• PT Youtube
  • CW Facebook
  • CW Linkedin
  • CW Twitter
4/1/2015 | 1 MINUTE READ

Electric ferry runs quietly with composites

Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Infused sandwich construction hull and superstructure panels offset battery system weight.


Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Related Suppliers

For marine transportation operators driven by ever-tighter environmental regulations, emissions and nuisance noise reduction have joined increasing efficiency  as top priorities. One means for meeting them all is electric propulsion. A case in point is Stockholm, Sweden’s SL public transportation system and its ferry operator Ballerina, which recently introduced its first battery-powered ferry boat. Featuring a high-tech marine lithium-ion (Li-ion) battery system from Saft Group (Paris, France) the M/S Sjövägen makes 10 stops on a 50-minute route through the Stockholm waterways all year, completing eight round trips per day. Designed and manufactured by boatbuilder Faaborg Vaerft (Faaborg, Denmark) with engineering firm Principia North A/S (Svendborg, Denmark) and marine fire-suppression expert Wilhelmsen Technical Solutions (Lysaker, Norway), the ferry’s composites were a must for the majority of the vessel, to offset the weight of the battery packs. 

The ferry’s hull and superstructure feature fiberglass-faced sandwich construction cored with Divinycell H polyurethane/polyvinyl chloride foam, a high-strength closed-cell product with good fatigue resistance and low water uptake, made by Diab International AB (Laholm, Sweden). “We used the sandwich composite panels mainly for the hull, topsides and wheelhouse,” says Jan Ulrich Mortensen, managing director at Faaborg Vaerft. Christian Karlsson, DIAB’s sales/marketing manager for Europe and Asia, says the hull sandwich was layed up in a one-piece mold and infused. The superstructure components were assembled from infused flat panels. “It is a great solution,” sums up Mortensen, “due to its strength, noise reduction and vibration-damping properties.”


  • Double-bag infusion: 70% fiber volume?

    A double vacuum-bag system and tight process control enable repeatable fiber volumes of 60 to 70 percent and improves consistency of infused laminates.

  • The evolution of infusion

    As resin infusion continues to infiltrate composites, fabricators across the market spectrum drive materials and process developments in pursuit of process control.

  • Fabrication methods

    There are numerous methods for fabricating composite components. Selection of a method for a particular part, therefore, will depend on the materials, the part design and end-use or application. Here's a guide to selection.