I will attempt to answer any questions you may wish to ask to the best of my ability.
string will apply restoring force to the body when it is not in rest position. this applies to both directions
force pairing would suggest that the body would counter rotate when the rotor arms are accelerating which it does not.
I understand your comments concerning the string, but the amount of restoring force in the string would have to be quite considerable for it to produce the end reaction
, and as I have earlier mentioned, the device works equally well when placed on a thrust bearing so that there is no restoring force at all since it is not attached to a string.
If you hold a slinky with an outstretched arm and allow it to fully extend so that the end of the slinky is around a foot from the floor, when you let go of the slinky you will observe that the bottom of the slinky 'levitates' for a moment and defies gravity.
The time of the counter rotation can be varied depending on how far the magnets are placed down the tube, i.e. with no magnets the body will counter rotate many turns. It is the collapse of the torque reaction when the magnetic interactions begin that enables the swinging process.
However, we can use your four seconds for a thought experiment. Imagine we take the device into deep space where the external friction is approx -22kg/m^3.
As you have noted, the body's counter rotation will last for four seconds,
A thrust bearing, as you have noted, will apply friction to the device as long as the device is moving. A bearing can apply resistance to movement, but to the best of my knowledge can not exert a restoring force to the device.
As for usefulness, please refer to the thought experiment, i.e. transfer of energy/momentum from battery to the device.
Yes, acceleration of rotor arms every quarter turn after load collapse.
You are probably going to have to draw a diagram to clarify what you are talking about here.If you cannot visualize what will happen without the magnets, I don't think the diagram is going to help.
Also, magnetic interactions have nothing to do with why the body portion comes to a stop in your video.This statement is illogical; if the magnets are taken away then it is impossible for the body to remain in its rest position. Also, if you are to make such as statement, could you at least add support to your argument. However, at least we have made progress in that you do recognize that the body does stop.
Why does it matter if it is a restoring force? It still applies a torque to the device which is where it gets its net angular momentum before you turn it off.The lack of a restoring force is everything - for the body to remain stationary, it is unable to overcome the friction of the thrust bearing.
"load collapse" is not a phrase that has any meaning here.Also, you say "yes" to it being the initial acceleration, but then you say "every quarter turn" which implies you are using "acceleration" to refer to the jerky part of the motion.This pedantic manner is helping no one. I do not wish to be like two bald men fighting over a comb. So, if we could move on and maybe find some common ground.
Therefore, if I can ask a question, is it theoretically impossible for the rotor arms to accelerate (in the jerky bit) without applying an opposite force to the body?