Actually I found both a "high tension wing/flex sail" (almost a full wing) and a "solid wing sail", similar to what MW has, which Fred Haywood was working on, both came out in '83 and publicized in early '84, but both have since disappeared. Got the mag, Wind Surf June '84, I set it aside, but haven't taken any pic yet. Also another one in Wind Surf June '87 of a full double surface wing sail, similar to MW's again, no pic yet, it also had a similar future.
But in the mean time, check this out~
