Quote from: Rodal on 07/30/2015 01:00 amQuote from: SeeShells on 07/30/2015 12:51 amDr. Rodal,Are these from the antenna positions with the monopole in the side towards the bottom exciting the TE mode I sent you and aero?ShellNo. These are the steady-state fields computed from the exact solution for the Yang/Shell cavity due purely to standing waves, assuming that (by whatever means) a pure TE012 mode has been excitedThe purpose of showing these images, as per the sketch of X-Ray is : once you know what TE012 is supposed to look like for Yang/Shell, then optimize the location of the antenna to excite such a mode._________PS: I did not receive antenna positions with a monopole, rather I understand that you sent that information to aero through a private e-mail (that's what I understand from your Personal Message). I sent pictures and a very basic calculation so it could be understood, PM here doesn't allow pics. Have aero send you or me if you want.
Quote from: SeeShells on 07/30/2015 12:51 amDr. Rodal,Are these from the antenna positions with the monopole in the side towards the bottom exciting the TE mode I sent you and aero?ShellNo. These are the steady-state fields computed from the exact solution for the Yang/Shell cavity due purely to standing waves, assuming that (by whatever means) a pure TE012 mode has been excitedThe purpose of showing these images, as per the sketch of X-Ray is : once you know what TE012 is supposed to look like for Yang/Shell, then optimize the location of the antenna to excite such a mode._________PS: I did not receive antenna positions with a monopole, rather I understand that you sent that information to aero through a private e-mail (that's what I understand from your Personal Message).
Dr. Rodal,Are these from the antenna positions with the monopole in the side towards the bottom exciting the TE mode I sent you and aero?Shell
Dr. Rodal,Are these from the antenna positions with the monopole in the side towards the bottom exciting the TE mode I sent you and aero?ShellEdit: I'd like to see a square loop (sounds weird) antenna if it could be modeled. What happened to our meep crew? They rocked and poofed.This was a monopole antenna not a dipole set into the sidewall, a dipole wouldn't do TE modes. Just used the sidewall of the cavity as a ground plane.
Quote from: SeeShells on 07/30/2015 12:51 amDr. Rodal,Are these from the antenna positions with the monopole in the side towards the bottom exciting the TE mode I sent you and aero?ShellEdit: I'd like to see a square loop (sounds weird) antenna if it could be modeled. What happened to our meep crew? They rocked and poofed.This was a monopole antenna not a dipole set into the sidewall, a dipole wouldn't do TE modes. Just used the sidewall of the cavity as a ground plane.This meepster is till here. Busy at work & getting stuff ready for school to start - about all I have time for is catching up reading on this thread. Square antenna may be just as simple as defining x & y sizes. Might get some time tomorrow to try.
Ha. Probably at your age I was getting 2-3 hours a sleep a night and doing calculus with my slide rule in one hand and divide by 0 in the other. Good to hear from you and school is the most important thing right now. get er done.
DIYer thought - can't use this on my copper mesh, but enclosed frustums can..thermochromatic paint (google away). Doc and others are studying e&m mode modeling in meep and they are related to thermal signatures. This paint will change color over a prescribed temp range. I'd suggest abt 40 to 125°C sensitivity for painting Exterior (only) surfaces of the frustum. Side benefit is coating to inhibit oxidation.
Quote from: rfmwguy on 07/30/2015 02:36 amDIYer thought - can't use this on my copper mesh, but enclosed frustums can..thermochromatic paint (google away). Doc and others are studying e&m mode modeling in meep and they are related to thermal signatures. This paint will change color over a prescribed temp range. I'd suggest abt 40 to 125°C sensitivity for painting Exterior (only) surfaces of the frustum. Side benefit is coating to inhibit oxidation.I've used pressure tapes and thermal tapes like the pressure but this in a interesting idea.
"Our aim at the moment is not to necessarily go for these space applications, because they will take so long to come to fruition. So what we've decided as a company is to forget space, and to go for terrestrial transport business, which is huge," Shawyer told IBTimes UK."The logic is, if you can lift a vehicle reasonably gently with no large accelerations, then you can manufacture the air frame using much lower technology than would be used on an aircraft."Terrafugia's TF-X flying car concept, due to launch in 2021, could benefit from the use of the EmDrive space propulsion technology, according to Roger Shawyer.Shawyer says his firm, Satellite Propulsion Research Ltd, is currently designing a drone that has no propellers or wings, and it plans to carry out the first test flights powered by EmDrive microwave space propulsion in 2017.
