Dude, you are psychotic. You really think anyone can't see your BS? Don't switch to anything. Stick to the wind since that is what's happening. You can't grasp how to manipulate the model to agree with your claims, so you have to change them.
You have done this every time. You have misrepresented the facts many, many times and you continue to refuse to see reality.
Ok, that's on you. The rest of us understand what is happening.
I feel sorry for your employers.
Hopefully others can provide their understanding.
Your vehicle when moving at 10ms direct downwind with a 5m/s wind will experience a 5m/s (10m/s - 5m/s)
headwind.
No air particle will be able to hit the back of the sail in order to power the vehicle.
You just forget what powers this vehicle. No air particle hitting the back of the vehicle (this includes the sail) no forward acceleration.
It is useful to think in terms of balls as that will be a non compressible fluid equivalent and you will realize that without energy storage it can not work.
It is a limitation that you have not allowing you to deal with multiple variable changing at the same time. That is a bit strange based on your user name.
You refuse to understand that sails move around the vehicle and you imagine an infinite long belt so sails never need to go under the vehicle.
Maybe it helps if you take a few points to build a graph
wind speed always 5m/s
Vehicle speed:
0m/s air molecules hit the back of the sail at 5m/s so most wind power
1m/s air molecule hits the back of the sail at 4m/s while the sail hits back at 0.75m/s total collision speed 4.75m/s
2m/s air molecule hits the back of the sail at 3m/s while sail hits back at 1.5m/s total 4.5m/s
3m/s air molecule hits the back of the sail at 2m/s while sail hits back at 2.25m/s but this point is already impossible for your vehicle to accelerate in a non compressible fluid.
If it is a compressible fluid from this point the vehicle is powered by the energy it stored up to this point.
It will be an inferior design to blackbird so max speed will be lower but I understand the reason you think this is easier to understand but is just not what you think it is.
And I can ignore the fact that vehicle is no longer power by wind and just continue to calculate what will happen with air particles assuming vehicle can advance forward by magic or an internal energy source
4m/s air molecules will hit the back of the sail at 1m/s and sail will sit back at 3m/s
5m/s air molecule can no longer hit the air molecule but if there are air molecules in between those sails it could push them out at 4m/s using the magic or on board energy source.
6m/s air molecule will travel from front of the vehicle to the back at 1m/s so those air molecules ending between sails can be pushed out by the sails that will hit them at just 3.5m/s (sails move at 4.5m/s but the air molecule already travels in the same direction at 1m/s).
7m/s air molecules move at 2m/s and so (5.25 - 2)= 3.25m/s (air particle hit by the propeller).
8m/s air molecules move at 3m/s and so (6-3) = 3m/s
9m/s air molecules move at 4m/s and so (6.75-4) = 2.75m/s
10m/s air molecules move at 5m/s and so (7.5-5) = 2.5m/s
Do you understand that if the air molecule hits the vehicle/sail at higher speed than the sail hits back you get some net energy form the air molecule to accelerate your vehicle and if the sail hits the vehicle then your vehicle needs some other energy source as it is no longer powered by wind.