(...)ps.It is strange he almost never looks straight to the interviewer or the camera...feels more like a internal monologue then a communication to persuade others...Needs some media training, for sure..
He's a diffident Englishman, an engineer. That's how we speak. We are not trying to sell you toothpaste with lashings of false sincerity and dazzling false smiles. It's a cultural thing.
Quote from: zaphod_vi on 05/24/2015 02:50 amQuote from: kdhilliard on 05/24/2015 01:55 amI'm pretty sure he is not saying that he has actually felt the thrust with his hand from any of his exiting drives, but instead that were you to build a model with higher thrust you could feel itFrom the video you could take it either way. Either he has, or you would, feel a force. What is odd though is how do you get from a reaction-less drive that operates by bouncing microwaves around in a cavity, to something that behaves more like a traditional rocket. How do you make that leap. Perhaps Shawyer found the rocket like behaviour when he built his prototype, has mashed the two together because he is not quite sure what is going on, and has been hand-waving ever since.Point of terminology - As Shawyer points out, this is not a reactionless drive, rather a propellant less drive.Paraphrasing Newton's third law, Action = Reaction. Let's don't break that law along with all the others. If reaction = zero, then Action = zero and zero doesn't show on most force measuring devices that I know of.
Quote from: kdhilliard on 05/24/2015 01:55 amI'm pretty sure he is not saying that he has actually felt the thrust with his hand from any of his exiting drives, but instead that were you to build a model with higher thrust you could feel itFrom the video you could take it either way. Either he has, or you would, feel a force. What is odd though is how do you get from a reaction-less drive that operates by bouncing microwaves around in a cavity, to something that behaves more like a traditional rocket. How do you make that leap. Perhaps Shawyer found the rocket like behaviour when he built his prototype, has mashed the two together because he is not quite sure what is going on, and has been hand-waving ever since.
I'm pretty sure he is not saying that he has actually felt the thrust with his hand from any of his exiting drives, but instead that were you to build a model with higher thrust you could feel it
Quote from: deltaMass on 05/24/2015 02:53 amTossing Poynting vectors around begs the question of how sustained thrust at a level approximately Q times that of an equally-powered photon rocket could possibly obtain.You only have to prove it instantaneously. Then it will hold in the frame of reference of the cavity due to GR. Inertial frames won't do it, they aren't accelerating.
Tossing Poynting vectors around begs the question of how sustained thrust at a level approximately Q times that of an equally-powered photon rocket could possibly obtain.
Note: Shawyer's analogy to a rocket is non-viable because a rocket has variable mass , it is the propellant exiting the rocket (like a bullet exiting a gun results in the gun's recoil force), the variable mass of the rocket, that is responsible for a rocket's acceleration. The EM Drive is a closed cavity and is described by Shawyer as propellant-less with nothing exiting the EM Drive.
[...]The cutoff and guide wavelengths are different for TE and TM modes and what m,n values you use. This affects Df.I adopted my spreadsheet to handle both TE01 and TM01 modes so a 1 cell binary change flips between them.Length is then determined by numerically intergating 1,000 diameter changes between the end plates and working out the averaged guide wavelength to give 1/2 wave resonance. Then the driving Rf can be a harmonic of the averaged guide wavelength. Length is then adjusted so the external Rf harmonic is the same as the selected Rf wavelength.
Spacetime is the one force that can pretty much violate it all and if you remember it's the one thing they measured with the laser through the cavity that seemed to change. By invoking a field of electromagnetic harmonics (TM212 or one like it) that creates a bubble, a null, a void, a hollowed out area within the EM cavity do we start to see a manipulation of space time and space time can violate CoE and CoM like it did in the beginning with the great expansion.
Quote from: SeeShells on 05/24/2015 02:20 pmSpacetime is the one force that can pretty much violate it all and if you remember it's the one thing they measured with the laser through the cavity that seemed to change. By invoking a field of electromagnetic harmonics (TM212 or one like it) that creates a bubble, a null, a void, a hollowed out area within the EM cavity do we start to see a manipulation of space time and space time can violate CoE and CoM like it did in the beginning with the great expansion. Until proven otherwise I'll point to Lisa Randall's gravity brane and the hypothetical 4th spacial dimension. Inflate that dimension using RF energy and the strength of gravity is diminished. The Universe itself inflated 3 spatial dimensions in the inflationary period, so there is a mechanism. Upcoming experiments at CERN this summer are looking to confirm/disprove predictions from her theory. As I understand these are the first predictions to come from string theory that are testable.
Quote from: TheTraveller on 05/24/2015 05:51 am[...]The cutoff and guide wavelengths are different for TE and TM modes and what m,n values you use. This affects Df.I adopted my spreadsheet to handle both TE01 and TM01 modes so a 1 cell binary change flips between them.Length is then determined by numerically intergating 1,000 diameter changes between the end plates and working out the averaged guide wavelength to give 1/2 wave resonance. Then the driving Rf can be a harmonic of the averaged guide wavelength. Length is then adjusted so the external Rf harmonic is the same as the selected Rf wavelength.Is there any particular combination of length, radii and frequency, that would make the energy difference between the TM01 and TM11, or other mode very large? If there is a way to maximize this gap in energy, it will maximize the energy stored in TM01, I think...