We gone over and over this but once more for the very last time tracking ships are not outrunning the wind as wind is a vector force and when tracking there is indeed wind over the sailing ship in question during most of the tracking even when the scaler speed of the ship is greater then the wind speed. Hell even when you get an average vector in the wind direction most of the time you do have winds forces on the sail the majority of the time.
The car is going directly down wind not tracking little bit therefore it have zero wind in relationship to it at the speed of the wind at the point it hit wind speed at all times.
Zero wind mean zero force mean zero acceleration at wind speed and that mean the ship will not go over the speed of the wind.
So keep waving your hands in the air with tracking ships it not the same at all.
Sorry your hand waving is not working.
Even when the CAR is pointed straight, the SAILS of the car - the blades of the propeller - are CONSTANTLY tacking. It is the angle of the sail to the wind that matters.
Wind pressure and flow effects over the ground is not going to effect the car to any degree.
All that matter is the wind pressure on the car not the ground.
Let me switch the problem around for a second. I am traveling through space at a certain velocity. Along with me is a bowling ball. If I take the bowling ball and push it backwards, does anyone doubt that my forward speed will increase and the speed of the ball will decrease? This problem is similar in that the car and the air are moving forward together. When the prop turns, it is pushing back on the air so the car speeds up.
But is does demonstrate why it is important to have wind for this to work and why this doesn't violate the laws of thermodynamics. In still air, the car doesn't go at all and if you push it to get it started, it will stop. The additional energy it takes to go faster than the wind comes from taking energy from the air traveling along with the car, slowing the air and speeding up the car.