To Malcolm and other designers: All other things being (mostly) equal, is a powercat with shallow draft or deep draft preferable in heavy seas, in terms of stability and seaworthiness? I have read that shallow draft allows the hulls to slip sideways, rather than being prone to capsizing. However, you might think, also, that a 60' powercat with 25 foot beam, 5 foot hulls and 6 foot draft, with engines mounted low and centered, would be rock solid in heavy seas, besides having huge accomodation space and fuel storage galore. I am asking this out of curiosity and abysmal ignorance. Does anyone know of any books that explain the ins and outs of powercat design? Thanks all, Paul