Quote from: rfmwguy on 08/04/2015 09:50 pmQuote from: deltaMass on 08/04/2015 08:55 pmQuote from: rfmwguy on 08/04/2015 06:32 pmQuote from: X_RaY on 08/04/2015 06:26 pmQuote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />Ha! Let me guess - it's the reason you bought the house Just lucky...I had sworn off electronics several years ago, built computers, ham repeaters, direction finding equipment, hifi speakers, amps, etc...kinda missed the smell of a hot soldering iron Me too. I always had a workshop and in the last few years all those toys have gathered dust. I didn't know until I started this project how much I missed it. I should have never hung up that soldering iron.Got this beautiful sheet of copper in from https://www.onlinemetals.com/merchant.cfm?pid=15244&step=4&showunits=inches&id=966&top_cat=87 Took me a 1/2 hour to unbox it. @ .032 thick it will make a great frustum.Shell
Quote from: deltaMass on 08/04/2015 08:55 pmQuote from: rfmwguy on 08/04/2015 06:32 pmQuote from: X_RaY on 08/04/2015 06:26 pmQuote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />Ha! Let me guess - it's the reason you bought the house Just lucky...I had sworn off electronics several years ago, built computers, ham repeaters, direction finding equipment, hifi speakers, amps, etc...kinda missed the smell of a hot soldering iron
Quote from: rfmwguy on 08/04/2015 06:32 pmQuote from: X_RaY on 08/04/2015 06:26 pmQuote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />Ha! Let me guess - it's the reason you bought the house
Quote from: X_RaY on 08/04/2015 06:26 pmQuote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />
Quote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />
<lurk />
Quote from: TheTraveller on 08/04/2015 04:26 pmQuote from: Notsosureofit on 08/04/2015 04:21 pmFYIhttp://arxiv.org/pdf/1507.05828.pdfhttp://arXive.org/pdf/1311.1095.pdf2nd link is deadhttp://arxiv.org/pdf/1311.1095.pdftry
Quote from: Notsosureofit on 08/04/2015 04:21 pmFYIhttp://arxiv.org/pdf/1507.05828.pdfhttp://arXive.org/pdf/1311.1095.pdf2nd link is dead
FYIhttp://arxiv.org/pdf/1507.05828.pdfhttp://arXive.org/pdf/1311.1095.pdf
{snip}It has become obvious to me the EM-drive is bogus science. I don't believe anything Mr. Shawyer claims. The Eagleworks project just got less and less "thrust". Yang doesn't want to discuss the research she did. Maybe the Chinese authorities see a benefit in using it for a misinformation campaign, akin to the USAF UFO hoax of the 50's. So I don't think it is worth polluting RF spectrum anymore with this pointless activity.
Quote from: SeeShells on 08/04/2015 11:13 pmQuote from: rfmwguy on 08/04/2015 09:50 pmQuote from: deltaMass on 08/04/2015 08:55 pmQuote from: rfmwguy on 08/04/2015 06:32 pmQuote from: X_RaY on 08/04/2015 06:26 pmQuote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />Ha! Let me guess - it's the reason you bought the house https://www.onlinemetals.com/merchant.cfm?pid=15244&step=4&showunits=inches&id=966&top_cat=87ShellLooks like nice metal. The copper clad pcbs really tarnish quickly. Guess I've always known that, just forgot.Its great therapy working on this project. today so much is plug and play, its taken a lot of fun out of electronics. Remember heathkit? Can u imagine someone building a radio from a kit nowadays? Lost art I think.Another thing is surface mount components and ICs rather than discrete components... not as easy to work with...however, this project is scratch built and haven't had to use tweezers and a magnifying glass once!
