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#1
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'Impossible' EM drive may actually be impossible after all
"If something sounds too good to be true then it probably is, so goes the old
saying. And unfortunately, it now seems this is also applicable to the "impossible" EM drive, first touted over a decade ago as a way to generate thrust using microwaves, thereby eliminating the need for fuel in deep space exploration. The initial research caused huge excitement, with scientists venturing it would be possible to travel from Earth to Mars in just a few weeks if the technology could be scaled up, but new tests suggest that's unlikely to happen because it doesn't appear to work at all." See: https://www.engadget.com/2018/05/23/...ble-after-all/ |
#3
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'Impossible' EM drive may actually be impossible after all
In article , says...
On May/23/2018 at 4:38 PM, wrote : "If something sounds too good to be true then it probably is, so goes the old saying. And unfortunately, it now seems this is also applicable to the "impossible" EM drive, first touted over a decade ago as a way to generate thrust using microwaves, thereby eliminating the need for fuel in deep space exploration. The initial research caused huge excitement, with scientists venturing it would be possible to travel from Earth to Mars in just a few weeks if the technology could be scaled up, but new tests suggest that's unlikely to happen because it doesn't appear to work at all." See: https://www.engadget.com/2018/05/23/...ble-after-all/ Wow! Who could've guessed ;-) Shocking, not. An electrodynamic tether will produce a better result using the earth's magnetic field. Jeff -- All opinions posted by me on Usenet News are mine, and mine alone. These posts do not reflect the opinions of my family, friends, employer, or any organization that I am a member of. |
#4
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'Impossible' EM drive may actually be impossible after all
This research report appears to raise more questions.
Why is thrust produced? Without knowing the interior cavity field that causes thrust it is impossible to infer the field that will cause no thrust. Looking for cable forces is certainly an issue. But there are no reports of cable force. A cable drive needs to be tested evidently. |
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'Impossible' EM drive may actually be impossible after all
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'Impossible' EM drive may actually be impossible after all
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#7
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'Impossible' EM drive may actually be impossible after all
On 24/05/2018 6:38 AM, wrote:
"If something sounds too good to be true then it probably is, so goes the old saying. And unfortunately, it now seems this is also applicable to the "impossible" EM drive, first touted over a decade ago as a way to generate thrust using microwaves, thereby eliminating the need for fuel in deep space exploration. The initial research caused huge excitement, with scientists venturing it would be possible to travel from Earth to Mars in just a few weeks if the technology could be scaled up, but new tests suggest that's unlikely to happen because it doesn't appear to work at all." See: https://www.engadget.com/2018/05/23/...ble-after-all/ I don't know why so much effort has been put into something for which there was no credible theory of operation, and no evidence of significant forces. There was never any reason to think this thing would work. People whose inventions require a change in the accepted laws of physics to function should be expected to provide substantial evidence that those laws are wrong before anyone else wastes time on it. Sylvia. |
#8
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'Impossible' EM drive may actually be impossible after all
If you take an EMdrive cavity and measure the force with a spring
you have an anomaly drive. If you take the cavity and rotate it 180 degrees and still get the same force vector then the cavity effect is in question. The report in engadger appears to be cable force speculation as related to their unstated cable cavity configurations. |
#9
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'Impossible' EM drive may actually be impossible after all
In article ,
says... If you take an EMdrive cavity and measure the force with a spring you have an anomaly drive. If you take the cavity and rotate it 180 degrees and still get the same force vector then the cavity effect is in question. The report in engadger appears to be cable force speculation as related to their unstated cable cavity configurations. Engadget isn't that great of a site for space news, IMHO. Here's a better article at Ars Technica: SHIELDING?IMPORTANT, MMKAY? ? NASA?s EM-drive is a magnetic WTF-thruster Test reveals that the magic space unicorns pushing the EM-drive are magnetic fields. CHRIS LEE - 5/21/2018, 12:34 PM. https://arstechnica.com/science/2018...is-a-magnetic- wtf-thruster/ The best quote from above is: "The best part is that the results are the same when the attenuator is put into the circuit. In this case, there is basically no radiation in the microwave cavity, yet the WTF-thruster thrusts on." So, the German researchers have proven beyond a shadow of a doubt that the EM cavity has *nothing* to do with the "thrust" since they get the same "thrust" when replacing the EM cavity with an auttenuator (I'm guessing essentially a resistor). This is why the title of the article calls it a "magnetic WTF-thruster". Jeff -- All opinions posted by me on Usenet News are mine, and mine alone. These posts do not reflect the opinions of my family, friends, employer, or any organization that I am a member of. |
#10
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'Impossible' EM drive may actually be impossible after all
Early quests for the EMdrive were of a cylindrical cavity
filled with a dielectric coating. What does it mean when the asymetric EMdrive cavity is a form of "attenuator also? Maybe think of the general cavity as containing standing waves. And some form of waves as causing the noted force? Tuning the power frequency to maximize the percentage of power as standing wave is a cavity geometry affair. Power supply interaction with the Earth's magnetic field certainly needs addressing. See if it will rotate about like a Ferris wheel. Does the vertical magnetic field vector alter the performance? Also why not short the waveguide to look for power supply effect? |
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