The center hull may have a few uses here.
1) The rudder is attached to it.
2) the mast is attached to it.
Cat vs tri configuration for foiler design .
Too much bending in a cat, the tri is stiffer was a design objection one made , the extra drag of two rudders was another.
If the intent of the design is an all around racing machine one could argue the tri configuration would do well in lighter winds below foil lift speed ,--though so could the cat configuration.
The round the world races in 04 featured Playstation and other huge cats , one developed structural problems at the crossbeam hull connection with an O ring system used but I don't think that is reason enough to think the Tri configuration is superior, particularly for a foiler. http://www.morrellim...tion/index.html
Two rudders would add some additional drag but also stabalize the lifting platform moreso . A more stable sail plan is a faster sailplan . The two rudders could be proportionally smaller than one main rudder on the tri also.
I think the mast and related stress and bending problems in the cat configuration could be overcome by using an A frame support that allows a canting rig .
Chris White pattened his design . http://www.wingo.com...te/tiltrig.html
The base of the mast sits on a traveler ,--as it adjusts from center the geometry of the rig cants over and back for higher speeds and lift not unlike a board sail.
Add a large kite like the 18 skiffs with lots of luff angle and the sail plan would add greatly to the foil lifting capability .
I think a larger A frame stayed rig that allowed the mast to be supported at the connection rather than on a traveler would work better and could be similarly adjusted .
Engineering wise it would take the stress out of the center of the crossbeams and transfer the loads to each hull in the cat configuration, that would solve the stress in bending problems to some extent It could also be more balanced much like a sunfish lateen rig with part of the sail area forward of the A frame and pivot point.
One other advantage an A fram rig would have is its ability to be used to right a multihull after a capsize . Obviously the A frame would need to be aerodynamic and made like two wing masts joined at the top.
There is something wonderfull in the creative design process and always enjoy design threads and BSing about faster sailing craft and designs in general .
Damn --now I want to build an experimental craft again .
fast is fun .