Just admit that you all got filtered by your fundamental misunderstanding of the concept of reference frames.
https://backend.orbit.dtu.dk/ws/portalfiles/portal/3748519/2009_28.pdf4. Conclusions
By applying basic concepts from mechanics and
fluid mechanics we have derived the equations
applicable for the performance of vehicles
“powered” by a difference in velocity between two
media. A myriad of intriguing results emerge from
these relations.
• It is theoretically and practically possible
to build a wind driven car that can go
directly upwind (using a generator/wind
turbine in the air).
• The rotor design for this type of vehicle is
generally substantially different than an
ordinary wind turbine design. Only in the
case of a car with a very low top speed
will the rotor design tend to the usual
wind turbine design case.
• It is theoretically possible to build a wind
driven car that can go in the downwind
direction faster than the free stream wind
speed (using a propeller in the air)
• It is theoretically possible to build boats
that will do the same as the two above
vehicles.
• There does not exist a definitive upper
limit for vehicles of this kind. As long as
efficiencies are improved, the velocities
will increase unasymptotically.
• Using a part of the power produced on a
wind turbine to propel itself against the
wind, it is theoretically possible to
increase the net power output. Also in
this case without an asymptotic upper
limit.
See bullets 3-5
