Rotor sails, tilting rotors, hard sails: There are a lot of wind-assisted propulsion solutions out there.
French shipbuilder Chantiers de l’Atlantique thinks that Solid Sail, developed in its long running Ecorizon R&D program, is the best one for large vessels, and in particular cruise ships. Now Bureau Veritas has granted the Solid Sail solution an Approval in Principle (AiP).
Solid Sail is a 1,200-square-meter rigid sail made of composite panels assembled together, which was developed...
https://www.marinelog.com/technology/is-this-the-right-sail-solution-for-cruise-ships/