The Guardian

I remember seeing in an old encyclopedia pictures of a ship which was propelled by two giant rotating vertical columns in place of sails. How did this work, and why why was it ...

The rotating-sail ship was developed by Anton Flettner, a German engineer at the University of Gottingen in 1922. He had been carrying out experiments to determine how much greater the force exerted ...
CNBC

Maersk tankers to be fitted with huge rotating sails to cut fuel bills

Maersk Tankers, the energy shipping division of Danish cargo giant Moller Maersk, is to fit two, 30 meter rotating sails to one of its vessels. Finnish company Norsepower said its modernized version ...
The Guardian

'Spinning sail' rebooted to cut fuel and make ocean tankers greener

Invented a century ago, rotating columns fixed to ship’s deck interact with wind to provide forward thrust and could make 10% fuel saving An ocean-going tanker is to be fitted with a type of “spinning ...
Popular Mechanics

Cargo Ships Are Turning Back to Wind Power—But Don't Expect Big Triangular Sails

The next time you see a hulking cargo ship plying the ocean, you could be looking at a sailboat. The shipping industry has begun to experiment with rotating towers that can be installed on ships to ...