[John S Mosby]

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.

[PeterPrinciple]

https://en.wikipedia.org/wiki/Oceanbird

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It is interesting technology. It is appropriate for some situations.

Looking at the above, it is NOT a cargo ship as we currently understand.

But things might change if there is a demise of centralized government and big business. Lots of opportunities then for small business. Everything has pros and cons.

So far, not willing to invest my money.