Last spring I was eves dropping on our Marina Manager giving a weather briefing to a few power boaters who were prepping to cross the Delaware Bay from Delaware City to Cape May. I really thought he over did it, until is at down and thought it through.
These guys were mostly doing the Great Circle and none had been on such an exposed bit of water
before. Yes the Chesapeake, but that has more places to seek shelter and less current
Anyway, looking at the height of the fly bridge, and the draft
, it is easy to see that these guys could, if handled poorly, go over. They will likely get at least a rough ride.
I suspect fewer power boats, trawlers, etc. turn turtle because they are less exposed that sailboats, they stay inshore. There is a 65 footer with 4-1/2' of draft
sitting in the yard right now. Double decker with a fly bridge.
Someone above mentioned sea height and boat length. That is probably from some studies after Fastnet and is described in Coles Heavy Weather Sailing.