I have no idea what that represents. Please explain and elaborate for those of us on a different wavelength
Quote from: Rodal on 08/01/2015 11:27 pmI have no idea what that represents. Please explain and elaborate for those of us on a different wavelengthWhen the topic drifted towards increasing or decreasing cone-angles to maximize the difference in areas between small and large bases, my thoughts drifted to the Shawyer type geometries with hemispherical ends:Which, when grown to maximize the difference between the small end and large end, leads me to a large base that approximates a sphere with a truncated cone subtracted from it:I'm not going to be surprised if I'm simply not groking something fundamental that makes this train of thought a bit hair-brained.
I don't see right away how to closed-form analyze that geometry (or to imagine what it looks like in 3D)but thanks for bringing out of the box thinking in the best tradition of American ingenuity
QuoteI don't see right away how to closed-form analyze that geometry (or to imagine what it looks like in 3D)but thanks for bringing out of the box thinking in the best tradition of American ingenuity If I understand it correctly, the 3D solid would be a sphere with a void in the format of a cone with rounded tip, which ends at the center of the sphere.@RotoSequence correct me if I'm wrong.
Quote from: leomillert on 08/02/2015 12:19 amQuoteI don't see right away how to closed-form analyze that geometry (or to imagine what it looks like in 3D)but thanks for bringing out of the box thinking in the best tradition of American ingenuity If I understand it correctly, the 3D solid would be a sphere with a void in the format of a cone with rounded tip, which ends at the center of the sphere.@RotoSequence correct me if I'm wrong.I think you're quite right. Take that 2D and round it out pull the plug out of it like a frustum and bingo. I see it too so if it's wrong there are two crazies on here...
This should make what I'm saying a little clearer. Using @Notsosureofit's theory. From this, we can see how the design of the frustum could be maximized for thrust. What puzzles me is why we are working in microwaves when the equation clearly shows that lower frequency is better. Todd
Quote from: leomillert on 08/02/2015 12:39 amIf I understand correctly, because cut-off doesn't apply to tapered cavities, the small bases' diameter can be as small as desired.If we take RotoSequence's idea of the solid with Rodal's adjustment, that would mean an sphere with as little void as possible (in the form of a cone of pointy tip).Does this sound plausible?No problem with that. A radar geometry are two cones on the same axis of axisymmetry with their pointy cones touching each other, one cone pointing up and the other cone pointing down. Spherical waves emanate from the common tip.This would be just the asymmetrical form with just one pointy cone and spherical waves coming out from the tip.
If I understand correctly, because cut-off doesn't apply to tapered cavities, the small bases' diameter can be as small as desired.If we take RotoSequence's idea of the solid with Rodal's adjustment, that would mean an sphere with as little void as possible (in the form of a cone of pointy tip).Does this sound plausible?
Quote from: leomillert on 08/02/2015 12:39 amIf I understand correctly, because cut-off doesn't apply to tapered cavities, the small bases' diameter can be as small as desired.If we take RotoSequence's idea of the solid with Rodal's adjustment, that would mean an sphere with as little void as possible (in the form of a cone of pointy tip).Does this sound plausible?Not to me. He started this thinking it was taking what I said to the extreme, but I think he went beyond that. I don't even recognize it anymore. :-/ Incremental changes guys! Let's not stray too far from what we're focusing on.Todd
The Yang/Shell dimensions with cone half angle at 6 degrees had TM113 and TE012 both resonate at near 2.45 GHz.This geometry (now officially entered into the World Book Of Paranormal EM Drive Phenomena) resonates with TE012 at 2.45 GHz but the TM11 modes are further apart:TM112= 2.23227 GHzTM113= 2.64095 GHz So aero will have to model it in Meep with a loop antenna or we have no resonance at 2.45 GHz
Quote from: WarpTech on 08/01/2015 11:51 pmThis should make what I'm saying a little clearer. Using @Notsosureofit's theory. From this, we can see how the design of the frustum could be maximized for thrust. What puzzles me is why we are working in microwaves when the equation clearly shows that lower frequency is better. ToddChange one thing at a time. This started with (a) microwaves, (b) microwave ovens as a cheap source and (c) no underlying theory.
Quote from: Rodal on 08/02/2015 12:31 amThe Yang/Shell dimensions with cone half angle at 6 degrees had TM113 and TE012 both resonate at near 2.45 GHz.This geometry (now officially entered into the World Book Of Paranormal EM Drive Phenomena) resonates with TE012 at 2.45 GHz but the TM11 modes are further apart:TM112= 2.23227 GHzTM113= 2.64095 GHz So aero will have to model it in Meep with a loop antenna or we have no resonance at 2.45 GHzGo ahead make me feel bad Jose', I'm about ready to take a brick to the first frustum I'm so frustrumed.
Quote from: SeeShells on 08/02/2015 01:07 amQuote from: Rodal on 08/02/2015 12:31 amThe Yang/Shell dimensions with cone half angle at 6 degrees had TM113 and TE012 both resonate at near 2.45 GHz.This geometry (now officially entered into the World Book Of Paranormal EM Drive Phenomena) resonates with TE012 at 2.45 GHz but the TM11 modes are further apart:TM112= 2.23227 GHzTM113= 2.64095 GHz So aero will have to model it in Meep with a loop antenna or we have no resonance at 2.45 GHzGo ahead make me feel bad Jose', I'm about ready to take a brick to the first frustum I'm so frustrumed. Just as long as you don't throw the brick at me
I for one welcome our insectoid overlords