$10,000 bet for downwind faster than the wind - video

[jimfols]

I could not remember the vertical rotary sail are called (Flettner Rotor Sail), but I ran across this site while looking. Apparently, there is patent on the the design that is now used on "Land Yachts" as seen in the Veratasium video.

ROTARY SAILS WIND TURBINE POWERED BOATS CARS AND SAILING SHIPS

An article regarding Flettner Rotor sails: ROTARY SAILS WIND TURBINE POWERED BOATS CARS AND SAILING SHIPS

Thank you for the link.