JULY 23, 2015Cannae has moved into a new headquarters and laboratory. We are installing our vacuum chamber and superconducting test laboratory which will be operational in August 2015. We will be testing next-generation prototypes of the Cannae Drive technology in September 2015. Stay tuned!
Here is an example from meep-discuss that uses a square loop antenna. The example problem doesn't work but I think that was a different problem with his control file. Using ( 2 pi ) * something instead of ( 0 + 2 pi i ) * something. He should have been using a complex multiplier, that is, if I'm recalling the right / problem answer.This is the same example that I uploaded yesterday morning, but that is 10 pages up thread, so here it is again.
http://www.ibtimes.co.uk/emdrive-roger-shawyer-paper-describing-space-propulsion-uavs-finally-passes-peer-review-1513223Quote"Our aim at the moment is not to necessarily go for these space applications, because they will take so long to come to fruition. So what we've decided as a company is to forget space, and to go for terrestrial transport business, which is huge," Shawyer told IBTimes UK."The logic is, if you can lift a vehicle reasonably gently with no large accelerations, then you can manufacture the air frame using much lower technology than would be used on an aircraft."Terrafugia's TF-X flying car concept, due to launch in 2021, could benefit from the use of the EmDrive space propulsion technology, according to Roger Shawyer.Shawyer says his firm, Satellite Propulsion Research Ltd, is currently designing a drone that has no propellers or wings, and it plans to carry out the first test flights powered by EmDrive microwave space propulsion in 2017.
Quote from: TheTraveller on 07/30/2015 04:12 amhttp://www.ibtimes.co.uk/emdrive-roger-shawyer-paper-describing-space-propulsion-uavs-finally-passes-peer-review-1513223Quote"Our aim at the moment is not to necessarily go for these space applications, because they will take so long to come to fruition. So what we've decided as a company is to forget space, and to go for terrestrial transport business, which is huge," Shawyer told IBTimes UK."The logic is, if you can lift a vehicle reasonably gently with no large accelerations, then you can manufacture the air frame using much lower technology than would be used on an aircraft."Terrafugia's TF-X flying car concept, due to launch in 2021, could benefit from the use of the EmDrive space propulsion technology, according to Roger Shawyer.Shawyer says his firm, Satellite Propulsion Research Ltd, is currently designing a drone that has no propellers or wings, and it plans to carry out the first test flights powered by EmDrive microwave space propulsion in 2017.Eh? They plan to float stuff? How many newtons are needed for 1g acceleration of a 15kg drone?
Seems like a lot more than they can generate right now, in a 10 kg device.Am i reading something wrong in that news piece or do they really think they can FLOAT something against gravity? Seems counter intuitive when they claim to not be interested in space anymore and at the same time dry they can generate 1g of acceleration...
QuoteSeems like a lot more than they can generate right now, in a 10 kg device.Am i reading something wrong in that news piece or do they really think they can FLOAT something against gravity? Seems counter intuitive when they claim to not be interested in space anymore and at the same time dry they can generate 1g of acceleration...External (beamed) power source, perhaps? Thought I saw a thread on something like that around here....
Quote from: Star One on 07/29/2015 11:04 pmQuote from: deltaMass on 07/29/2015 08:54 pmQuote from: Flyby on 07/29/2015 08:17 pmSo many people talk about the violation of CoM and CoE with the EMdrive. But is that really the case? Maybe it does not brake CoM, as some populists let us to believe , but we simply have not yet figured it out how CoM is conserved all together?It must be floobie-dust flying off in the opposite direction Maybe trying giving a sensible answer to a legitimate question.Maybe try[sic] getting a sense of humour
Quote from: deltaMass on 07/29/2015 08:54 pmQuote from: Flyby on 07/29/2015 08:17 pmSo many people talk about the violation of CoM and CoE with the EMdrive. But is that really the case? Maybe it does not brake CoM, as some populists let us to believe , but we simply have not yet figured it out how CoM is conserved all together?It must be floobie-dust flying off in the opposite direction Maybe trying giving a sensible answer to a legitimate question.
Quote from: Flyby on 07/29/2015 08:17 pmSo many people talk about the violation of CoM and CoE with the EMdrive. But is that really the case? Maybe it does not brake CoM, as some populists let us to believe , but we simply have not yet figured it out how CoM is conserved all together?It must be floobie-dust flying off in the opposite direction
So many people talk about the violation of CoM and CoE with the EMdrive. But is that really the case? Maybe it does not brake CoM, as some populists let us to believe , but we simply have not yet figured it out how CoM is conserved all together?