Flettner Rotor on ships

Flettner rotors to help propel ships is nothing new but have got a renaissance in the last decade or so. It is not intended as sole power source, but to reduce fuel consumption and emission.

Here is an article about maybe the most well known ship with Flettner rotors, the E-ship 1:

Not Rotor sails but MOL is building a Bulk carrier with a retractable sail:

Anybody care to comment on the view from the bridge when the sail is up?

Tiltable rotor sail has been developed to suite ships exposed to height restrictions on their sailings:

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