Hi Frank, hello everyone,
Long time no see
For those of you who haven't yet had a chance to get acquainted with this patented, new type of very small, personal boat called W-kayak, I thought this movie and info could strike a cord, as they show it under sail (55 sq ft), sans outriggers.
That blog alone contains some 500 pages, and the website that hosts it about 100 more, including numerous in-depth technical articles, dozens of movies, etc., So I think those of you who may be interested to learn more, are likely to find answers to their questions by searching there.
http://wavewalk.com/blog/2010/09/10/upwind-sailing-the-w500-kayak-standing-up-no-outriggers/
The boat's principal applications are paddling and fishing, although some people have motorized it, usually with electric motors.
BTW, W-Kayak is a commercial name. The boat has little in common with either sit-in or sit-on-top kayaks, except for its being used for similar applications, and propelled by similar means.
S-Y