Well, as long as this thread has been “hijacked” into a discussion of aerodynamic theory, I thought I’d throw this into the mix. Tom Speer is an aero engineer for Boeing & has done alot of work with sail rigs & solid wings for landyachts & high performance multihulls:
http://www.tspeer.com/
He uses Dr Mark Drela’s XFOIL computer modeling program for his simulations
Also, this one is kind of fun to play around with
http://www.grc.nasa.gov/WWW/K-12/airplane/foil2.html
Regards,
Bill