Quote from: rfmwguy on 08/04/2015 09:50 pmQuote from: deltaMass on 08/04/2015 08:55 pmQuote from: rfmwguy on 08/04/2015 06:32 pmQuote from: X_RaY on 08/04/2015 06:26 pmQuote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />Ha! Let me guess - it's the reason you bought the house https://www.onlinemetals.com/merchant.cfm?pid=15244&step=4&showunits=inches&id=966&top_cat=87Shell
Quote from: deltaMass on 08/04/2015 08:55 pmQuote from: rfmwguy on 08/04/2015 06:32 pmQuote from: X_RaY on 08/04/2015 06:26 pmQuote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />Ha! Let me guess - it's the reason you bought the house
Just want to make sure I am reading Tajmar's paper correctly here. His testing in hard vacuum only used the magnetic damper and did not feature the oil damper. Right? For curiosity's sake, is it even possible to use an oil damper in vacuum? Would the oil boil off and coat everything? What would be a suitable fluid?
I made significant changes to the Yang-Shell model for this run. That is, I changed the axis of rotation to correspond to the "z" coordinate axis. (It had previously been "x.") This was for consistency with conventional physics notation where z is the longitudinal axis of a waveguide, so the EM field components Ez and Hz are in the longitudinal direction. This is important because as I read on meep-discuss (Steven G.) TE = Ex Ey Hz. With my previous x longitudinal coordinate, the conventional Hz direction would have been Hx and so there was a liklyhood that the EM field components were being confused. In any case, I changed coordinates, excited the cavity with a TE source (Ex EY Hz) using 3 co-located and oriented antennas, and am still in the process of evaluating, but this data set (the first) is quite interesting to look at. You can help with this - What should the placement and direction of the 3 antennas really be? Trying to excite totally different field components, I think they should certainly be oriented in different directions and likely located in different places.I uploaded the data here:https://drive.google.com/folderview?id=0B1XizxEfB23tfktkSTVyMDhrWW83ektlcjdJS1lxa1RJMG5zUmxjaHVId0NFZmVrdElLX2s&usp=sharingNote that the end fields (z-views) appear to rotate clockwise one revolution per cycle. By comparing these views with the views uploaded yesterday,https://drive.google.com/folderview?id=0B1XizxEfB23tflFzUEREeWtJMVZucl9nOWtGaGUtUzlkdnczSkthYVVNVDU4UGNMZ29iRm8&usp=sharingYou can see that the change in coordinate systems made a difference. (same 3 antennas/sources, same cavity, different coordinate convention.)
Quote from: SeeShells on 08/04/2015 11:13 pmQuote from: rfmwguy on 08/04/2015 09:50 pmQuote from: deltaMass on 08/04/2015 08:55 pmQuote from: rfmwguy on 08/04/2015 06:32 pmQuote from: X_RaY on 08/04/2015 06:26 pmQuote from: ElizabethGreene on 08/04/2015 05:10 pm<lurk />Ha! Let me guess - it's the reason you bought the house Just lucky...I had sworn off electronics several years ago, built computers, ham repeaters, direction finding equipment, hifi speakers, amps, etc...kinda missed the smell of a hot soldering iron Me too. I always had a workshop and in the last few years all those toys have gathered dust. I didn't know until I started this project how much I missed it. I should have never hung up that soldering iron.Got this beautiful sheet of copper in from https://www.onlinemetals.com/merchant.cfm?pid=15244&step=4&showunits=inches&id=966&top_cat=87 Took me a 1/2 hour to unbox it. @ .032 thick it will make a great frustum.ShellLooks like nice metal. The copper clad pcbs really tarnish quickly. Guess I've always known that, just forgot.Its great therapy working on this project. today so much is plug and play, its taken a lot of fun out of electronics. Remember heathkit? Can u imagine someone building a radio from a kit nowadays? Lost art I think.Another thing is surface mount components and ICs rather than discrete components... not as easy to work with...however, this project is scratch built and haven't had to use tweezers and a magnifying glass once!
