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#1160
by
Star One
on 25 Jun, 2019 06:49
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Has Seeshell abandoned her work on EM drive?
I believe so. There’s a post from her explaining why that I read sometime back.
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#1161
by
Mark7777777
on 25 Jun, 2019 10:50
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Has Seeshell abandoned her work on EM drive?
I believe so. There’s a post from her explaining why that I read sometime back.
I just messaged her inviting her to reply to the post.
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#1162
by
SeeShells
on 25 Jun, 2019 14:47
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Has Seeshell abandoned her work on EM drive?
I believe so. There’s a post from her explaining why that I read sometime back.
I just messaged her inviting her to reply to the post.
https://forum.nasaspaceflight.com/index.php?topic=45824.msg1856625#msg1856625Mark Twain wrote: “The report of my death was an exaggeration”.
My work continues and I've not given up or thrown in the towel. Slower and more focused, time and money make sure I need to get it right and prove or disapprove.
Monomorphic, NRL, Tajmar's team and even EagleWorks saw exactly what I suspected they would if the testing and test beds were built to a high standard. And that was a null report of thrust or thermal noise. I was convinced a couple years back that a steady state RF pumped into a enclosed device running at any mode would not produce anything resembling thrust other than artifact errors.
This is where I am, alive, slower and more focused.
All my best to all here...
Shell
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#1163
by
RERT
on 25 Jun, 2019 15:36
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My work continues and I've not given up or thrown in the towel....
Monomorphic, NRL, Tajmar's team and even EagleWorks saw exactly what I suspected they would if the testing and test beds were built to a high standard. And that was a null report of thrust or thermal noise. I was convinced a couple years back that a steady state RF pumped into a enclosed device running at any mode would not produce anything resembling thrust other than artifact errors.
...
SeeShells - Hi! It seems reasonable to ask what it is that you *are* focusing on, if not such an RF cavity?
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#1164
by
SeeShells
on 25 Jun, 2019 16:37
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My work continues and I've not given up or thrown in the towel....
Monomorphic, NRL, Tajmar's team and even EagleWorks saw exactly what I suspected they would if the testing and test beds were built to a high standard. And that was a null report of thrust or thermal noise. I was convinced a couple years back that a steady state RF pumped into a enclosed device running at any mode would not produce anything resembling thrust other than artifact errors.
...
SeeShells - Hi! It seems reasonable to ask what it is that you *are* focusing on, if not such an RF cavity?
If I go back into time in the Wayback Machine and review some of my past posts you'll see that I backed away from the steady state emdrive cavity.
I want to add all the pertinent links to posts I've done over the last couple years to show the progression from a steady state enclosed EMDrive cavity to what I'm working on currently. This will take some time . . . so hang in there.
I've wanted to do this for some time. I've 120 pages of my posts to dig through or you might want to browse through them as well.
https://forum.nasaspaceflight.com/index.php?action=profile;area=showposts;u=48229All My Best,
Shell
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#1165
by
PotomacNeuron
on 26 Jun, 2019 01:54
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#1166
by
RotoSequence
on 26 Jun, 2019 03:39
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If only it could work:
https://twitter.com/memcculloch/status/1143181254151610370
McCulloch is out of his mind to talk about 150N/kW. I thought he meant 150mN/kW.
Good grief. Maybe start with showing one mN/kW of non-thermal thrust, and let the ensuing physics revolution take care of the rest.
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#1167
by
zen-in
on 26 Jun, 2019 03:53
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My work continues and I've not given up or thrown in the towel....
Monomorphic, NRL, Tajmar's team and even EagleWorks saw exactly what I suspected they would if the testing and test beds were built to a high standard. And that was a null report of thrust or thermal noise. I was convinced a couple years back that a steady state RF pumped into a enclosed device running at any mode would not produce anything resembling thrust other than artifact errors.
...
SeeShells - Hi! It seems reasonable to ask what it is that you *are* focusing on, if not such an RF cavity?
If I go back into time in the Wayback Machine and review some of my past posts you'll see that I backed away from the steady state emdrive cavity.
I want to add all the pertinent links to posts I've done over the last couple years to show the progression from a steady state enclosed EMDrive cavity to what I'm working on currently. This will take some time . . . so hang in there.
