I have sailed this boat "beach cat" style before but this time it was nervous on the downwind, the boat pressed down the bow and lifted the stern so much that just the tip of the leward rudder had undisturbed water to work with. We need longer rudders if we should push the boat this hard again!

Here's a link to some information about the boat.
http://www.multihulls.org/boats/scarlatti/scmain.htm

/håkan