Quote from: aero on 08/05/2015 01:05 amI made significant changes to the Yang-Shell model for this run. That is, I changed the axis of rotation to correspond to the "z" coordinate axis. (It had previously been "x.") This was for consistency with conventional physics notation where z is the longitudinal axis of a waveguide, so the EM field components Ez and Hz are in the longitudinal direction. This is important because as I read on meep-discuss (Steven G.) TE = Ex Ey Hz. With my previous x longitudinal coordinate, the conventional Hz direction would have been Hx and so there was a liklyhood that the EM field components were being confused. In any case, I changed coordinates, excited the cavity with a TE source (Ex EY Hz) using 3 co-located and oriented antennas, and am still in the process of evaluating, but this data set (the first) is quite interesting to look at. You can help with this - What should the placement and direction of the 3 antennas really be? Trying to excite totally different field components, I think they should certainly be oriented in different directions and likely located in different places.I uploaded the data here:https://drive.google.com/folderview?id=0B1XizxEfB23tfktkSTVyMDhrWW83ektlcjdJS1lxa1RJMG5zUmxjaHVId0NFZmVrdElLX2s&usp=sharingNote that the end fields (z-views) appear to rotate clockwise one revolution per cycle. By comparing these views with the views uploaded yesterday,https://drive.google.com/folderview?id=0B1XizxEfB23tflFzUEREeWtJMVZucl9nOWtGaGUtUzlkdnczSkthYVVNVDU4UGNMZ29iRm8&usp=sharingYou can see that the change in coordinate systems made a difference. (same 3 antennas/sources, same cavity, different coordinate convention.)You got my attention with z axis rotation. Are Ds and Db rotations in sync or is Ds faster?
Quote from: A_M_Swallow on 08/04/2015 06:22 pmQuote from: WarpTech on 08/02/2015 01:09 am... 100MHz is a nice frequency range to deal with but it is bang in the middle of the UK's civilian FM radio range (87.5 - 108MHz). Anyone using a leaky Faraday cage with a kW magnetron in that frequency range will probably receive legally enforceable complaints about interference.Does around 100MHz mean the resonate frequency of the frustum in the EM Drive can be designed to be say 110MHz or 120MHz or 200MHz or 75MHz?It is currently early August 2015, so the FCC, Ofcom (UK) and overseas regulators can still give 'suggestions' for a suitable frequency range before new thrust frustums are made. They will have to allow for air at 1 atmosphere, low pressure nitrogen and the vacuum of space when choosing a range.Anyone can ask a regulator for advice but to be taken seriously a formal request to reserve a frequency range for spacecraft thrusters probably has to come from an authority such as NASA. If the government delays too long all the EM Drives will say "Made in China" and use a frequency chosen by the Chinese Government.All EM-Drive experiments that use more than 20 Watts CW and that are not done inside a shielded room violate FCC laws in the US. It doesn't matter what the frequency is; although some frequencies may be under the management of the NTIA instead of the FCC. All it takes is for someone to detect the high power interference from an EM-Drive experiment, locate the source by triangulation, and then report their observations to the FCC. Enforcement can result in hefty fines. Other countries have similar spectrum management laws. Experimenters tend to believe the microwave oven frequencies are free for them to use because all ovens leak some radiation anyway. The problem is once you remove a magnetron from an oven that is a non-conforming use; something the FCC, if there is an enforcement action, will take a dim view of. The wide range of emissions interferes with Part 15 devices and scientific work including SETI, radio astronomy, and NASA deep space satellites.{snip}
Quote from: WarpTech on 08/02/2015 01:09 am... 100MHz is a nice frequency range to deal with but it is bang in the middle of the UK's civilian FM radio range (87.5 - 108MHz). Anyone using a leaky Faraday cage with a kW magnetron in that frequency range will probably receive legally enforceable complaints about interference.Does around 100MHz mean the resonate frequency of the frustum in the EM Drive can be designed to be say 110MHz or 120MHz or 200MHz or 75MHz?It is currently early August 2015, so the FCC, Ofcom (UK) and overseas regulators can still give 'suggestions' for a suitable frequency range before new thrust frustums are made. They will have to allow for air at 1 atmosphere, low pressure nitrogen and the vacuum of space when choosing a range.Anyone can ask a regulator for advice but to be taken seriously a formal request to reserve a frequency range for spacecraft thrusters probably has to come from an authority such as NASA. If the government delays too long all the EM Drives will say "Made in China" and use a frequency chosen by the Chinese Government.
