Catamarans do a "modified" roll tack. It is the same principle as a roll tack for monohull dinghies, but we can't exactly "roll" the way they do. In our case it is more of a "rock" than a "roll."

Anyway, the technique and the term came from the monohulls. If you ever see a Laser doing a roll tack in light air, you will definitely understand what it means.

The Cat Roll Tack is very similar to a dinghy roll tack, only not as exaggerated.
Tornado explained it perfectly and if you want to see it done almost perfectly, again I suggest getting the video -- it tells you and shows you exactly what you want to do.., as well as what the crew should do
Good luck,
Rick

As Rick mentioned earlier... The jib can cause you to back down hard and flip in high winds. Be sure the crew moves forward and to the new weather side once the boat is head-to-wind and the jib is back winding the bows around. That will help keep the bows from coming up too high. That way they can crack the jib early if needed to help prevet a backwards flip. If the bows are high on a swell and the jib is backing the boat around you certainly can flip... been there, done that. But, you have to backwind with these asymetrical hulls and especially in anything rough.

I am sure it has been said before, but key to me is also being sure the main sheets out a bit once the jib is backing. This allows the bows to continue around. The main, if left sheeted, will tend to keep the boat weather vaned into the wind. Let the boat come well around and re-set the jib before sheeting the main... and sheet the main slowly at first to get some boat speed. I guess even more critical since the rudders are small.