Amateur Yacht Research Society

If you are interested in commercial sail this link may be of interest, it refers to an oil tanker with two Flettnor rotors
http:www.maritimejournal.com/news.101/power- ... rcial-sail
FCB

Sorry but when I tried the link it didn't work, instead try their home page www.maritimejournal.com and click on news and select power and propulsion in the menu, the resulting page needs to be scrolled down 4 or 5 times to find the entry.
Fred

https://www.maritimejournal.com/news101 ... rcial-sail is still working

(it needed the https)
Simon