Hi Don

hope the first one is for protected waters only .

The one that comes to mind in Alum was Pen Duick 4
a tri raced across the Atlantic in the 60s
http://www.france-ouest.com/tabarly/penduick-5.htm

You may try Dick Newick trimaran designs
and Piver trimaran designs

Check the -great links section here on Catsailor also under trimarans for some other more modern tri designs -

good luck with it ,