Interesting news from Gilo's FaceBook feed, as attached.Links with the just posted slide from Roger where he states Gilo Industries Research is officially involved with SPR in solving the EmDrive's high Q acceleration issue.
... Place the clock time as real time (stuff) into the equations.dB/dt = E or dB/E = dt invert and get E/dB = 1/dt which is the rate of time. I know it is a rough approx.; you work it out.With a constant E field and a variable B field you should produce a specific 1/dt or rate of time (stuff), under specific conditions.Since they are all vectors, the resultant 1/dt is also in one direction. If the resulting 1/dt is different from the local one, you get a local differential in the rate of time i.e. the causal structure for motion. The problem is that any delta cannot be sustained i.e. it has to hit a plateau and then come back down, just as waves do.Since we are working with micro “waves”, we have to somehow sync the rise of the dB field with an external stable E field and then shut that E field for the fall of the B field, or the effect is cancelled.... and shutting the E field will of course induce (some) its own B field.... The B/dE = 1/dt should be equally possible...My 5 cents, Marcel,
Quote from: TheTraveller on 06/19/2017 11:05 pmInteresting news from Gilo's FaceBook feed, as attached.Links with the just posted slide from Roger where he states Gilo Industries Research is officially involved with SPR in solving the EmDrive's high Q acceleration issue.What are these "high Q acceleration" problems you've mentioned?
Quote from: R.W. Keyes on 06/19/2017 10:28 pmSome notes on my progress towards construction:When you have a hammer, everything looks like a nail. On the flip side of that nugget of wisdom, being adaptive gets the job done. In my case the hammer is a 3D printer of good quality and size, so I will be putting my thoughts into using it. Without going too much into the realm of plastics engineering, let me just say that for purposes other than EMdrive I am going to be printing in a much stiffer, tougher, higher-temp plastic than is normally used. I will be printing in Ultem 1010. This should enable me to overcome any issues with temperature and stiffness with the cheaper, more common ABS (but at a higher cost).Then there is the plating issue. While electroless plating of ABS is well documented, the same can't be said of Ultem. I'll have to get good at plating Ultem before I can dive into making a cavity out of it.Why not silver? Yes, it's only 6% more conductive. It's more expensive, but prohibitively so? I checked yesterday and the spot price of silver is $16.69/Ounce (I know I'd be paying more retail). Plating can produce a very thin layer, making the most out of that ounce, depending on surface area and plating thickness. Also, Plating can be restricted to the useful interior surface only, but I may want to plate the outside for better heat dissipation. And, speaking of heat, it is not just the increase in Q that the use of silver provides, but also of course reduction in waste heat, which not only causes measurement issues but could also deform lesser plastics such as ABS, or even, under high power, Ultem. In other news, my two LimeSDRs have arrived. I'll be doing some VNA tests on my existing 2.4 gHz antennas to get a feel for its capabilities before I tackle any EMdrive cavitities. Which I should do anyhow, as I have too many 2.4 gHz omnis and should sell off most of them (contact me if you are interested).And yes, I plan to do the plating myself. I've looked at electroless and it doesn't seem too difficult or dangerous.I plan on having ironed out the difficulties with plating of copper and /or silver on Ultem in a few months. This will enable me to not only try out my own cavity designs, but also take orders from others for their designs. I can't give exact figure on the cost yet, but my Ultem should be much cheaper than what is currently being offered in the 3D printing market.Other tidbits: skeptical but not dismissive of TT's claims, waiting for his paper & patent. Also, Arxiv's treatment of McCullough is bad but not atypical. I'll leave out my rants on the deficiencies of the current practice of science.Best,RWKI don't think you should bother with silver plating the outside. The convective thermal resistance dominates the overall thermal resistance (convective & conductive). You will actually slightly *increase* the conductive thermal resistance by doing a thin silver plating on the outside (due to increased path length), and more importantly, you will virtually eliminate any radiation to the environment. A better solution is a thin layer of lamp black paint. You will slightly increase the conductive thermal resistance (bad), but significantly improve the emissivity at long wavelength IR radiation caused by heating the test article (good).mh
Some notes on my progress towards construction:When you have a hammer, everything looks like a nail. On the flip side of that nugget of wisdom, being adaptive gets the job done. In my case the hammer is a 3D printer of good quality and size, so I will be putting my thoughts into using it. Without going too much into the realm of plastics engineering, let me just say that for purposes other than EMdrive I am going to be printing in a much stiffer, tougher, higher-temp plastic than is normally used. I will be printing in Ultem 1010. This should enable me to overcome any issues with temperature and stiffness with the cheaper, more common ABS (but at a higher cost).Then there is the plating issue. While electroless plating of ABS is well documented, the same can't be said of Ultem. I'll have to get good at plating Ultem before I can dive into making a cavity out of it.Why not silver? Yes, it's only 6% more conductive. It's more expensive, but prohibitively so? I checked yesterday and the spot price of silver is $16.69/Ounce (I know I'd be paying more retail). Plating can produce a very thin layer, making the most out of that ounce, depending on surface area and plating thickness. Also, Plating can be restricted to the useful interior surface only, but I may want to plate the outside for better heat dissipation. And, speaking of heat, it is not just the increase in Q that the use of silver provides, but also of course reduction in waste heat, which not only causes measurement issues but could also deform lesser plastics such as ABS, or even, under high power, Ultem. In other news, my two LimeSDRs have arrived. I'll be doing some VNA tests on my existing 2.4 gHz antennas to get a feel for its capabilities before I tackle any EMdrive cavitities. Which I should do anyhow, as I have too many 2.4 gHz omnis and should sell off most of them (contact me if you are interested).And yes, I plan to do the plating myself. I've looked at electroless and it doesn't seem too difficult or dangerous.I plan on having ironed out the difficulties with plating of copper and /or silver on Ultem in a few months. This will enable me to not only try out my own cavity designs, but also take orders from others for their designs. I can't give exact figure on the cost yet, but my Ultem should be much cheaper than what is currently being offered in the 3D printing market.Other tidbits: skeptical but not dismissive of TT's claims, waiting for his paper & patent. Also, Arxiv's treatment of McCullough is bad but not atypical. I'll leave out my rants on the deficiencies of the current practice of science.Best,RWK
Quote from: RotoSequence on 06/20/2017 02:28 amQuote from: TheTraveller on 06/19/2017 11:05 pmInteresting news from Gilo's FaceBook feed, as attached.Links with the just posted slide from Roger where he states Gilo Industries Research is officially involved with SPR in solving the EmDrive's high Q acceleration issue.What are these "high Q acceleration" problems you've mentioned?"What limits thrust in high Q thrusters? Internal Doppler shift." as mentioned in presentation by Mr. Shawyer.
