"Resonant" is a bit odd. On the one hand, all cavities are resonant in principle. On the other hand, some people may feel that running off resonance has advantages of some sort.Unfortunately, "Cavity Drive" makes one think of an urgent trip to the dentist.
Quote from: mwvp on 07/22/2015 10:08 amSomething very interesting and important occurs as the cutoff is closely approached. The group velocity decrease exponentially.Cut-off is a concept that ... does not apply to tapered waveguides, as it has been remarked and shown in several peer-reviewed papers I have pointed out in the paper I wrote about cut-off frequencies of the truncated cone used for the EM Drive (which I attach below)....One can safely reduce the small diameters of the EM Drives used by Shawyer, NASA and Yang to only 20% of its tested value without reaching cut-off per se. Now, whether it is better or worse to have such a longer cone remains to be explored
Something very interesting and important occurs as the cutoff is closely approached. The group velocity decrease exponentially.
Propellantless Electromagnetic Drive ?Seems to satisfy all the above constraints...
Quote from: Rodal on 07/22/2015 01:57 pmQuote from: mwvp on 07/22/2015 10:08 amSomething very interesting and important occurs as the cutoff is closely approached. The group velocity decrease exponentially.Cut-off is a concept that ... does not apply to tapered waveguides, as it has been remarked and shown in several peer-reviewed papers I have pointed out in the paper I wrote about cut-off frequencies of the truncated cone used for the EM Drive (which I attach below)....One can safely reduce the small diameters of the EM Drives used by Shawyer, NASA and Yang to only 20% of its tested value without reaching cut-off per se. Now, whether it is better or worse to have such a longer cone remains to be exploredThank you very much. Looks like its got some very useful stuff. I just glanced through it, I'll look at it in detail later. What I'd like to see, in some other similar papers also, is the effect on Q as the cavity length is extended and dia. reduced beyond the arbitrary, non-applicable "cutoff"....
"Resonant" is a bit odd. On the one hand, all cavities are resonant in principle, rendering the name tautologous.
Unfortunately, "Cavity Drive" makes one think of an urgent trip to the dentist.
Otherwise "dispersive" should qualify cavity.
Electromagnetic Drive or Reactor seems safe, perhaps a little better than Thruster since we're not 100% sure its pushing rather than pulling.
Quote from: Rodal on 07/22/2015 01:57 pmQuote from: mwvp on 07/22/2015 10:08 amSomething very interesting and important occurs as the cutoff is closely approached. The group velocity decrease exponentially.Cut-off is a concept that ... does not apply to tapered waveguides, as it has been remarked and shown in several peer-reviewed papers I have pointed out in the paper I wrote about cut-off frequencies of the truncated cone used for the EM Drive (which I attach below).Something else to consider, along the lines of dielectric/waveguide-defect ghost modes:Attenuation in Rectangular Waveguides with Finite Conductivity WallsKim Ho YEAP1, Choy Yoong THAM 2, Ghassan YASSIN 3, Kee Choon YEONG4ment with the PPM and experimental results for the case ofthe dominant TE10 mode. An important consequence of thiswork is the demonstration that the loss computed for de-generate modes propagating simultaneously is not simplyadditive. In other words, the combined loss of two co-ex-isting modes is higher than adding the losses of two modespropagating independently. This can be explained by themode coupling effects, which is significant when the phaseconstants of two propagating modes are different yet veryclose."
Quote from: mwvp on 07/22/2015 10:08 amSomething very interesting and important occurs as the cutoff is closely approached. The group velocity decrease exponentially.Cut-off is a concept that ... does not apply to tapered waveguides, as it has been remarked and shown in several peer-reviewed papers I have pointed out in the paper I wrote about cut-off frequencies of the truncated cone used for the EM Drive (which I attach below).
ACDAsymmetric Cavity Drive