Originally Posted by Ziggythewiz
It's just like a sailboat (which can go far faster than the wind) tacking. You generate a force perpendicular to the direction of the wind.
I couldn't resist this mind teaser. And I finaly admit you're right, it is possible. But not the way you explain it. A sailboat never exceeds the wind speed. It can only exceed the windspeed relative tot the water, only by going transvere of the wind direction. With the wind behind it, it can never exceed the wind speed.
But this thing works differently. Below the windspeed I guess it is just propelled by the wind, like a any object that gives resistance to the wind. Close to the windspeed it reaches an equilibrium. The resistance of the drivetrain is the same force as the wind.
And then I suddenly got it. Even if there is an equilibrium, the spinning wheels harvest the power that is created by those opposite forces. And from that point on, the turbine is powerd by the wheels, and gives an extra force upon the direction of the wind. Making it go faster.
Of course there is a limit, a new equilibrium where the power harvested out of the wind vs. the ground gets even with the increased resisitance of the moving vehicle.
So, the maximum speed is a function of the wind over land speed. And if that speed is zero, the maximum speed is also zero.
It's a brilliant vehicle. A mind teaser. Or a hoax.