Rick, "If 5mph is your target average speed I can give you a solar powered concept that has infinite range and much more practical as a cruising boat."
Maybe you can make yourself useful ^^
When I do the wing lift calculations, using a CL of 1 and area of 25 m^2 at 15 knots of wind I am getting a grand total of 911 newtons (kgm/sec^2) for a grand total of 12 hp.
(my math may be wrong)
My guesstimate of the cost for each wing is around $20k per wing. (making them myself)
Yes I am extremely interested if you can come up with a complete solar powered system that can generate 20 hp, 24 hours a day, in the $60 to $80k price range.
It would definitely be worth it.
Talador