Fleet in service – exploit its potential, control costs: Bunker saving with fast vessels

By Peter Pospiech at October 10, 2013 04:05
Filed Under: Company News, drive systems, General, New Technology, Propulsion systems

Propulsion improvement adaptations achieve fuel consumption decrease, depending on ships type, of up to six percent.

To reduce fuel consumption on vessels, different propulsion improvement adaptions can be done – according to type of vessels and operating range. While pre-swirl-equipments increase the propeller force, boost nozzles the drive efficiency by an effective propeller force. Post-swirl-equipments are leading partly the torsional energy back into forward speed. Because of these pre-swirl-equipments or nozzles fuel consumption can be reduced by up to 5% and by propeller fins and rudder bowls of up to 2%.

The following adaptations can be used: pre-swirl-stator, post-swirl-fins, nozzles, propeller fins, German Leitrad and Costa-Bowl. Which adaptation leads to an efficiency increase depends on the operating profile of the vessel. To evaluate the potential as well as the interaction with the ship’s hull and also other components, an analysis by the help of computational fluid dynamics (CFD) is highly recommended. The completion of towing tests makes an evaluation, based on the adaptation equipments, possible.

The Becker Twisted Fin

One of the remarkable products is the “Becker Mewis Duct” which has been tailored perfectly to the target group of bulker and other “slowpokes”. The company reports of results of up to six percent by this system. Since December 2012 already more than 150 units have been sold and installed worldwide.

For fast ships the company has developed the so called “Becker Twisted Fin”, a nozzle with integrated fin-system, which is installed in front of the propeller. This component results in a propeller efficiency increase. 

As a well-known reference customer shipping company Hamburg-Süd could be obtained. They installed the “Becker Twisted Fin” meanwhile on ten container vessels of the “Santa”-class (7.100 TEU, speed 22.2 kn). Thanks to the innovative component up to 4% fuel could be saved according to the company.


Image source: Becker


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