I've wanted to do this for some time. I've 120 pages of my posts to dig through or you might want to browse through them as well.
https://forum.nasaspaceflight.com/index.php?action=profile;area=showposts;u=48229
All My Best,
Shell
Never give up trying. You may not achieve what you originally set out to achieve. Instead you might discover something new and totally unexpected.
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#1168
by
Robotbeat
on 26 Jun, 2019 03:57
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So if you're going to Proxima in ~10 years, you must be going at LEAST 41% c.
That means your kinetic energy in between is about 7,500,000,000 MJ/kg. That's approximately 100 times the energy density of your fission fuel. Are we ready to admit this (if it were real) could produce net energy gain, yet?
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#1169
by
Robotbeat
on 26 Jun, 2019 04:05
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I mean heck, if it's 150Newtons per kW, then just put it on a generator arm, start it spinning, and once it gets to, I don't know, 7-15 m/s or so, it could power itself!
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#1170
by
cvbn
on 27 Jun, 2019 01:40
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If only it could work:
https://twitter.com/memcculloch/status/1143181254151610370
McCulloch is out of his mind to talk about 150N/kW. I thought he meant 150mN/kW.
Good grief. Maybe start with showing one mN/kW of non-thermal thrust, and let the ensuing physics revolution take care of the rest.
He says what calculations show based on Taylor's paper (they assume that Unruh waves exist and can be easily damped with metal shields, which is very uncertain), but Whatever Will Be Will Be
.
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#1171
by
Tcarey
on 27 Jun, 2019 05:02
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My work continues and I've not given up or thrown in the towel....
...
Thanks for the reply. Glad to hear you are still at it in whatever form.
Looking forward to your results, whatever they may be.
Tom
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#1172
by
Monomorphic
on 27 Jun, 2019 20:44
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Schedule for the upcoming Second Foundations of Interstellar Studies Workshop:
https://www.fisw.space/newsNotice Sonny White on the second day "Dynamic Vacuum Model and Casimir Cavity Experiments."
Heidi Fearn will be there with Mike McCulloch.
I think Dr. Jeremy Munday is a young newcomer to advanced propulsion! You can see a recent presentation of his here:
EDIT: After watching the presentation, there was no mention of propulsion whatsoever.
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#1173
by
Ricvil
on 30 Jun, 2019 05:27
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It seems like a very fundamental idea and design, that one can adapt in unlimited ways, limited only by your imagination.
https://phys.org/news/2019-02-navy-patent-room-temperature-superconductor.amp
So this is not a superconductor. First of all, if it was its utility is killed by the fact that they have to keep vibrating it, and have it surrounded by a coil with a pulsed current running through it (Also, they have a pulsed current running through the supposed superconductor as well). This makes it an active device that consumes energy to run.
The claim that it would satisfy the perfect exclusion of magnetic fields because it is carrying a current and it is vibrating and would therefore exclude magnetic field lines from other magnets. This is a complete non-sequiter. It having its own magnetic field under its default state is not the same thing as reacting to the presence of an external magnetic field to generate a perfect exclusion of that field from its interior.
They also describe it as having a thickness of approximately the London penetration depth. They ignore that this depth is material dependent and use the depth for a different actual superconductor. Also, the London penetration depth is the thickness where about 60% of the external magnetic field is excluded (because you need some thickness of material, "perfect exclusion" has an asterisk on it in practice.) This means that their device is designed to be too thin to actually exhibit true superconducting properties.
Same US Navy scientist, Dr. Salvatore Cezar Pais:
Ph.D. Department of the Navy, Naval Air Systems Command (NAVAIR)/ Naval Air Warfare Center Aircraft Division (NAWCAD), NAS Patuxent River Maryland 20670,
filed two other patent applications that were previously been reported a few pages back by Freddled Gruntbuggly, but not discussed contrary to the 3rd patent. These two other patents are:
Unsure if this is on topic but the inventor of the above Room temp superconductor patent has a couple of others which appear to use microwave emitters and resonant cavities.
Gravity Wave Generator : https://patents.google.com/patent/US20180229864A1/en?inventor=Salvatore+Cezar+Pais
Craft using Inertial Mass Reduction Device : https://patents.google.com/patent/US10144532B2/en?inventor=Salvatore+Cezar+Pais
NextBigFuture website briefly talked about them two months ago.
