The reason I began this discussion was an attempt to effect changes in thinking and to petition input from others who also do not beleive in 'impossibilities'.

I seem to have missed that part of the discussion wherein I implied that "I" have all the answers, however any designer who fails to see the importance of incorporating 'wing-in-ground-effect' dynamics into the design concept of a 'Sailing Aerofoil Boat' will be missing at least half of the solution.

There is no question that Jons input is brilliant, but as he says he is not the first to consider a wind gradient engine as a means of powering a water craft.

No matter what method of power is incorporated into a sailing aerofoil concept, a designer will still have to transition the craft from water-contact to freedom from water contact - and this transition can not be achieved STABILY without the application of ground-effect dynamics.

For those interested in the theoretical criteria for stable wing-in-ground-effect craft see the following page (Note - this is pretty technical stuff and is meant more for those with an understanding of aeronautical engineering.)

http://www.se-technology.com/wig/html/main.php?open=stability&code;=0