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#1140
by
Eusa
on 11 Apr, 2016 20:02
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Another paper using gravitation relativity (this time using a scalar-tensor theory) to justify the claims of anomalous force for the EM Drive is the one by Minotti, published in the more prestigious peer-reviewed journal Grav. & Cosmol:
Scalar-tensor theories and asymmetric resonant cavities
Fernando O. Minotti
Grav. & Cosmol. 19 (2013) 201
DOI: 10.1134/S0202289313030080
http://arxiv.org/abs/1302.5690
The problem with the theory is that it leads to gravitational effect due to magnetism that are dissonant with measurements around the Earth's magnetic field. Minotti proposes that a nonlinear theory may address this discrepancy. Minotti does an excellent job (compared to other authors) of discussing the exact solution for the electromagnetic fields in the truncated cone cavity.
Please let us know what you think of this paper vis-a-vis your theory.
I have not so much to say. Minotti's premises are so different from mine. I think the basis must be directly at the einsteinian general relativity that my theory aims to be. Still I'm exploring the conversion from tensor theory to scalar theory but remaining the premises as pure relativistic. My work is just about to begin.
I see Minotti's work is studious but unfortunately on erronous tracks. Still, there are some encouraging ways to perceive issue for example as standing (optical) waves in the truncated cone but not so organized as in my solution.
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#1141
by
FattyLumpkin
on 11 Apr, 2016 20:10
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thank X_Ray, can you double check the dims you put into FEKO---the design you have appears too tall
Large diameter = 10.0 cm, Small diameter = 5.682 cm and Height = 8.182cm down scale of the NASA
frustum by a factor of . 2794
Thanks, FL
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#1142
by
X_RaY
on 11 Apr, 2016 20:16
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thank X_Ray, can you double check the dims you put into FEKO---the design you have appears too tall
Large diameter = 10.0 cm, Small diameter = 5.682 cm and Height = 8.182cm down scale of the NASA
frustum by a factor of . 2794
Thanks, FL
I deleted my post since I realized that I have mixed up the height and the big base of your dimensions in my feko model. I had to convert it into mm, after that I copied the wrong sequence. The pic below looks better now. I will post more corrected results tomorrow.
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#1143
by
Monomorphic
on 11 Apr, 2016 20:34
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Even painted matte black, the copper behaves differently than other materials. Notice how my hand leaves no heat print, but it does on the table surface. Perhaps IR is penetrating the 1 coat of paint and I need more. What do you all think?
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#1144
by
Monomorphic
on 11 Apr, 2016 20:53
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#1145
by
rfmwguy
on 11 Apr, 2016 20:59
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Even painted matte black, the copper behaves differently than other materials. Notice how my hand leaves no heat print, but it does on the table surface. Perhaps IR is penetrating the 1 coat of paint and I need more. What do you all think?
Interesting! Would have guessed a thermal handprint. Really conducts out evenly.
Copper is an ideal heat spreader for your chip as well.
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#1146
by
Monomorphic
on 11 Apr, 2016 21:09
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Interesting! Would have guessed a thermal handprint. Really conducts out evenly.
I took an IR image shortly after finishing the large end solder. So I know heated copper, even unpainted copper, can show up on the IR camera. I think the temp differential needs to be higher than the background IR.
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#1147
by
tchernik
on 11 Apr, 2016 21:14
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Monomorphic:
That surely is a good looking Emdrive!
Thanks for the updates.
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#1148
by
rfmwguy
on 11 Apr, 2016 21:19
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Interesting! Would have guessed a thermal handprint. Really conducts out evenly.
I took an IR image shortly after finishing the large end solder. So I know heated copper, even unpainted copper, can show up on the IR camera. I think the temp differential needs to be higher than the background IR.
Looks interesting. My copper clad heated up on the IR, and only hotspots were around base of mag.
Side walls were mesh, so no thermal rise. Look forward to a static thermal fire-up, you should probably get to around 175 C at core of magnetron, dropping to around 140 around the frame. Be interesting to see top to bottom temp difference of endplates. Nice work!
