Did you watch the video? If yes, then good. Do you agree or disagree with the information provided? Based on the demonstration of the wind vehicle, I'm inclined to believe that vehicles can go downwind faster than the wind pushing the vehicle. As long as the vehicle can use the energy provided from the wind to spin the wheels, the wheels will convert it's energy to spin the fan on top to push the car forward by pushing off of air particles. At least, that's how I interpret the physics in the video. Also, the comments on the video contain anything between civil discussion, flat earth, cylindrical earth, or people calling this a hoax. Please stay on topic, and be civil. Edit: Follow up of the first video, feat. Bill Nye, Neil deGrasse Tyson, and Mark Drela. Skip to 14:25 on second video for the explanation of how the Blackbird car works.