Kirt,
I know Frank Bethwaites tri (surf ski with wings and almas)but that is a completely separate beast to what was proposed..

The "ultimate 18"
Working back into vague memory banks.. (it was in the early 80s)..
Hull was nomex carbon back then this was radical..
cantered 20-30 degree to windward wing mast (to get lift al la wind surfers new back in the 80s).. Jib and genacker (thinking this means it was "beasho" who wrote the article Australian sailing, as beasho was the guy who reinvented the genacker)..
Mast was held by the wings (sorry cant recall the wing widths but guess it could have been 30 foot..)
On each wing was a surface piercing "plate" .. Imagine a smaller version of foiled open 60 "Hydroptiere" (sp?).. Then you have the idea..

Fortunately for the 18teen guys life insurance companies under the old 18teen rules this would have been classified as a tri.. Thus never built..