Or, if there is a hell of a lot of wind like in a major typhoon or North Sea blow— what then. These don’t appear to be retractable back into the ship. Oftentimes ships have to power INTO the wave force direction to survive a storm, and not be broken in two.
“These don’t appear to be retractable back into the ship. “
You didn’t read the article.
There have been proposals for carbon fiber moveable trimmed “sails” that are retractable— ie. on a hydraulic raised center masts— all centerlined on a ship.
Seems even so that this would not be feasible on large container ships that stack 5 or higher bolted containers the entire length of the ship.