Patents can be tricky to analyse, as they focus mainly on a list of claims, sketches and captions, but don't necessarily detail all fundamental hypotheses in a scientific point of view. Attached below, here are two papers from same Navy researcher, related to these patents. Perhaps it would be better to analyse these published papers instead of the patents.
• "The high energy electromagnetic field generator", Int. J. Space Science and Engineering, Vol. 3, No. 4, April 2016.
• "A hybrid craft using an inertial mass modification device", AIAA SPACE and Astronautics Forum and Exposition, Orlando, FL, September 2017.*
Your critical advice on these two papers is welcome.
* The 2017 AIAA SPACE Forum in Orlando was canceled at last minute due to hurricane Irma. However, paper were submitted and a similar document has been published a few days laters by the Society of Automotive Engineers (SAE International) as a technical paper (ref. 2017-01-2040) under the name "High Frequency Gravitational Waves - Induced Propulsion".
Patent granted.
https://sputniknews.com/science/201906291076101115-ufo-craft-technology-us-china/
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#1174
by
Monomorphic
on 30 Jun, 2019 18:55
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Patent granted.
From the patent:
"A high frequency gravitational wave generator including a gas filled shell with an outer shell surface, microwave emitters, sound generators, and acoustic vibration resonant gas-filled cavities. The outer shell surface is electrically charged and vibrated by the microwave emitters to generate a first electromagnetic field. The acoustic vibration resonant gas-filled cavities each have a cavity surface that can be electrically charged and vibrated by acoustic energy from the sound generators such that a second electromagnetic field is generated. The two acoustic vibration resonant gas-filled cavities are able to counter spin relative to each other to provide stability, and propagating gravitational field fluctuations are generated when the second electromagnetic field propagates through the first electromagnetic field."While this may technically create high frequency gravitational waves, they would be so minuscule that there would never be any hope in detecting them, much less using them to do work.
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#1175
by
Monomorphic
on 30 Jun, 2019 19:14
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I was investigating the ways a torsional pendulum can be fooled using Lorentz forces when I had the idea to build four short (10 cm) electrodynamic tethers that are supplied with ~1.25A of current each. In the ~45 uT geomagnetic field in my lab, that should produce ~22.5 uN of thrust. What I am really interested in is how tightly I can pack the 4 tethers and still produce usable thrust before they begin interfering with one another. The mount is adjustable so I can move the tethers closer to one another.
This will be my first working "propellantless thruster" as it is an electrodynamic thruster based on real physics. It will also provide us some data on Lorentz forces and how they influence torsional pendulums. The pendulum needs to be aligned certain ways, with current flowing certain ways before these forces become an issue.
I had to rotate the balance 180 degrees as the B-field at one end of the enclosure was distorted because of something in the wall. The B Field at the other end was oriented properly as shown below.
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#1176
by
Notsosureofit
on 01 Jul, 2019 18:24
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#1177
by
meberbs
on 01 Jul, 2019 18:42
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FYI: https://gizmodo.com/astronomers-spot-mysterious-10-million-light-year-long-1835301269
"Scientists have detected radio waves emanating from the space between a pair of galaxy clusters—evidence of intergalactic magnetic fields and fast-moving particles in the space between these giant galactic assemblages."
Why do people keep posting random unrelated articles in this thread? This is now twice it has happened in just over a week. I should be reporting this to moderator, but I don't like forcing them to read this section. Some self-moderation can be applied.
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#1178
by
Monomorphic
on 01 Jul, 2019 19:17
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Has anyone seen a calculation of the strength of inter- or intra- galactic fields as a propulsion mechanism ?
Interplanetary and intergalactic magnetic fields are very minuscule as B Fields obey the same inverse square falloff as gravity. Without huge improvements, electrodynamic thrusters would only be practical near the sun, in low Earth orbit, or for moving around the Jupiter system as Jupiter's magnetic field is 20,000 times the strength of the Earth.
As an example, the 22.5 uN thruster above would only generate ~0.022 uN in interplanetary space, but as much as 0.44 Newtons in low Jupiter orbit!
EDIT:
The field from a dipole magnet falls off as 1/r3 rather than 1/r2.
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#1179
by
trm14
on 01 Jul, 2019 20:14
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...as B Fields obey the same inverse square falloff as gravity...
No, unless you have found a magnetic monopole
