from this relates to the point someone raised about the (lifting) keel
It was a source of some surprise and joy to me that this boat was so docile (except in the OP situation) at extreme heel angles.
I think the reason might lie in two design traits. Firstly, the narrow waterline beam (which made her tippy, but wonderfully responsive, and a delight in small breezes)
Because there was not a hard turn to the bilge
carried well outboard
, she didn't lever her keel
up towards the surface in the way boxy hulls tend to. I wonder if that makes ventilation less likely. (I'm thinking about how aerated the surface water
becomes in prolonged white squalls, and how deep the trough from the bow-wave can get)
Secondly: there's that long shallow stub keel shown in the lines drawing. If the lift
keel were to stall, (as high aspect ratio keels are more prone to do) the stub keel is going to maintain something closer to laminar flow, and provide some lift
, and maintain a semblance of balance.
It's also potentially a fence to prevent ventilation.