While I have been reading this list for a number of years, the issue of "The Perfect Passagemaker" and specifically hull form and stability have prompted me to join up and make some active comments. Steve Dashew raised the issue of ultimate stability for passagemaking powerboats a while back when he started to work on his Windhorse project. He wrote at the time that he was surprised (this is from memory) at the low angle of vanishing stability exhibited by many powerboats intended (or purported) for ocean voyaging. I think he mentioned finding few boats with any righting arm beyond about 70 degrees (the angle of vanishing stability). At the time Georgs Kolesnikovs wrote me and asked about my thoughts on the subject. In general my reply was something along the lines of; "I don't really see the problem, I cannot find many (or any?) documented cases of pleasure yachts being rolled over at sea." Can anyone cite an instance (with references) of this? I have lots of instances of commercial vessels rolling over at sea, usually due either to improper loading or downflooding. Mark Tilden mentions perhaps using the US Sailing stability standard. This requires positive stability to a minimum of 105 degrees and a recommended minimum of 120 degrees. To meet this standard your "Perfect Passagemaker" will have to look a great deal like Windhorse. That is, have relatively high freeboard full length, relatively narrow beam, a very small deckhouse above main deck level, and probably no double decking at all. Or perhaps the PP will look like a modern rescue vessel, with a tall narrow house and tiny windows to survive rollover. A more reasonable approach may be to investigate meeting the ISO Standard 12217-1, Small Craft - Stability and buoyancy assessment and categorization - Part 1 - Non-sailing boats of hull length greater than or equal to 6m. I would be willing to assist the list in modeling and calculating stability characteristics of various hull forms. All the best, Tad Roberts Yacht Designer www.tadroberts.ca <http://www.tadroberts.ca/> www.passagemakerlite.com <http://www.passagemakerlite.com/> [demime 1.01d removed an attachment of type image/gif which had a name of image001.gif]