Re: On Arindam Banerjee's recoil-less rail gun and Newton's 3rd Law violations in electrodynamics

bertietaylor:

Aether Regained wrote:
 

Aether Regained:

@ArindamBanerjee
>
I took a look at your video of your 'recoil-less' rail gun:
>
My Movie8feb2022
>
https://www.youtube.com/watch?v=zYtyOMbgiZ0
>
My first impression was that, there is an obvious recoil of the 'gun' or
rails+supercapacitors section, but you claim in the description that:
>
"... we are creating momentum from internal energy/force in this
experiment. The heavy (3Kg) armature is accelerated by electromagnetic
forces. There is a recoil, the rest of the apparatus weighs 4.3Kg - BUT
THAT IS DUE TO THE FRICTION FROM THE ROLLING ARMATURE. ...  As I have
shown in my other videos, the force that accelerates the armature has
very little recoil, and this new effect can be used to make reactionless
motors for the proper conquest of space."
>
You have worked on this for a long time, but I think you are maybe
overlooking that whatever electromagnetic forces act on the current
flowing through the rolling bar/'armature', near [*] exactly opposite
electromagnetic forces will act on the other end of the rails, i.e., on
the oppositely flowing current through the supercapacitors, and the
center-of-mass of the whole system will remain near stationary.
>
[*] It is well known that in electrodynamics, Newton's 3rd law is
inexact, namely it will appear to be violated if the momentum in the
aether or em field is not also considered. I urge you to carefully read
FLP-II:26-2, especially the last paragraph, and also FLP-II:27-6 on the
(Electromagnetic) Field Momentum.
>
https://www.feynmanlectures.caltech.edu/II_27.html#Ch27-S6
>
"FLP-II:27-6: We pointed out in Section 26–2 the failure of the law of
action and reaction when two charged particles were moving on orthogonal
trajectories. The forces on the two particles don’t balance out, so the
action and reaction are not equal; therefore the net momentum of the
matter must be changing. It is not conserved. But the momentum in the
field is also changing in such a situation. If you work out the amount
of momentum given by the Poynting vector, it is not constant. HOWEVER,
THE CHANGE OF THE PARTICLE MOMENTA IS JUST MADE UP BY THE FIELD
MOMENTUM, SO THE TOTAL MOMENTUM OF PARTICLES PLUS FIELD IS CONSERVED."
>
I think it is premature to believe that your inconclusive results can be
the basis of a space motor. For that purpose, you may want to take a
look at PROJECT ORION:
>
https://en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion)
>
which is a design by the late Freeman Dyson, that works, and does not
involve continuously ejecting mass.
>

 

Just a clarifying addendum to the OP:

 

In light of:

 

https://www.feynmanlectures.caltech.edu/II_27.html#Ch27-S6

 
Irrelevant
 

"FLP-II:27-6: We pointed out in Section 26–2 the failure of the law of
action and reaction when two charged particles were moving on orthogonal
trajectories. The forces on the two particles don’t balance out, so the
action and reaction are not equal; therefore the net momentum of the
matter must be changing. It is not conserved. But the momentum in the
field is also changing in such a situation. If you work out the amount
of momentum given by the Poynting vector, it is not constant. HOWEVER,
THE CHANGE OF THE PARTICLE MOMENTA IS JUST MADE UP BY THE FIELD
MOMENTUM, SO THE TOTAL MOMENTUM OF PARTICLES PLUS FIELD IS CONSERVED."

 
Feynman does not believe in fields. He believes in particles of energy
following e=mcc=hv
Anyway his opinions are worthless in this context which is based upon
Maxwellian electrodynamics.
 

the correct momentum balance equation for Arindam's rail gun is:

 

(1) [rail gun momentum]_{backward} + [em field momentum]_{backward} =
[rolling bar momentum]_{forward} + [em field momentum]_{forward}

 
Wrong. There is forward momentum found experimentally with my later 2023
videos with their detailed analysis and graphs.
 

For a working space motor design, the following has to be satisfied:

 

(2) [rolling bar momentum]_{forward} >> [rail gun momentum]_{backward}

 
Which is tge case from my 2023 videos, the latest ones.
However as the bar rolls there is a significant backward monentum from
the friction upon the rails.
Sliding will lessen it.
 

or what amounts to the same thing:

 

(3) [em field momentum]_{backward} >> [em field momentum]_{forward}

 

I'm skeptical that for the given rail gun setup, (2) or (3) holds. Also,
it seems to me that, if all the energy in the supercapacitors were
expended in generating a laser pulse, it is more likely that (3) would
be achieved.

 
Check out my latest videos and the graphs. You should be able to find
them from my links in sci.physics. Or I will repost here.
 
Arindam Banerjee, for Bertie and Tyler, my faithful ghostly cyberdogs.

ElectroBOOM's take on the rail gun:

https://www.youtube.com/watch?v=NJRDclzi5Vg

On a more serious note, the laws of conservation of energy, linear
momentum and angular momentum are at the foundations of both classical
and modern physics. If you make the EXTRAORDINARY CLAIM that these have
been falsified, EXTRAORDINARY EVIDENCE will be demanded -- a lot more
than crude experiments, made with half assed or hardly any instrumentation.

Also, all the navy/military rail guns, such as the one below, have
enormous recoil/back reactions, when fired, as expected:

https://youtu.be/58MmOpSm4LY?t=66