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Impossible EM Thruster

An interesting “TOY” I stumbled on.  Reminds me of a device that T.Townsend Brown described in the late 1920s. His was a HV dc charged Crooks tube that moved in the direction of the positive charge during charging. Also described in a paper by Biefeld&Brown. pg

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NASA confirms ‘impossible’ thruster actually works, could revolutionize space travel
By Drew Prindle — August 1, 2014

Shawyer EM Drive test device

Shawyer EM Drive test device

When Roger Shawyer first unveiled his EmDrive thruster back around 2003, the scientific community laughed at him. They said it was impossible, that it was based on a flawed concept, and couldn’t work because it goes against the laws of conservation of momentum. But somehow, despite all of the reasons it shouldn’t work, it does. Shawyer’s engine provides thrust by “bouncing microwaves around in a closed chamber.” That’s it. There’s no need for a propellant of any kind like rocket fuel. When filled with resonating microwaves, the conical chamber of the thruster experiences a net thrust toward the wide end. These microwaves can be generated using electricity, which can be provided by solar energy. In theory, this means that the thruster can work forever, or at least until its hardware fails. Initially, the idea was met with criticism because it flies in the face of Newtonian physics, which dictate that no closed system can have this kind of net thrust. Shawyer, however, says that net thrust occurs because the microwaves have a group velocity that’s greater in one direction when Einstein’s relativity comes into play. But can it really? Apparently, yes. The idea was by a group of Chinese scientists back in 2009. They built their own version of Shawyer’s thruster and were able to produce 720 mili newtons of force — but even then, nobody really believed it.
Scientists at NASA just confirmed it;
Abstract: This paper describes the eight-day August 2013 test campaign designed to investigate and demonstrate viability of using classical magnetoplasma dynamics to obtain a propulsive momentum transfer via the quantum vacuum virtual plasma. This paper will not address the physics of the quantum vacuum plasma thruster, but instead will describe the test integration, test operations, and the results obtained from the test campaign. Approximately 30-50 micro-Newtons of thrust were recorded from an electric propulsion test article consisting primarily of a radio frequency (RF) resonant cavity excited at approximately 935 megahertz. Testing was performed on a low-thrust torsion pendulum that is capable of detecting force at a single-digit micro newton level, within a stainless steel vacuum chamber with the door closed but at ambient atmospheric pressure. Several different test configurations were used, including two different test articles as well as a reversal of the test article orientation. In addition, the test article was replaced by an RF load to verify that the force was not being generated by effects not associated with the test article. The two test articles were designed by Cannae LLC of Doylestown, Pennsylvania. The torsion pendulum was designed, built, and operated by Eagleworks Laboratories at the NASA Johnson Space Center of Houston, Texas. Approximately six days of test integration were required, followed by two days of test operations, during which, technical issues were discovered and resolved. Integration of the two test articles and their supporting equipment was performed in an iterative fashion between the test bench and the vacuum chamber. In other words, the test article was tested on the bench, then moved to the chamber, then moved back as needed to resolve issues. Manual frequency control was required throughout the test. Thrust was observed on both test articles, even though one of the test articles was designed with the expectation that it would not produce thrust. Specifically, one test article contained internal physical modifications that were designed to produce thrust, while the other did not (with the latter being referred to as the “null” test article). Test data gathered includes torsion pendulum displacement measurements which are used to calculate generated force, still imagery in the visible spectrum to document the physical configuration, still imagery in the infrared spectrum to characterize the thermal environment, and video imagery. Post-test data includes static and animated graphics produced during RF resonant cavity characterization using the COMSOL Multiphysics® software application. Excerpts from all of the above are included and discussed in this paper. Lessons learned from test integration and operations include identification of the need to replace manual control of the resonant cavity target frequency with an automated frequency control capability. Future test plans include the development of an automatic frequency control circuit. Test results indicate that the RF resonant cavity thruster design, which is unique as an electric propulsion device, is producing a force that is not attributable to any classical electromagnetic phenomenon and therefore is potentially demonstrating an interaction with the quantum vacuum virtual plasma. Future test plans include independent verification and validation at other test facilities. Publication Date: Jul 28, 2014 propulsive momentum transfer via the quantum vacuum virtual plasma. This paper will not address the physics of the quantum vacuum plasma thruster, but instead will describe the test integration, test operations, and the results obtained from the test campaign. Approximately 30-50 micro-Newtons of thrust were recorded from an electric propulsion test article consisting primarily of a radio frequency (RF) resonant cavity excited at approximately 935 megahertz. Testing was performed on a low-thrust torsion pendulum that is capable of detecting force at a single-digit micronewton level, within a stainless steel vacuum chamber with the door closed but at ambient atmospheric pressure. Several different test configurations were used, including two different test articles as well as a reversal of the test article orientation. In addition, the test article was replaced by an RF load to verify that the force was not being generated by effects not associated with the test article. The two test articles were designed by Cannae LLC of Doylestown, Pennsylvania. The torsion pendulum was designed, built, and operated by Eagleworks Laboratories at the NASA Johnson Space Center of Houston, Texas. Approximately six days of test integration were required, followed by two days of test operations, during which, technical issues were discovered and resolved. Integration of the two test articles and their supporting equipment was performed in an iterative fashion between the test bench and the vacuum chamber. In other words, the test article was tested on the bench, then moved to the chamber, then moved back as needed to resolve issues. Manual frequency control was required throughout the test. Thrust was observed on both test articles, even though one of the test articles was designed with the expectation that it would not produce thrust. Specifically, one test article contained internal physical modifications that were designed to produce thrust, while the other did not (with the latter being referred to as the “null” test article). Test data gathered includes torsion pendulum displacement measurements which are used to calculate generated force, still imagery in the visible spectrum to document the physical configuration, still imagery in the infrared spectrum to characterize the thermal environment, and video imagery. Post-test data includes static and animated graphics produced during RF resonant cavity characterization using the COMSOL Multiphysics® software application. Excerpts from all of the above are included and discussed in this paper. Lessons learned from test integration and operations include identification of the need to replace manual control of the resonant cavity target frequency with an automated frequency control capability. Future test plans include the development of an automatic frequency control circuit. Test results indicate that the RF resonant cavity thruster design, which is unique as an electric propulsion device, is producing a force that is not attributable to any classical electromagnetic phenomenon and therefore is potentially demonstrating an interaction with the quantum vacuum virtual plasma. Future test plans include independent verification and validation at other test facilities. Jul 28, 2014

