have a look at this bad-boy!
will do 8 knots, only problem is that it costs $1M

have a look at http://www.terrawind.com/terrawind.htm for some more info

that is amazing! if its over 5 tons though difficult to park in england so we will all have to stick with what we have.
anyway at 8 knts would make much headway going for a pint across to dovey in the full flow of the estuary

I have one if it comes with corrosion guarantee

Not much good for surfing the Borth waves though