I just read were some scientists from Canada have just made an important breakthrough in solar electric generation. A more powerful solar panel, 30% more elecrical power and get this. It is so thin strong and flexible that it can be applied to canvas. Could generate enough electrical power to operate an electric motor for propulsion, even works in dim light. According to what I have read product should be available in next two or three years. Also it seems that this product is a single film that may even be spayed on. Imagine your sails as large solar electrical generators providing electrical power in addition to wind power.