Quote from: rfmwguy on 06/26/2015 05:47 pm...Thanks...quite confusing, I must admit in the early stages of this project...9.0 vs 10.2"L. Suppose the logical way to go is 10.2 since it will be far easier to reduce length than to add it. Rodal says 10.2, Aero sees resonance at 9.0. ...Well, my reading is that @aero is not confused on this, as he (apparently, from his last message) understood that I had showed you that there is resonance at 9.0 inches and there is resonance at 10.2 inches. So I don't understand why you state <<Rodal says 10.2, Aero sees resonance at 9.0>> The correct statement should read instead:<<Rodal states resonance at L=9.0 inches and at L=10.2 inches, Aero sees resonance at L=9.0 inches and aero has not yet run L=10.2 inches>>As far as I know @aero HarmInv has big issues with convergence, he has to add noise to get convergence in a finite time, and has to input a frequency very close to the answer to get an answer. So he has to know the answer in order to get an answer. And as far as I know he hasn't tried 10.2 inches yet, and he doesn't know what mode shape was his resonance at 9.0 inches. And to get resonance at 9.0 inches length, he had to input the same frequency and dimensions that I used to get resonance at 9.0 inches. So where is the confusion? To clarify @aero's result we must wait until he runs some more runs, so that he can see what mode shape he converged to, and to see what he gets with L=10.2 inches.
...Thanks...quite confusing, I must admit in the early stages of this project...9.0 vs 10.2"L. Suppose the logical way to go is 10.2 since it will be far easier to reduce length than to add it. Rodal says 10.2, Aero sees resonance at 9.0. ...
Quote from: WarpTech on 06/26/2015 04:59 pm...I've also found a mechanism to boost the force many times over that of a photon rocket, such that this little bit of energy that escapes may in fact be enough to cause the observed thrust. More when I finish the paper...ToddI would be interested to hear what component it could be that would multiply the thrust. Would there be that much more radiation emitted?
...I've also found a mechanism to boost the force many times over that of a photon rocket, such that this little bit of energy that escapes may in fact be enough to cause the observed thrust. More when I finish the paper...Todd
Quote from: dustinthewind on 06/26/2015 05:07 pmQuote from: WarpTech on 06/26/2015 04:59 pm...I've also found a mechanism to boost the force many times over that of a photon rocket, such that this little bit of energy that escapes may in fact be enough to cause the observed thrust. More when I finish the paper...ToddI would be interested to hear what component it could be that would multiply the thrust. Would there be that much more radiation emitted? When I've checked, rechecked, and validated my equations, I'll let you know. I ran a spreadsheet last night to determine the required stored energy for a given force. The numbers seem reasonable given the available data, "IFF" there were no plate on the big end and the flux could get out. With the big end sealed, the force is there, but it's cancelled at the big end. It's not going to do anything unless the flux can get out.One of the key issues I've tried to answer is, what is the drift velocity of an Xnm mode in a tapered cylinder cavity? In a straight cylindrical cavity, a resonant TExx mode at position "x" along the cylinder doesn't move down the pipe, it's velocity is zero and it's frequency doesn't shift due to it's position. In a cone it does.Todd
I don't recall whether or not I've posted this video, so here it is. I was fooling around back in April trying to create evanescent waves when I came across this very unusual pattern. I don't know that evanescent waves are involved at all but something unusual is showing up. You tell me? Superluminal velocity? Well, strange things do happen.
The only way these things will work is to interact with an outside environment. I believe I've figured out that this mechanism is the finite conductivity of copper + heat, allowing voltage drop to form on the conductor, AKA "Ohm's Law". Where there is voltage and current there are volt-seconds, or magnetic flux that is passing through that open window. So heat and poor conductivity allow flux to escape (tunnel) through the copper.
Quote from: aero on 06/26/2015 06:35 pmI don't recall whether or not I've posted this video, so here it is. I was fooling around back in April trying to create evanescent waves when I came across this very unusual pattern. I don't know that evanescent waves are involved at all but something unusual is showing up. You tell me? Superluminal velocity? Well, strange things do happen.Before you posted this, I was imagining a gasket material (O-ring) that "insulated" the big diameter plate from the inner wall of the frustum. Thought experiment was backwards flux flow very similar to the 2D movie you presented.Trick here would be storage and release of magnetic flux...hold on...flux capacitor...I think I just shot myself in the foot.
