Not sure about this one example but working in the industry and following the development of wing sails the ones I’ve seen will fold one way or the other. This example in the article is probably a prototype or even experimental implementation to test the efficency.
Not sure about this one example but working in the industry and following the development of wing sails the ones I’ve seen will fold one way or the other. This example in the article is probably a prototype or even experimental implementation to test the efficency.
Examples of folding sails in development: https://www.theoceanbird.com/oceanbird-wing-560/
https://terntank.com/2023/02/sail-into-the-future/