On their web site, in the technical section (http://pdqyachts.com/power/34technical.htm) PDQ claims that, to meet CE Regulations for both Class A (Ocean) and Class B (Offshore) requirements, they've done hydrostatic stability analyses which show that the Powercat 34 has positive stability up to a heal angle of 72.4 degrees. (The graphs are available for inspection.) I'm sure, to some extent, this is good salesmanship, but I have not seen anything comparable on other manufacture's web sites. Henry Clews