Really? I've heard of a couple in the last 20 years ... can you point to
any?
This is an odd issue, because people often claim cats flip, sink, or go
missing,
but then are never able to provide examples. There are, of course, a few,
but
very few compared to monohulls

there are thousands of mono's to every two huller out there.

There *IS* a reason for that. In fact, many sound reasons for that.