Quote from: wallofwolfstreet on 07/15/2015 02:33 pmQuote from: TheTraveller on 07/15/2015 04:22 amQuote from: WarpTech on 07/15/2015 03:56 amToddTodd,Any EMDrive theory must show the direction of the dielectric generated Force (Small to Big) at 180 deg opposite the non dielectric case (Big to Small) and the dielectric Force to be much weaker than the non dielectric case.Can your theory do that?Traveller, is it true that a tapered waveguide with a dielectric insert in the small end will thrust towards the big end, and that the same tapered waveguide without the dielectric will thrust toward the small end? Do I have that right?With that in mind, how does Shawyer's variable group velocity ==> variable radiation pressure theory explain this flipping thrust direction? The flipped Force direction is correct as per published experimental data from 4 experimenters as attachedAs far as I know, Shawyer never addressed the dielectric results in his theory, other than in the 2 relevant UK patents attached.So the field is wide open for you and others to have a go. Good luck.BTW your claimed that Shawyer's claim that variable group velocity (variable Guide Wavelength) generates variable radiation Force is a theory is not correct. Cullen 15 (attached) and waveguide physics proves it is correct.If you don't understand that please check out how Group Velocity and Group Wavelength are related Vg = c * (Lambda0 / Lambdag) Lambdag is the Guide Wavelength and it changes as the tapered waveguide diameter changes as the EM wave passes along the tapered waveguide.
Quote from: TheTraveller on 07/15/2015 04:22 amQuote from: WarpTech on 07/15/2015 03:56 amToddTodd,Any EMDrive theory must show the direction of the dielectric generated Force (Small to Big) at 180 deg opposite the non dielectric case (Big to Small) and the dielectric Force to be much weaker than the non dielectric case.Can your theory do that?Traveller, is it true that a tapered waveguide with a dielectric insert in the small end will thrust towards the big end, and that the same tapered waveguide without the dielectric will thrust toward the small end? Do I have that right?With that in mind, how does Shawyer's variable group velocity ==> variable radiation pressure theory explain this flipping thrust direction?
Quote from: WarpTech on 07/15/2015 03:56 amToddTodd,Any EMDrive theory must show the direction of the dielectric generated Force (Small to Big) at 180 deg opposite the non dielectric case (Big to Small) and the dielectric Force to be much weaker than the non dielectric case.Can your theory do that?
Todd
Quote from: TheTraveller on 07/15/2015 03:31 pmQuote from: wallofwolfstreet on 07/15/2015 02:33 pmQuote from: TheTraveller on 07/15/2015 04:22 amQuote from: WarpTech on 07/15/2015 03:56 amToddTodd,Any EMDrive theory must show the direction of the dielectric generated Force (Small to Big) at 180 deg opposite the non dielectric case (Big to Small) and the dielectric Force to be much weaker than the non dielectric case.Can your theory do that?Traveller, is it true that a tapered waveguide with a dielectric insert in the small end will thrust towards the big end, and that the same tapered waveguide without the dielectric will thrust toward the small end? Do I have that right?With that in mind, how does Shawyer's variable group velocity ==> variable radiation pressure theory explain this flipping thrust direction? The flipped Force direction is correct as per published experimental data from 4 experimenters as attachedAs far as I know, Shawyer never addressed the dielectric results in his theory, other than in the 2 relevant UK patents attached.So the field is wide open for you and others to have a go. Good luck.BTW your claimed that Shawyer's claim that variable group velocity (variable Guide Wavelength) generates variable radiation Force is a theory is not correct. Cullen 15 (attached) and waveguide physics proves it is correct.If you don't understand that please check out how Group Velocity and Group Wavelength are related Vg = c * (Lambda0 / Lambdag) Lambdag is the Guide Wavelength and it changes as the tapered waveguide diameter changes as the EM wave passes along the tapered waveguide.Were is the reaction in the graph, only thrust is shown. Terminology defining thrust, reaction, of a force, it's all messed up and confusing. Needs to be cleaned up to make sense. MHOShell
The force resulting from reflections of the guided electromagnetic waves in the end section containing the electrical material will be greater than the force resulting from reflections in the air or vacuum filled end section. The difference between these forces will give rise to a resultant thrust on the unit.