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Quote from: rfmwguy on 08/05/2015 01:26 amQuote from: aero on 08/05/2015 01:05 amI made significant changes to the Yang-Shell model for this run. That is, I changed the axis of rotation to correspond to the "z" coordinate axis. (It had previously been "x.") This was for consistency with conventional physics notation where z is the longitudinal axis of a waveguide, so the EM field components Ez and Hz are in the longitudinal direction. This is important because as I read on meep-discuss (Steven G.) TE = Ex Ey Hz. With my previous x longitudinal coordinate, the conventional Hz direction would have been Hx and so there was a liklyhood that the EM field components were being confused. In any case, I changed coordinates, excited the cavity with a TE source (Ex EY Hz) using 3 co-located and oriented antennas, and am still in the process of evaluating, but this data set (the first) is quite interesting to look at. You can help with this - What should the placement and direction of the 3 antennas really be? Trying to excite totally different field components, I think they should certainly be oriented in different directions and likely located in different places.I uploaded the data here:https://drive.google.com/folderview?id=0B1XizxEfB23tfktkSTVyMDhrWW83ektlcjdJS1lxa1RJMG5zUmxjaHVId0NFZmVrdElLX2s&usp=sharingNote that the end fields (z-views) appear to rotate clockwise one revolution per cycle. By comparing these views with the views uploaded yesterday,https://drive.google.com/folderview?id=0B1XizxEfB23tflFzUEREeWtJMVZucl9nOWtGaGUtUzlkdnczSkthYVVNVDU4UGNMZ29iRm8&usp=sharingYou can see that the change in coordinate systems made a difference. (same 3 antennas/sources, same cavity, different coordinate convention.)You got my attention with z axis rotation. Are Ds and Db rotations in sync or is Ds faster?I didn't check, need a movie. I'm thinking along the lines of Orbital Angular Momentum, attached.
Quote from: aero on 08/05/2015 01:28 amQuote from: rfmwguy on 08/05/2015 01:26 amQuote from: aero on 08/05/2015 01:05 amI made significant changes to the Yang-Shell model for this run. That is, I changed the axis of rotation to correspond to the "z" coordinate axis. (It had previously been "x.") This was for consistency with conventional physics notation where z is the longitudinal axis of a waveguide, so the EM field components Ez and Hz are in the longitudinal direction. This is important because as I read on meep-discuss (Steven G.) TE = Ex Ey Hz. With my previous x longitudinal coordinate, the conventional Hz direction would have been Hx and so there was a liklyhood that the EM field components were being confused. In any case, I changed coordinates, excited the cavity with a TE source (Ex EY Hz) using 3 co-located and oriented antennas, and am still in the process of evaluating, but this data set (the first) is quite interesting to look at. You can help with this - What should the placement and direction of the 3 antennas really be? Trying to excite totally different field components, I think they should certainly be oriented in different directions and likely located in different places.I uploaded the data here:https://drive.google.com/folderview?id=0B1XizxEfB23tfktkSTVyMDhrWW83ektlcjdJS1lxa1RJMG5zUmxjaHVId0NFZmVrdElLX2s&usp=sharingNote that the end fields (z-views) appear to rotate clockwise one revolution per cycle. By comparing these views with the views uploaded yesterday,https://drive.google.com/folderview?id=0B1XizxEfB23tflFzUEREeWtJMVZucl9nOWtGaGUtUzlkdnczSkthYVVNVDU4UGNMZ29iRm8&usp=sharingYou can see that the change in coordinate systems made a difference. (same 3 antennas/sources, same cavity, different coordinate convention.)You got my attention with z axis rotation. Are Ds and Db rotations in sync or is Ds faster?I didn't check, need a movie. I'm thinking along the lines of Orbital Angular Momentum, attached.I believe the frustum may compress and accelerate rotation at Ds compared to Db.
A theory to the EM Drive ThrustWhen you shine light or thrust from any of the electromagnetic wavelength the object you are hitting will move in the opposite direction and the force applied will bounce off. But when two wavelenghts of different amplitude collide they cancel each other outThe reason the Em Drive has a net thrust in one direction is because when the electromagnetic wave reaches the wide end there is a greater likelihood of the waves being canceled out, equating in a net thrust at the smaller end.It would be simpler to just have a copper plate and bounce the wavelenghts off this.