EM Drive

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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Aero
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Re: EM Drive

Postby Aero » Tue Jan 13, 2015 4:53 pm

Aero

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Re: EM Drive

Postby GIThruster » Tue Jan 13, 2015 6:47 pm

Well, this is an interesting explanation for the thrust down at Eagleworks. I think you might consider sharing it with Paul March as well as Dr. Rodal over at NSF. While I'm unconvinced there is any thrust measured at all since they haven't yet provided any significant scientific controls--all released results thus far have been with no vacuum--it is certainly possible they are getting thrust, and it is not possible it is coming from QVF. So yeah, shoot Paul a note as well as Rodal as he is a very sharp guy who has given a lot of time to this.
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GIThruster
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Re: EM Drive

Postby GIThruster » Tue Jan 13, 2015 9:12 pm

Just glancing over the piece in wiki about evanescent waves, and I don't think this can generate thrust. For one thing is is non-radiative and only occurs when a wave is reflected inside a material. The wave is therefore limited to the interior of that materials, like a waveguide; and does not appear outside the waveguide, in empty space, etc.

So how could this possibly generate thrust, especially in space? Not seeing it.
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Re: EM Drive

Postby kunkmiester » Tue Jan 13, 2015 9:46 pm

So where is the extra energy to give a "superluminal" momentum without an FTL speed? I got your math, most articles on this stuff unfortunately use the higher formulas that can't really be understood without advanced calculus and they assume you know what a lot of variables and stuff mean.
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Re: EM Drive

Postby Aero » Tue Jan 13, 2015 11:21 pm

Aero

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Re: EM Drive

Postby GIThruster » Tue Jan 13, 2015 11:55 pm

It's not radiated energy. It stays within the waveguide. It is from reflection, and that reflection cannot occur where there is space, since in order to travel in space, you have to have a radiated form. At least that is my quick reading of this at wiki.
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Re: EM Drive

Postby Aero » Wed Jan 14, 2015 12:19 am

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Re: EM Drive

Postby kunkmiester » Wed Jan 14, 2015 12:37 am

Okay, lets see if I can get this written out properly. Don't know half the proper terms I probably should to say this, so bear with me.

If the velocity is more than C than you have to completely rewrite physics. So the "superluminal" wave is still traveling at C right?

But, if you simply add energy to a wave, you increase the amplitude or frequency, to increase the momentum. This isn't "superluminal" since everything still works out and the speed of propagation is still C.

So when you have an evanescent wave, that has "superluminal momentum" it has some extra energy somewhere, that's more energy than the wave should have, but isn't in the frequency or anything, or it wouldn't be "superluminal," but also doesn't add to the speed, or you'd violate the light-speed barrier and break physics.

So where is the extra energy to give it that momentum, or is it actually going faster than the speed of light? Or is this one of those things about the speed of light in the materials that make up the boundary that the wave propagates along, versus C, speed of light in a vacuum?

Am I making sense?
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Aero
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Re: EM Drive

Postby Aero » Wed Jan 14, 2015 2:10 am

Aero

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Re: EM Drive

Postby CellJeffe » Wed Jan 14, 2015 5:26 pm


Aero
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Re: EM Drive

Postby Aero » Wed Jan 14, 2015 7:09 pm

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Re: EM Drive

Postby Carl White » Fri Jan 16, 2015 10:37 pm


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Re: EM Drive

Postby birchoff » Sat Jan 17, 2015 5:26 am


GIThruster
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Re: EM Drive

Postby GIThruster » Sat Jan 17, 2015 2:50 pm

"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

Tom Ligon
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Re: EM Drive

Postby Tom Ligon » Sat Jan 17, 2015 3:42 pm

The paper definitely is contorted. Deliberate or sloppy? Dunno. But they admit that the effect is small and they can't explain it. Short answer, they're just messing around and would have no idea how to optimize this particular accident.

I see room for improvement in the apparatus, but the basic instrumentation is OK, if somewhat sub-optimal, and really needing to run at higher thrust and in a vacuum. But the torsion pendulum used is not too bad.

I'm in communication with Aero off-line, and what he has said here so far is just a glimpse. I'll leave it to him to describe his latest results when he is ready to. And I'll believe it when I get to build the working model and have it shoot off the lab bench.

As to operating in the atmosphere, another friend of mine is building an electric drive in his basement which is specifically intended for high thrust in the atmosphere. Does is use air to make thrust? Absolutely. What's wrong with that? Half the spaceflight problem is getting to LEO. But technologies that can only muster nanonewtons need not apply.

This field needs sound theory and sound testing. It would be a hoot if Talk Polywell provides both.


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