This is something that I have been looking at for some time now. I hasten to add, not from the point of view of designing or even making it, but trying to get more information about who is doing it. A chap in Australia has been running his car on water for years. I take my hat off to these men and women who develop such devices and let them go out to the world. See Friends of Ko'ox Tun and read my Blog entries to find out why these idea are finally coming to the notice of the public.