Winged cargo ship saves three tonnes of fuel per day on first voyage
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.
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IIRC it still burns a crapload of regular fuel, say 14T a day; so yeah, it’s a savings, but it needs to be better.
Any savings is a good step. stop discounting those steps
14% gain is still extremely good.