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An age of greener, more efficient shipping may be in the offing as a specially modified 43,000-tonne bulk freighter completes a six-month sea trial using a combination of diesel engines and a set of high-tech automatic sails to catch the wind.
Rather than usual sails these are solid and foldable and act more like plane wings
I mean sails form an aerofoil but these are ridged aerofoils.