling either significant power savings at a given speed or, alternatively, the vessel to travel faster at a given power level.
The Becker Mewis Duct® consists of two strong fixed elements mounted on the vessel: a duct positioned in front of the propeller along with an integrated fin system. The duct straightens and accelerates the hull wake into the propeller and also produces a net forward thrust. The fin system provides a pre-swirl to the ship wake which reduces losses in the propeller slipstream, resulting in an increase in propeller thrust at a given propulsive power. Both effects contribute to one another. The power savings attainable from the Becker Mewis Duct® are strongly dependent on propeller thrust loading, from 3 to 8% depending on individual hull/propeller interaction. The power savings are virtually independent of ship speed. The Becker Mewis Duct® is ideally suited to both new-build and retrofit applications (e.g. tankers, bulkers and MPCs).
• Energy savings up to 8%
• Low SOX and CO2 emissions
• No moving parts
Above: Potential savings and the correlation between power savings and ship size of a Becker Mewis Duct®.
Installation of the Becker Mewis Duct® can easily be performed during the block stage of the stern boss with minimal effort on the part of the shipyard and owner. The yard is able to implement the installation in the production schedule. The Becker design team installs the interfaces of the Becker Mewis Duct® and the ship according to the ship’s steel structure and uses standard steel grades to build the Becker Mewis Duct®. Installation takes approx. five days.
Becker designed the Becker Mewis Duct® to also improve the efficiency of vessels as a refit option. The Becker Mewis Duct® can be installed during regular dry dockings or even intermediate dry dockings either with the propeller in place or dismantled. Becker’s expertise ensures that installation is performed as quickly as possible, taking five days on average. Installation is carried out with Becker’s guidance and supervision using standard welding and fitting procedures, making installation possible worldwide. The Becker Mewis Duct® design of the interfaces to the ship provides the highest strength and stiffness in accordance with classification societies.
Especially suited for: