"with 5-6knots he end the last regatta hanging out to leeward to fly one hull"
Got this from http://catsailingnews.blogspot.com/2010/04/hanging-out.html

It sounds logic that if this hanging out makes the hull come out of the water your speed will be higher due to less drag. On the other hand you also loose some pressure in the sails at the same time...

Any of you who tried this already? I have but only for fun.