[Rio]

Here they are:

https://www.youtube.com/watch?v=_Fbfac8pXKc&t=4s

[Rio]

I wonder if this is similar to the old Cousteau ship Alcyone...
https://en.wikipedia.org/wiki/Alcyone_%281985_ship%29

[sit-rep]

mickey mouse...

and if they make any difference at all over the engine(s) they will only matter on down wind courses.