As I am planning (dreaming..) a circumnavigation
with a cat including the southern ocean, I did some research
I found so far to cat who did it so far, one is german custom made 44 ft cat and to my surprise, an elderly aussy couple who did on Orana
Another article on southern ocean states that out of 10 mono that tried this route
7 have knocked down (4 came out dismasted) and one has never been found. No data about cats..
The way I understand, the challenge is the need to go south to find westerlies while ice limit can extend up to 48 th lstitude even in summer. The other problem are the huge waves that are not following always the wind
direction..Most people advocates the cats with dagger board rather than fixed keels would be safer..