About the sail that flatens authomatically when the wind increases, all I know is that it is a tri-radial design that was developed by Lars Grael (former Tornado Olympic Medalist) and Arnaldo Andrade (Cognac Sailmakers) many years ago.

If you want more information, I suggest you write directly to Arnaldo Andrade ([email protected]). You can mention this forum and my name if you want, but I don't think it's necessary - he will probably reply anyway.

Cheers,