12 times more output than input, dual mechanical oscillation system !

[Floor]

Yes.. what to eject ?

The ejected material / mass from a rocket remains ejected.  The ejected material / mass
from,  for example, from a solenoid ( the core) must  be returned to within the coil.

[kolbacict]

And what is the second pendulum for us?  It himself goes into our hands.And in needed place.
This will be our discarded mass.  And it also wants to be pushed in the opposite direction. The benefit is twofold.

[Floor]

I think perhaps it IS actually a benefit (as Lanka pointed out),
but the same benefit (not two fold ?) but still a benefit.
... ... ... ... ... ...
Both pendulum bobs are accelerated by reactive force.
Both accelerations are to the benefit of the device's functioning.
... ... ... ... ... ...
Thrust could be a continuous magnetic force, although diminishing with distance.

I am not exactly clear on what that design would entail. Perhaps with both a curved
coil and a curved ejected core (and / or core is attracted into coil)
... ... ... ... ... ...
The next question is, how much of a benefit is it at lower speeds.

[lancaIV]

https://www.quantum-controls.co.uk/insights/faqs/what-is-cube-law/#:~:text=Cube%20Law%20is%20the%20relationship,can%20give%20significant%20energy%20savings.


the relationship between a (centrifugal pump or fans) speed and its energy need is known as Cube Law


from rotative to linear !?

[Floor]

https://www.quantum-controls.co.uk/insights/faqs/what-is-cube-law/#:~:text=Cube%20Law%20is%20the%20relationship,can%20give%20significant%20energy%20savings.


the relationship between a (centrifugal pump or fans) speed and its energy need is known as Cube Law


from rotative to linear !?

Ok / will check that out at some point here in.

If question 1 is how "much of a benefit is it at lower speeds".

Question 2 must be, how long can we continue with these mental gymnastics
before some one interrupts 

So then ...

If both rotor and stator of an electric motor are allowed to rotate
as output shafts how much does it increase the efficiency ?
                                    None?
Twice the speed half the force. Half the speed twice the force.
Same energy content, same energy consumption either way.
How does this apply to the pendulum bobs ?

The efficiency of a liquid driven turbine engine can be increased by means of
counter rotating blade sets. This is because energy transference from fluid to blade
can be improved (less waste). This is not because of simultaneous energy extraction
from both action and reaction, but rather, some characteristics of the liquid's flow.

Similar efficiency increases in gas turbines may be achieved through consecutive blade
sets, each tuned for efficiency in terms of the gas (to its density and velocity) as it is
arriving at the turbine blade set. Those characteristics / ratios of the gas were changed
due to having passed through the previous set of turbine blades. The next set is there
fore designed to maximize efficient energy transfer at the present gas speed and density.

The goal in terms of the rocket is high speed.  The goal here is to increase energy
content / efficiency.