You aren't understanding. The sails move at a quarter the rate of the vehicle. So when the vehicle is moving at twice the speed of the wind, the wind is still hitting the sails at one half the wind speed relative to the ground.
Uh, no, the sails move from the front of the vehicle to the rear in a straight line along a belt. The sails collapse on reaching the rear, so they can follow the belt under the vehicle and be pulled back up on reaching the front of the car. I created this model. If you don't understand, I suggest you create an animation to help you visualize it.
You literally can't understand this can you? The only speed of the sail that matters, is the speed when it is catching the wind. At that time it is moving wrt to the ground slower than the wind, so receives power from the wind, while the car is moving forward, faster than the wind.
Please create the animation. But if you think the velocity of the sail when it is folded up has anything to do with the problem, there is nothing anyone can say to you to help you understand, or.... you do understand, but you are not capable of acknowledging you have been wrong all this time. Even money, either way.
I can create an animation in my head and since I know the physics involved it will be consistent with reality.
You clearly are failing to understand the physics.
The sail move at a quarter of the vehicle speed when it is above the vehicle and at one and a quarter the vehicle speed when bellow the vehicle with average sail speed being exactly the speed of the vehicle.
That is what it means to move around the vehicle.
Since no balls can hit any part of the vehicle including the sail when their average speed is equal the vehicle kinetic energy can not increase thus speed can not increase.
You just failed both your physics test and your math test.
No sail is moving at the "average" speed, so that is completely irrelevant. The wind will impact the sail when it is moving at half the speed of the wind. When it is moving at any other speed, it is furled up and not impacted by the wind.
You literally do not understand physics... or more likely, you understand perfectly, but like playing your troll game.
Blah, blah, blah. The sail does not exceed the speed of the wind, so the equation applies perfectly.
On blackbird the sail exceeds wind speed when vehicle exceeds the wind speed as they do have the exactly same speed.
This is not a blackbird where you don't understand the physics. This is a different mechanism where you don't understand the physics.
Blah, blah, blah... you can't squirm your way out of this with your nonsense. None of that applies to a sail boat. This is just a sail boat geared to the car. Wind on sail, moving the car faster than the wind, while the sail moves slower than the wind. There is no energy storage bunkum like you want to apply to the Blackbird.
No sail boat or sail vehicle can exceed wind speed directly downwind.
Any yet, they do, as proven by the multiple videos.
You have entered another realm of denial. I'm not going to continue to listen to your BS. I'm convinced that no one who claims to understand physics would not understand this simple model. So you must be trolling.