it is a wheel driven vehicle, using the wind to turn the wheels.
Yep, it's a wind driven vehicle. However, before you saw the video I think you would swear any wind driven vehicle would never be able to achieve twice or three times wind speed going straight downwind. Am I right or wrong? I don't recall anyone calling it a "sail powered" vehicle. The only thing it has in common with a sailboat is the power source: wind. That, however, puts it in an exclusive group that also includes our beloved sailboats.
No windvane either..
It did have telltails, streaming forward at first the rearward as the machine exceeded wind speed.
I know it's not a sailboat and may not be appropriate for this forum, I'm just a sucker for cleaver ideas and the people who see them through.
Will it ever have any use on a boat? Who know's? The future is full of surprises and someday we may find out that everything we know is wrong.