Wings make cargo ship efficiency soar
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.Mixing sail and power isn't a new thing. In fact, it goes back to the very first steamships when shipmasters weren't particularly keen to rely on a cranky, half-experimental portable steam engine to cross the ocean. Even today, all but the smallest sailing boats have some sort of…