Quote from: Chrochne on 06/20/2017 06:07 amQuote from: RotoSequence on 06/20/2017 02:28 amQuote from: TheTraveller on 06/19/2017 11:05 pmInteresting news from Gilo's FaceBook feed, as attached.Links with the just posted slide from Roger where he states Gilo Industries Research is officially involved with SPR in solving the EmDrive's high Q acceleration issue.What are these "high Q acceleration" problems you've mentioned?"What limits thrust in high Q thrusters? Internal Doppler shift." as mentioned in presentation by Mr. Shawyer.Internal Doppler shift limiting Q doesn't actually make sense if you check the math. Lets just pick a Q of 1 million. This means a typical photon lifetime would be about 0.001 s. even at 1 g of acceleration, the total delta v over that time is only 0.01 m/s. Since opposite ends of the frustum would cause opposing Doppler shifts, only the total delta v matters and this is so small compared to the speed of light that the impact on frequency is negligible.Since all of Shawyer's theory so far has been nonsensical, here is an alternative guess at what led him to this most recent theoretically unsupported statement. He has probably found that the measured anomalous force from his thrusters has not been scaling with Q. This is expected, since based on all other emDrive experiments, his results are out of family, and therefore dominated by errors that would not scale with Q.
Quote from: meberbs on 06/20/2017 01:36 pmQuote from: Chrochne on 06/20/2017 06:07 amQuote from: RotoSequence on 06/20/2017 02:28 amQuote from: TheTraveller on 06/19/2017 11:05 pmInteresting news from Gilo's FaceBook feed, as attached.Links with the just posted slide from Roger where he states Gilo Industries Research is officially involved with SPR in solving the EmDrive's high Q acceleration issue.What are these "high Q acceleration" problems you've mentioned?"What limits thrust in high Q thrusters? Internal Doppler shift." as mentioned in presentation by Mr. Shawyer.Internal Doppler shift limiting Q doesn't actually make sense if you check the math. Lets just pick a Q of 1 million. This means a typical photon lifetime would be about 0.001 s. even at 1 g of acceleration, the total delta v over that time is only 0.01 m/s. Since opposite ends of the frustum would cause opposing Doppler shifts, only the total delta v matters and this is so small compared to the speed of light that the impact on frequency is negligible.Since all of Shawyer's theory so far has been nonsensical, here is an alternative guess at what led him to this most recent theoretically unsupported statement. He has probably found that the measured anomalous force from his thrusters has not been scaling with Q. This is expected, since based on all other emDrive experiments, his results are out of family, and therefore dominated by errors that would not scale with Q.This is interesting. However, when talking about "1g thrusters" Shawyer categorizes them as "low acceleration devices" compatible with primary in-orbit propulsion applications, deep space missions and lift engines for flying cars.When he talks about "high acceleration thrusters" on the other hand, and the Doppler shift issue, he rather points to a Q around one billion (1×109) and not one million (1×106) as well as accelerations comprised between 2 to 100g. Maybe you can find out there is indeed a problem with such numbers?
...it's simply magnetism and the associated field control.
Quote from: SeeShells on 06/20/2017 02:28 pm...it's simply magnetism and the associated field control.Pushing against other, local magnetic fields?
Thanks for the reminder that some people interpret million and billion differently. Yours are the ones I use.
When I say g, I am talking about gravitational acceleration (about 10 m/s^2). The between 2 and 100g you refer to would make more sense as grams of force.
Quote from: RotoSequence on 06/20/2017 03:07 pmQuote from: SeeShells on 06/20/2017 02:28 pm...it's simply magnetism and the associated field control.Pushing against other, local magnetic fields?No, not that simple as a pushing or local fields.Shell