Re: How do you feel about catamarans?
I find this discussion very interesting and would like to point out the following.
In monohulls typically with a knock down the port lights on the up wind side (not the one immersed) blow out. It's the deformation of the house and internal forces that cause this. One would expect the large open houses would be exposed to similar forces by large boarding seas.
The forces generated by boarding seas can be extreme. I know of empty davits being severely bent by pooping and have had moderate boarding seas destroy well constructed dodgers. I have a JSD and hope to never use it in anger. I do not expect it to prevent damage to the aft sections of my and any other boat mono or multi if those regions are not constructed to allow for such a occurrence. I think with all due respect jzk is being over optimistic. Yes current port light glass is much stronger then in the past. Yes cored houses are much stiffer. Still, such large houses as seen on multi's will have much greater forces applied. They do not have extensive internal bulk heads spanning the large interior open spaces. Without thoughtful design I believe they are potentially subject to sufficient damage as to compromise watertight integrity allowing risk of down flooding. Returning to original question "What current multi's are safe offshore boats?"