1. Copper at each end2. Copper at the large end and silver at the small end3. Silver at the small end and copper at the large end4. Silver at each end
Suspect too many physicists and mathematicians have dug too deep a hole for themselves to ever admit they were mistaken about Shawyer.When I get my rotary test rig up and spinning, will watch how many have the guts to admit they were wrong.
Quote from: RERT on 07/26/2015 02:55 pm1. Copper at each end2. Copper at the large end and silver at the small end3. Silver at the small end and copper at the large end4. Silver at each endMay I add:5. Metglas at the large endAccording to Fran De Acquino, Professor Emeritus of Physics, Maranhão State University (UEMA) and Titular Researcher, National Institute for Space Research (INPE):Fran De Aquino (2014). How the Thrust of Shawyer’s Thruster can be Strongly Increased <hal-01074608>Metglas® 2714A is an amorphous metal alloy with a ultrahigh relative magnetic permeability µr = 1,000,000 which should strongly increase EmDrive thrust if plated on the large end. This was discussed previously in this thread.Metglas® 2714A Magnetic Alloy spec sheet
....She taught me that brilliance and the number of degrees you had or not was only one small part of the equation to discover truths, she taught me that passion and inquisitiveness and being encouraging and instilling that passion into others was the full equation to be successful.I don't have the degrees some have here, I don't have the brilliance but I have the gift she gave me and that is the gift of passion and to encourage and cheer on a idea or thought and push to do it together. This is the other half of finding the truth. I thank her for that.....
Interesting that Tajmar's EMDrive had the ability to vary the cavity length, to get resonance. As did the Shawyer Experimental and Demonstrator EMDrives.
I know this is not quite related to space flight or new propulsive ideas but it's something deeper and rests in the foundations of what and who we all are, it is the passion to learn and strive to learn and question and be better than we can ever believe we could be. It is as important as any formula posted.I lost my mother last night and it's a very heavy hearted day. There is a plus side also, on reflecting on all of those who are here and even those who are just visiting. I know there was/is someone in your life who pushed you to learn and cheered you to take that next step. Whether it was your mother or father or someone you admired. It was my mother who instilled in me the faith that I could follow my dreams, solve the questions I had. She didn't even scold me when I took apart our only wind up alarm clock at 4, but instead helped me put it back together again.She taught me that brilliance and the number of degrees you had or not was only one small part of the equation to discover truths, she taught me that passion and inquisitiveness and being encouraging and instilling that passion into others was the full equation to be successful.I don't have the degrees some have here, I don't have the brilliance but I have the gift she gave me and that is the gift of passion and to encourage and cheer on a idea or thought and push to do it together. This is the other half of finding the truth. I thank her for that.I will continue to cheer others on and be kind and thoughtful and look at their thought and ideas as they were the most important thing in the world, for those equations and formulas are derived from knowledge but are driven by passion. I'm sorry this isn't about a scientific thought or a new wizzbang formula but in truth it is the other side of what makes this work and that's the passion of the Woo Hoo moment we're all after.Shell
Quote from: TheTraveller on 07/26/2015 07:34 amInteresting that Tajmar's EMDrive had the ability to vary the cavity length, to get resonance. As did the Shawyer Experimental and Demonstrator EMDrives.This post shows an image ot Tajmar's cavity and wave guide. I have modelled the bare cavity in meep, in perfect metal and driven by an antenna. I could not detect resonance at 2.44 GHz but an image of the cavity field patterns (or lack of patterns) is attached. The antenna was to long for the cavity, but the correct length for the frequency.I did detect huge (meep's trick with Q) resonance above 4 GHz, and have attached an image.I also generated images at 4.376 GHz with lateral antenna configured 1/4 wavelength from the small end and at 4.717 GHz with axial antenna 1/4 wavelength from the small end. In both cases the antenna length was correct based on the frequency. However the small size of the cavity resulted in 1/4 wavelength from the small end being less than 1/4 wavelength from the big end. The cavity is less than 1/2 wavelength long? It seems that the next logical step would be to model the wave guide and the cavity together as any resonance at 2.44 GHz must include the field energies within the big wave guide and the cavity. That might also explain the unexpected lateral force measured.
Quote from: TheTraveller on 07/26/2015 09:00 amSuspect too many physicists and mathematicians have dug too deep a hole for themselves to ever admit they were mistaken about Shawyer.When I get my rotary test rig up and spinning, will watch how many have the guts to admit they were wrong. I sincerely hope you realise that statements like that cut both ways.How about eating your hat? Up for that?
With 7 sets of different retraction size of the cover depth, you can get 49 kinds of different combinations for large small end retraction different depths, debugging within selected large end retraction depth 4 mm, 12 mm small end retraction depth is the best combination, at this point closest to the resonant frequency of 2.45 GHz
Some experimenters would be pretty content with about 100 uN but Tajmar gets about that in the direction at right angles to the frustum axis (labelled "Horizontal" on his graph). Having read through the foregoing posts, it seems likely that the huge waveguide orifice has something to do with this. He's basically extended the cavity geometry a little way at right angles to the frustum main axis.