Around 12/08 there was some really ridiculous discussion on a trawler blog where some goof ball Canadian yacht designer full of himself stated that after his "analysis" (of the drawings on my web site), the DUCKS lost positive stability at about 50 degrees heel and then capsized.
I of course jumped on him because I had done the calculations years before on the 44 and my figures said positive stability to 140 degrees, not counting the house. That means self righting. As the other DUCKS are similar in design, I stopped figuring the stuff.
Anyway, I spoke with the guy who owns SEADUCKTRESS (the first Seahorse 44) today. He told me he recently hired a Nasal Artichoke to take off the exact lines as built, and figure stability at several loadings. His findings were that the boat has positive stability clear to 180 degrees, which means she is as safe as a Coast Guard surf boat (or a duck) in terms of being rolled over. She WILL come back.
The only consideration is vents and windows. If the vents are closed and larger windows shuttered, it seems very unlikely the ocean is gonna get ya. The only real danger, and a common one that far to many people put themselves into, is pushing on at night into strange anchorages. If you heave-to and WAIT if you aren't sure what's happening or where you are, it is very unlikely you'll ever have a problem cruising. Of course the steel hulls will take a lot but just the same, it's best to avoid the rocks if you can.....

I have to agree with george here .
While crossing from Hong Kong to Subic last June , i went through typhoon Frank (chose to heave and wait instead of getting in Bolinao at night in 70 knots of wind ...) : about stability , i was rolling really badly and the port side flopper stopper pole went far underwater once , that's how bad the boat rolled ... Now , i'm also not a "naval artichoke" but by looking at the boat i can tell that to put one of those poles in the water it has to be more than 50 degrees
Anyway , that was almost a year ago and i'm still floating
cheers
Ben / www.blogatrip.com
currently underway towards Kudat , steady 6.2 knots , 1600 rpm on the Iveco and a bit less than 1.25 gallons/hour
and great 3G internet coverage here in the Philippines !!!