QuoteWhile I enjoyed Mr Ts infectious enthusiasm, many posts were repeats and reminded me of advocacy posts. There is a growing marketing industry out there that pays people for position statements on social media; sponsored advertising in the 21st century if you will. Not saying Mr T is one, but posters should avoid these traps...it is transparent to many. And yes, nicknames are fine but real names on formal papers is a must.Not just a "new paper" was promised but what was much more outlandish (and completely unneeded), it was claimed that the paper was going to appear in a "peer-reviewed journal" (apparently addressing the poster's self-perceived problem that none of Shawyer's prior publications ever appeared in peer-reviewed journals), that the paper "was under peer-review", and that, upon having the rare privilege of being able to read the paper before publication (a privilege that people usually keep in confidence and never disclose in a public forum), it was (again, without any need) claimed that the paper would "end all doubt" about the EM Drive.
While I enjoyed Mr Ts infectious enthusiasm, many posts were repeats and reminded me of advocacy posts. There is a growing marketing industry out there that pays people for position statements on social media; sponsored advertising in the 21st century if you will. Not saying Mr T is one, but posters should avoid these traps...it is transparent to many. And yes, nicknames are fine but real names on formal papers is a must.
Quote from: rfmwguy on 06/26/2015 06:47 pmQuote from: aero on 06/26/2015 06:35 pmI don't recall whether or not I've posted this video, so here it is. I was fooling around back in April trying to create evanescent waves when I came across this very unusual pattern. I don't know that evanescent waves are involved at all but something unusual is showing up. You tell me? Superluminal velocity? Well, strange things do happen.Before you posted this, I was imagining a gasket material (O-ring) that "insulated" the big diameter plate from the inner wall of the frustum. Thought experiment was backwards flux flow very similar to the 2D movie you presented.Trick here would be storage and release of magnetic flux...hold on...flux capacitor...I think I just shot myself in the foot. Looking forward to what Martin Tajmar is going to present regarding "side effects" of EM Drive measurements
Quote from: WarpTech on 06/26/2015 04:59 pmThe only way these things will work is to interact with an outside environment. I believe I've figured out that this mechanism is the finite conductivity of copper + heat, allowing voltage drop to form on the conductor, AKA "Ohm's Law". Where there is voltage and current there are volt-seconds, or magnetic flux that is passing through that open window. So heat and poor conductivity allow flux to escape (tunnel) through the copper.So, with the increased wall thickness of the baby EMDrive with respect to the cone size and power input, should we expect no meaningfully significant thrust measurements, or is the copper "transparent" to the tunneling flux?P.S. A corollary thought is: if the material matters to the flux escape, then should SeaShells' copper mesh EMDrive show increased performance in with respect to cone size and power input?
It strikes me that a string with variable thickness is easier to manufacture and much safer to use than DIY cavities and magnetrons...
. How do we excite the strings?
Quote. How do we excite the strings?http://www.ebow.com/home.php
Quote from: hhexo on 06/26/2015 05:27 pmIt strikes me that a string with variable thickness is easier to manufacture and much safer to use than DIY cavities and magnetrons...Proposal for an acoustic (imperfect) analogue of the EmDrive(defined as "an acoustic system storing energy in standing waves and with a variable refraction index along an axis")0. The basic idea is to take a string manufactured with a thickness following a linear gradient, and excite it until it resonates.1. How do we manufacture a string with variable thickness?- Take a steel E or B guitar string (non-wound) and set it on something that keeps it straight.- Take a spray can of transparent paint (the one used for fixing artwork).- Repeat:--- Spray the string with paint from start to end, but increasing traversal speed as you do so.--- Rotate the string slightly.After enough spraying, you'll get a thicker coating of paint on one side due to the gradient in the speed of spraying.2. One string doesn't store much energy, how do we optimize the setup to get more energy?Have a lot of strings, arranged parallel to each other in an array, with the same orientation.(this should be equivalent to a lot of EmDrives parallel to each other)3. How do we excite the strings?Blast white noise at them (the analogue of a magnetron?).Alternatively use magnetic fields, i.e. the inverse of what electric guitar pickups do.4. How do we NOT get lynched by an angry mob of neighbours due to all the noise?Do the experiments in an abandoned airfield or the desert.SAFETY ADVICE: Wear noise-cancelling headphones. In order to get a few Watts into the strings, you will produce a lot of noise.I don't know if an acoustic analogue of the EmDrive would move... but it would rock!
Apologies. My Area 52 = Section 4 remark was concerning the JANNAF conference in which Section IV covered propellentless systems. Not only did I make a weak joke, I made poor assumptions about how quotes worked within the forum.