C-Job designs wind-assisted Flettner Freighter

The 8,500dwt Flettner Freighter for Switjink Shipping has been built to accommodate LNG engines if selected The 8,500dwt Flettner Freighter for Switjink Shipping has been built to accommodate LNG engines if selected

C-Job Naval Architects has delivered the design for a wind-assisted general cargo vessel to Dutch shipping company Switijnk Shipping.

The 8,500dwt vessel will be equipped with two Norsepower rotor sails - deck-mounted rotating cylinders that utilise the Magnus effect to create a propulsive thrust. These will supplement the main engines and are expected to achieve fuel savings of around 14%.

C-Job was approached by Switijnk Shipping following its involvement in the European Union project S@IL, for which the naval architect had developed a 4,500dwt freighter with four rotor sails. After studying the prevailing wind patterns on Switijnk’s proposed routes, C-Job decided to design a new vessel, the FF8500, with two larger sails.

Jelle Grijpstra, business manager, C-Job, said: “Together with Norsepower, we concluded that two larger sails would yield a comparable propulsive force to four smaller units. Also, with two rotor sails, one on the bow and one on the stern, there would be no chance of wind shadows affecting performance.”

The main engines have not yet been decided. The company has reserved space for LNG-fuelled engines, but said that the final decision would depend on the availability of LNG bunkering infrastructure along sailing routes.

The next stage of the project will consist of testing at Maritime Research Institute Netherlands (MARIN), where velocity prediction research will aim to validate the design and quantify the fuel savings to be gained.

“Once investors are convinced and the financing is arranged, then Switijnk can continue with the process of selecting a shipyard to build the vessel,” Grijpstra added.

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