...Your theory that Group Velocity is not the velocity of momentum inside a waveguide and that the Group Velocity doesn't vary with diameter change is not correct.
Quote from: TheTraveller on 07/15/2015 03:39 pm...Your theory that Group Velocity is not the velocity of momentum inside a waveguide and that the Group Velocity doesn't vary with diameter change is not correct.Your complete misrepresentation of what I wrote stands most prominent among your frequent misrepresentations. I am glad that others can read and interpret for themselves what I wrote ( http://forum.nasaspaceflight.com/index.php?topic=37642.msg1404987#msg1404987 ) without your complete mis-quotation.
Inside a microwave waveguide Cullen has shown the bounce Force generated is reletative to the EM waves .....
Quote from: TheTraveller on 07/15/2015 04:12 amInside a microwave waveguide Cullen has shown the bounce Force generated is reletative to the EM waves .....May I have the title of this book or article? Was it in Modern Radio Science 1988? That's the only book I can find by him.Thanks.
I have a question:What is the most powerful microwave source that is available to private persons?And what is the maximum intensity that, say, copper can withstand without melting, exploding or whatever?Could we just buy a 1 MW+ microwave source build a frustrum resonator and see what happens?After seeking cover of course.Let us find a bored millionaire.This can't be too expensive. We don't have to optimize the system, which would become expensive at long term of course.Just apply the maximum power to a frustrum and check what will happen.
I have a question:What is the most powerful microwave source that is available to private persons? And what is the maximum intensity that, say, copper can withstand without melting, exploding or whatever?
Quote from: TheTraveller on 07/15/2015 04:22 amQuote from: WarpTech on 07/15/2015 03:56 amToddTodd,Any EMDrive theory must show the direction of the dielectric generated Force (Small to Big) at 180 deg opposite the non dielectric case (Big to Small) and the dielectric Force to be much weaker than the non dielectric case.Can your theory do that?At present, I am not modeling anything with a dielectric insert. I am only "attempting" to model a tapered waveguide "correctly", per Zeng and Fan. What I'm missing is, how much "power" is required, in the frame of the EM Drive, to make it go. What I'm getting is, a rocket equation with an "extra" term, dependent on the gradient of the potential energy and a non-linear equation that implies power consumption is reduced. However, after yesterdays misunderstanding, revelation and embarrassment. I am still trying to put all the pieces back together in a comprehendible way.The good news is, the discussion about the paradox cleared up a few things that will help me to finish the other paper correctly, but my question about F*vgroup for EM waves vs F*vphase for matter waves or propellant, still has me confused as to; Why are they different?Todd
So forget about Phase Velocity when dealing with EM waves inside a waveguide.
Quote from: DaCunha on 07/15/2015 05:37 pmI have a question:What is the most powerful microwave source that is available to private persons? And what is the maximum intensity that, say, copper can withstand without melting, exploding or whatever?Your difficulty isn't that the copper melts, instead you have arcing inside the waveguide and resonator. The gas (or lack thereof) inside the waveguide or cavity determines when this happens. Arcing happens more readily in vacuum than in air than in https://en.wikipedia.org/wiki/Sulfur_hexafluoride. The latter, Sulfur Hexafluoride, is used in large Van de Graaf generators to prevent arcing. The gas inside the resonator is a type of dielectric, so you'll have a change in the group velocity and other math to consider.To your other question, what is the largest size microwave source can you buy: Big. They are not controlled devices. If you accidentally melt a busload of people with one, that will likely change.The largest microwave sources I found were Gyrotrons. There is a company, "Gyrotron Technology Inc." that offers custom and semi-custom gyrotrons with remarkable microwave sources available. I have not reached out to them for pricing or capability details.
Quote from: deltaMass on 07/15/2015 11:10 amFirst, locate your eggs This is a Yoke, right?
First, locate your eggs
FYI:http://www.huffingtonpost.com/benjamin-t-solomon/a-propellantless-propulsi_b_7718408.html