Now, American scientists at NASA have given the EmDrive a go, and once again confirmed that it actually works. The test results were presented on July 30 at the 50th Joint Propulsion Conference in Cleveland, Ohio, and astonishingly enough, they are positive. The team behind the drive still doesn’t know why it works, just that it does……………By Drew Prindle — August 1, 2014

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Theory    EM Drive home site.
Principle of Operation
At first sight the idea of propulsion without propellant seems impossible. However the technology is firmly anchored in the basic laws of physics and following an extensive review process, no transgressions of these laws have been identified.
The principle of operation is based on the well-known phenomenon of radiation pressure. This relies on Newton’s Second Law where force is defined as the rate of change of momentum. Thus an electromagnetic (EM) wave, travelling at the speed of light has a certain momentum which it will transfer to a reflector, resulting in a tiny force.
If the same EM wave is travelling at a fraction of the speed of light, the rate of change of momentum, and hence force, is reduced by that fraction. The propagation velocity of an EM wave, and the resulting force it exerts, can be varied depending on the geometry of a waveguide within which it travels. This was demonstrated by work carried out in the 1950’s. (CULLEN, A.L. ‘Absolute Power Measurements at Microwave Frequencies’ IEE Proceedings Vol 99 Part 1V 1952 P.100)
Thus if the EM wave travelling in a tapered waveguide is bounced between two reflectors, with a large velocity difference at the reflector surfaces, the force difference will give a resultant thrust to the waveguide linking the two reflectors. If the reflectors are separated by a multiple of half the effective wavelength of the EM wave, this thrust will be multiplied by the Q of the resulting resonant cavity, as illustrated in fig 1 below.

