Have not posted for long time, however have been following the thread. Browsing the web I found out the Infiniti yacht brand (thought it was brand bane only for fast luxurious cars). Though not cars, they have patented the DSS (Dynamic Stability System) representing use of additional foils. They seem to be interesting though on the hi-end.
I thought Paulo and all others would find such boats intriguing. I did not find, however, their basic parameters although they seem to be very light and able to carry a lot of sail (like the multihulls).