Friends, I found this thread by accident. There appears to be no consensus. 54 pages is beyond my strength, but I saw the film. This is incredible! New horizons are before us!
Unfortunately, I still have questions. First of all - the car moves faster than the wind, that is, it moves in the oncoming air flow ?! Tell me, why is this impossible with complete calm? After some initial impulse, of course. No, no, a perpetual motion machine is impossible.
And one more thing, it seems to me that the ribbon (speed indicator) is in the aerodynamic shadow (or inside the vortex) and much lower than the propeller, where the wind is slower.
Finally, regarding the background for the invention. Under certain conditions, the movement of a sailboat at an angle to the wind can have a higher speed than the wind. But not in the direction the wind is blowing!