....
There may some instances where they will capsize your catamaran.
Here's an interesting article by Cliff Biddick in the Cruisers &
Sailing forum about a 42' Atlantic.http://www.cruisersforum.com/forums/...oled-atlantic-...
....

Very interesting. I wish there were more details on the capsize
itself. I have sailed an Atlantic 42 all over the Pacific. I've seen
some pretty unpleasant weather. Certainly more difficult weather than
is reported for this capsize. This last trip up from New Zealand to
Hawaii, which we did non-stop, we spent something like a week beating
into gale force winds. The auto pilot sailed 99.9% of the time.
I've had the boat up to just under 20 knots power reaching with full
sail in about 20 true and I've never gotten a hull out of the water.
So, it astonishes me that they were able to flip their boat in a
moderate breeze. I suppose they were lighter than we are since they
weren't carrying a live aboard load and they were in fresh water so
they had less reserve buoyancy but... I just have to believe that
they had at least 20-25 knots of true wind and a boat speed in excess
of 10 knots to do this and I can't imagine sitting below under auto-
pilot with full sail in those conditions. What were they thinking?

-- Tom.