Shawyer EM drive figure 01

Shawyer EM drive figure 1

Fig 1. Diagram of an engine concept.
The inevitable objection raised, is that the apparently closed system produced by this arrangement cannot result in an output force, but will merely produce strain within the waveguide walls. However, this ignores Einstein’s Special Law of Relativity in which separate frames of reference have to be applied at velocities approaching the speed of light. Thus the system of EM wave and waveguide can be regarded as an open system, with the EM wave and the waveguide having separate frames of reference.
A similar approach is necessary to explain the principle of the laser gyroscope, where open system attitude information is obtained from an apparently closed system device.

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10 responses to “Impossible EM Thruster

  1. p.g.sharrow October 2, 2014 at 10:15 pm

    Upon looking at this thing I see the possibility that the outside shape is as important as inside. When you excite a metal device the total thing “Rings” as far as the Aether is concerned. Most of the RF energy is trapped inside the wave guide but the guide itself “rings” to the tune inside. The field on the outside might be acting as a linear accelerator. The shape would cause a thrust vectoring and give “traction” in the Aether. pg

  2. Simon Derricutt October 3, 2014 at 3:37 am

    pg – it’s also possible that the measured force is a reaction against the walls of the containing chamber because of the resonant waves set up outside the device. To really be sure of this we’d need to set up a device in space and see if the force is still there at a large distance from any other object and with no (or very few) ions available. If it’s shown to work there, then it’s worth further tests and maybe installation in a satellite where such fuel-free propulsion would extend the life of the satellite enough to be worth the mass it takes.

  3. p.g.sharrow October 3, 2014 at 12:08 pm

    @Simon; It appears from my reading of the NASA abstract that 2 devices were tested, 1 that had internal parts that should have had increased thrust and 1 that should have had no thrust. Both tested on the work bench and as well as inside of the vacuum chamber at ambient air pressure. All tests indicated thrust. So……………… Ion thrust can not be ruled out from these tests. pg

  4. adolfogiurfa October 4, 2014 at 12:18 pm

    Energy-electricity- is pumped in…then energy is going out and this is force.

  5. p.g.sharrow October 4, 2014 at 8:57 pm

    @ALL; Many years ago I had a vision of a “Maser” thrust device. It was made of several layers of resonate chambers. Each layer was several chambers arranged in a radial pattern. The “thruster” had no outlet but “blew” force out the bottom, kind of like a laser blows light out the less reflective “bottom end” The only electrical connection was the whole thing “rang” at the individual chamber frequency. pg

  6. Simon Derricutt October 6, 2014 at 12:52 pm

    pg – if you had a hot mass at the focus of a parabolic mirror it would produce a thrust. The energy it radiates has momentum. It’s just a pitifully small amount of thrust, though over a period of years it would all add up and produce a measurable acceleration. There’s not really any need to have a resonator or a complex circuit – it’s just EM radiation we want, so get something really hot and it will radiate out more energy = more acceleration (and a lot less complex). Worth maybe looking at the wiki on “photon rocket” and “nuclear photon rocket” to get the formulae for the thrust and other interesting tidbits.

  7. p.g.sharrow October 6, 2014 at 7:14 pm

    @Simon, a good observation on the parabolic shape to enhance directional thrust. Our disk is a parabola of foils that has a focal point just below the disk edge bottom. I think the radiation we are looking for is more similar to a static charge then a hot photonic emission. Hard to tell, as this whole thing is on the edge of known science. pg

  8. Pingback: Classical Values » The Impossible Thruster

  9. Pingback: Is a Warp Drive possible | pgtruspace's blog

  10. quartz countertops bradenton fl June 3, 2016 at 3:12 am

    This is amazing!!! Definitely sharing and saving for later! 🙂

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