3 ms·

I've read the abstract, but apparently Wired has access to more information. Any idea where the primary source for that information is? I'm interested to see w

I've read the abstract, but apparently Wired has access to more information. Any idea where the primary source for that information is? I'm interested to see what magnetic shielding was used and how well they characterized the magnetic field in the experimental volume. There was a mention of shielding against electromagnetic effects, but that could just mean a Faraday cage or Helmholtz coils, neither of which will reduce the B-field to zero. Because the device is based upon microwaves in a conducting cavity, I would think that the first place to look for a theory of operation would be E&M, not quantum. The level of force involved is the kind that you can see when interacting with the Earth's magnetic field. Normally we ignore the force produced by the interaction of currents with the Earth's field, because they are so small. Was a mu-metal shield used, and if so, what was the remnant field? Was a stronger field induced to see if that increased the force? I hope that the experimenters try this if they have not already.

danbruc 12y ago
http://www.libertariannews.org/wp-content/uploads/2014/07/AnomalousThrustProductionFromanRFTestDevice-BradyEtAl.pdf http://www.libertariannews.org/wp-content/uploads/2014/07/An...
- FiatLuxDave 12y ago
  Thank you! It's always best to read the actual paper. I note that not only is there no shielding to reduce the Earth's magnetic field, but there are large NeFeB magnets in the torsion balance assembly. I strongly suspect that the "missing momentum" is going into the object producing the magnetostatic fields which lie in the RF cavity, whether that be the Earth or the damping magnets. Not to say that this wouldn't be interesting (RF interaction with magnetostatic fields), but I don't think this has met the level of proof required of a claim of violation of momentum conservation.
  - XorNot 12y ago
    Or the more obvious conclusion, which is Wired don't know how to read a paper, and nowhere in the actual experimental section do they say they pumped down the apparatus when they were actually testing.
seventytwo 12y ago
Yep, this is probably the first thing to examine, if repeatability is achieved.

danbruc 12y ago

http://www.libertariannews.org/wp-content/uploads/2014/07/AnomalousThrustProductionFromanRFTestDevice-BradyEtAl.pdf http://www.libertariannews.org/wp-content/uploads/2014/07/An...

FiatLuxDave 12y ago
Thank you! It's always best to read the actual paper. I note that not only is there no shielding to reduce the Earth's magnetic field, but there are large NeFeB magnets in the torsion balance assembly. I strongly suspect that the "missing momentum" is going into the object producing the magnetostatic fields which lie in the RF cavity, whether that be the Earth or the damping magnets. Not to say that this wouldn't be interesting (RF interaction with magnetostatic fields), but I don't think this has met the level of proof required of a claim of violation of momentum conservation.
- XorNot 12y ago
  Or the more obvious conclusion, which is Wired don't know how to read a paper, and nowhere in the actual experimental section do they say they pumped down the apparatus when they were actually testing.

seventytwo 12y ago

Yep, this is probably the first thing to examine, if repeatability is achieved.