Damen Shiprepair Rotterdam (DSR) has completed the installation of the propulsion-boosting Becker Twisted Fin on seven container vessels belonging to Germany-based shipping company Hamburg Süd.
The Becker Twisted Fin devices have been installed on seven Santa class container vessels, each with a capacity for 7,100teu and design speed of 22 knots.
All the vessels have now been redelivered to Hamburg Süd.
Designed by Becker Marine Systems, the Twisted Fin devices are intended to improve the performance of the vessel in combination with the propeller and the aft body of the vessel.
Becker Marine Systems said the system offers a fuel saving of up to 4%, reduces NOx and CO2 emissions, and requires no moving parts or maintenance.
Becker Marine Systems developed the energy saving device for container ships and other types of fast vessels with bulbous sterns after two years of research .
The Becker Twisted Fin generates a pre-swirl to counter the effect of propeller swirl, which reduces the efficiency of ships.
Becker has developed special end caps for the fins, which help prevent swirl formation, while the small nozzle ring generates thrust and provides stability to the fins and reduces vibration.
The installation follows after a model test of the Becker Twisted Fin prototype on a Hamburg Ship Model Basin HSVA in early 2012 and June 2012, which demonstrated fuel savings of close to 4%.
Tank tests were conducted in October 2012 and first installation took place in December 2012 at Damen Shipyard in Rotterdam.
Image: Becker Marine developed energy saving device is suitable for newbuildings and vessel retrofits, and can be installed in front of the propeller. Photo: Damen.