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#1149
by
FattyLumpkin
on 11 Apr, 2016 22:00
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X_Ray, just for the heck of it why not try 5.2538 GHz which is the calculated "up-scaled" frequency
1.8804GHz x 2.794=5.2538 GHz
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#1150
by
Monomorphic
on 11 Apr, 2016 22:44
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I am thinking of using steel wool in the constant diameter tuning section to act as a EM gasket in case of any leakage around the small end-plate.
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#1151
by
rfmwguy
on 11 Apr, 2016 23:22
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Any loose fibers dropping down into the cavity will arc. Alternatively, you can usually pick these up at any store:
100% Copper mesh scouring pads. Also humbly suggest another copper plate on top of them to flatten and press outwards.
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#1152
by
Monomorphic
on 11 Apr, 2016 23:40
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Also humbly suggest another copper plate on top of them to flatten and press outwards.
Great idea, and very doable with this design. Thanks!
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#1153
by
MazonDel
on 11 Apr, 2016 23:56
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I'm not sure what the capabilities of your thermal camera are Monomorphic, but a few threads ago there was some discussion about how some DIYers IR cams have auto scaling enabled. That may or may not be happening with yours as I think I can see it do a scale shift a few times in your video.
Try without it if you can, if your camera does not have the ability to let you turn it of, one proposed way to "lock" in the scale was to have a large ice cube or glass of ice water AND something like a lit candle in the same shot. That should fix your upper and lower bounds to relatively unchanging temperatures and might help with visualization.
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#1154
by
masterharper1082
on 12 Apr, 2016 00:44
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I'm not sure what the capabilities of your thermal camera are Monomorphic, but a few threads ago there was some discussion about how some DIYers IR cams have auto scaling enabled. That may or may not be happening with yours as I think I can see it do a scale shift a few times in your video.
Try without it if you can, if your camera does not have the ability to let you turn it of, one proposed way to "lock" in the scale was to have a large ice cube or glass of ice water AND something like a lit candle in the same shot. That should fix your upper and lower bounds to relatively unchanging temperatures and might help with visualization.
Our older FLIR definitely had the ability to lock in the temperature range. Very important for generating consistent results from test to test.
Sent from my SM-T710 using Tapatalk
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#1155
by
Monomorphic
on 12 Apr, 2016 01:14
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Our older FLIR definitely had the ability to lock in the temperature range. Very important for generating consistent results from test to test.
Mine has that ability too. While it didn't help with the heat hand-print, I was able to confirm IR reflecting through the 1 layer of flat black paint.
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#1156
by
Bob Woods
on 12 Apr, 2016 03:04
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Even painted matte black, the copper behaves differently than other materials. Notice how my hand leaves no heat print, but it does on the table surface. Perhaps IR is penetrating the 1 coat of paint and I need more. What do you all think?
While not clear, the temp reading shows an increase on both the copper and the table. Looks like the heat conductivity of the copper is much higher (as would be expected) thereby radiating heat to the adjacent metal. Table top not as good a conductor only slowly transfers heat.
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#1157
by
Monomorphic
on 12 Apr, 2016 15:26
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Also humbly suggest another copper plate on top of them to flatten and press outwards.
Definitely a lot cleaner. Lowes had the copper scouring pads in a different location than the rest of the metal wool.
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#1158
by
Rodal
on 12 Apr, 2016 17:19
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Also humbly suggest another copper plate on top of them to flatten and press outwards.
Definitely a lot cleaner. Lowes had the copper scouring pads in a different location than the rest of the metal wool.
Are you also planning to paint the end plate(s ? , particularly the non-adjustable
big end) with flat-finish black paint (the same way as you did for the side-walls), so that you can scan them (using the same emissivity setting) with the infrared camera to tell the mode shape ?
The mode shape on the adjustable small end may NOT be readily captured because the inner plate will be the one induction heated. The exterior end plate on the small end will not be representative of the inner electromagnetic field in the cavityThat is a drawback from using an adjustable end: it does not allow accurately reading the mode shape on that end (with an infrared thermal camera).
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#1159
by
X_RaY
on 12 Apr, 2016 17:44
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Also humbly suggest another copper plate on top of them to flatten and press outwards.
Definitely a lot cleaner. Lowes had the copper scouring pads in a different location than the rest of the metal wool.
Looks good
One question, in the horizontal position the tuning apparatus may lead to problems.. Do you use a spring between the inner and the outer end plate? Or did you solve this mechanical problem with another solution?
