DWFTTW - Down wind faster than the wind
Sailing directly downwind faster than the wind - No it is NOT impossible!
The wind car in its short and narrow treadmill configuration. Note the radio control for the steering and brakes. The mast with apparent wind flag is not shown.
[youtube]http://www.youtube.com/watch?v=aJpdWHFqHm0[/youtube]
Read more over here
http://www.ayrs.org/DWFTTW_from_Catalyst_N23_Jan_2006.pdf