John posited, "The key question is whether we make it a hard requirement for the PPM to recover and function after a rollover? If so, that's going to take us down a fairly narrow path, much like those 47 foot surf boats that the US CG uses along the bars in the west. Or Dashew's boat." I'll suggest that a typical trawler style cruising boat Can be rolled in crummy conditions and may stay inverted or may right, as Mike has suggested, depending on conditions. Most importantly, for survival in this case, water ingress into the hull must be minimized. Windows must remain intact, hatches, dorades, doors must be secure, and of course the basic hull/deck structure must be able to withstand the exercise. And if the hull was still inverted, the occupants would hope for conditions to return the boat to upright. Then the chance of getting underway is investigated. If the watertight integrity is violated, the boat will sink to the bottom. My memory may be faulty here, but I believe on a voyage around Cape Horn (west to east?) subsequent to our fearless leader Georgs record breaking NY to San Francisco voyage aboard 'Great American', the trimaran, the boat capsized down south and was righted by wave action after survival mode was adoppted and thankfully all were rescued and survived. Georgs, Is this accurate? Now my present suituation is a bit different as I'm dealing with a multihull, in this case a powercat. When my boat is overpowered and flipped, my stability upside down is about equal to rightside up. It will take a hell of a force to invert me, but once that happens, I'm essentially upside down for good. The good news is that even upside down, with broken windows and total flooding of the interior, my inverted craft will remain afloat. A foam cored, epoxy/glass-skinned structure inherently (in this case) carries far more bouyancy than the weight of the machinery. A built in liferaft essentially. Every compartment in the boat can be violated with holes to allow seawater entry, and the boat will float; rightside up or upside down. The occupants will need to adjust. Whereas a mostly solid laid-up fibreglass hull with a lot of machinery and Lead Ballast to boot, when filled with water, will quickly go down. Metal hulls go faster. Wood epoxy hulls may have a fighting chance for ultimate survival but due to thinner hull thickness (skin volume) and skin density, may float but will not be comfortable when swamped. If say, a Nordhavn, Krogen, Another name, production trawler were to roll and fill with water, she'd probably sink very quickly. Back to John's question; it may be whether one is comfortable most of the time in most conditions in a typical trawler or one needs a guarantee for ultimate survivability. Survivability for the boat that is; any one of us can hit his/her head any time and miss the whole adventure. We're immortal until we die and our boats will probably outlive us. regards, Bill