The Lello, Endurance and Rustler are all approved to take part in the Golden Globe Race around the world. No surprises as they are all heavy displacement hulls. The RCOD while being very fast downwind has a heavy keel. The Muira is well known for its seaworthiness and many have completed circumnavigations. The Atlantis 36 appears to be very stiff and it would be interesting to have some information from those who have sailed on one. The Sadler 34 is derived from the Contessa 32 which survived the infamous 1979 Fastnet race without a problem. The Caribbea is pretty stable as is the Farr 38. The Sadler 26 which is derived from the Contessa 26 on which Tania Aebi did her circumnavigation has the same capsize ratio as the Mount Gay 30 which seems surprising. The Open 60 an out and out racer as is the Flying 15 albeit in protected waters. The Holiday 34 which in my experience is quite tender comes in with a Capsize Screening below 2 which is also quite surprising. Perhaps it was tested with a reef in the main? I could not find any data on the Ocean 31.
Of course when it comes to possible capsize then one needs to look into the “angle of vanishing stability”
The Angle of Vanishing Stability is the point beyond which the yacht will not return to the upright position when the heeling forces are removed and instead will continue to capsize and roll through 360 deg. This is caused when the centre of gravity of the yacht has overtaken the centre of buoyancy. This, of course, is a subject for another day! With thanks to Mike Rothenburg!!