Hi Frenchie

You,ll find a number of accomplished catamaran designers post occationally here on Catsailor along with a number of others like me who just enjoy design ideas and discussion more from a sailing amature design perspective .
Marc has a really good looking project going as you can tell from his section drawings on his post pic . John is a really excellent designer builder from the U K and has a number of excellent catamaran designs to his credit. The Supercat designer Bill Roberts will often post information . We have a number of other really interesting posters that build boards rudders masts and some boats . Dave C built a foiler A Class cat , really interesting project.
Many brilliant people who sail catamarans in all fields.

Enjoy discussing design ideas ,-some are just for fun.
The older boat was an early attempt at something too experimental . You learn a great amount from the experience.I have some old 35 mm slides ,thats about all.
What I was trying to descibe in the other post was a newer concept for planning hulls with more cant along with forward molded in foils .
Pure foilers seem to fall off plane and break ,or have a difficult time in seas . Think the ideal hull shape may be a planning type with smaller forward foils that will not be subject to breaking but still provide some lift .They would also benifit C E to CLR with the chute up allowing a longer spin pole ,increased luff angle for the chute more like skiffs, that would also really help provide lift and still have a reasonabley balanced helm.
The ideal amount of hull cant may be much more than is currently used , the flat bottom forward hull sections of this type of design may use a small foil that would be an extention of it increasing the area for lift to a sufficient amount . Without having huge forward planning hull form .

Enjoy ocean distance racing so like design for that purpose.
Sailing is just a fun sport , though did race ProSail and the Ultimate Yacht Race series in 88 , Professional racing series .--pretty tough to make a living sailing or racing though some do.

Just a fun sport to partisipate in-- Fun to dream sometimes .
Really am getting the bug to build one again but will just have to settle for forum discussion for now. I have learned a great amount .

Hope you will post more often
we need more good design info .
All the best
Carl