Quote from: deltaMass on 07/28/2015 02:09 pmIt's a shame that Tajmar, being Director of an institute with access to fine equipment and trained staff, did such a shoddy job. 1. Not self-contained2. Not correctly impedance matched3. Thermal effects not analysed4. Bloody great hole in the side of the frustum.He's a good theoretician, but struggles as an experimenter. We all have our strengths and weaknesses.I would beg you to be more precise about (3). Tajmar did account for thermal effects and did alot to remove them from their measurements. In the Ambient air balance beam measurements they wrapped the entire thing in glass wool placed it in a sealed aluminium box which was stuffed with more glass wool to prevent thermal air currents. In the torsion balance test the whole chamber was evacuated. And since there was an adjustable hole on the narrow end I doubt it was air tight which means the entire frustum would also have been evacuated.
It's a shame that Tajmar, being Director of an institute with access to fine equipment and trained staff, did such a shoddy job. 1. Not self-contained2. Not correctly impedance matched3. Thermal effects not analysed4. Bloody great hole in the side of the frustum.He's a good theoretician, but struggles as an experimenter. We all have our strengths and weaknesses.
Yang-Shell - 229x196x196 This is the final summary output from the log file.run 0 finished at t = 13.054 (6527 timesteps)Total number of slices 14, the last 14 of 32 full cycles, or periods at 0.1 period intervals. That is, at 30.7, 30.8 and so forth to 32.0 periods of the drive center frequency.Number of time steps, 6527 and total meep time = 13.054 time units.
Fair enough, but the fact that "thrust" persisted for a long time after RF power was switched off means that perhaps the entire magnitude of the "thrust" could be accounted for by heat. That's clearly not how you want measurements to work.
Quote from: birchoff on 07/28/2015 02:25 pmQuote from: deltaMass on 07/28/2015 02:09 pmIt's a shame that Tajmar, being Director of an institute with access to fine equipment and trained staff, did such a shoddy job. 1. Not self-contained2. Not correctly impedance matched3. Thermal effects not analysed4. Bloody great hole in the side of the frustum.He's a good theoretician, but struggles as an experimenter. We all have our strengths and weaknesses.I would beg you to be more precise about (3). Tajmar did account for thermal effects and did alot to remove them from their measurements. In the Ambient air balance beam measurements they wrapped the entire thing in glass wool placed it in a sealed aluminium box which was stuffed with more glass wool to prevent thermal air currents. In the torsion balance test the whole chamber was evacuated. And since there was an adjustable hole on the narrow end I doubt it was air tight which means the entire frustum would also have been evacuated.Fair enough, but the fact that "thrust" persisted for a long time after RF power was switched off means that perhaps the entire magnitude of the "thrust" could be accounted for by heat. That's clearly not how you want measurements to work.
All things considered about Tajmar's test I think the most interesting question I would have is if Tajmar intends to continue testing the EmDrive and what changes do they envision making to their test procedure.
“I'm a fan of a web of beamers. These are high power solar-powered lasers and the beams crisscross the solar system. They are of course dynamically steerable. It is like laying down an infrastructure of tramlines. They enable both acceleration and braking. They would greatly help in opening up interplanetary space.”The inverse square law is NOT your friend.
Please ask him if he will be doing any further testing first of all. He might just want to walk away from this tar-baby. If he does want to continue, I'd like to know if he plans to go fully self-contained using battery power.
Well his paper is already hitting the click-bait sites.http://www.ign.com/articles/2015/07/28/impossible-em-propulsion-engine-confirmed-by-scientistsPerhaps we should just close this thread for a week and start up where we left off after the trolls scamper home....
...Question for the magnetron DIYers. How will you get your Q to 50 so your frustum will accept all the magnetron energy. If it is higher than 50, the bandwidth may not be wide enough for your magnetron.Give me a narrow band Rf signal that will allow the frustum to be tuned to a Q exceeding 100K and a VSWR feedback signal to track and adjust to cavity resonance changes. My 100W amp is on the water. I'm so thankful that my mate found it.
It's a shame that Tajmar, being Director of an institute with access to fine equipment and trained staff, did such a shoddy job.1. Not self-contained2. Not correctly impedance matched3. Thermal effects not analysed4. Bloody great hole in the side of the frustum.He's a good theoretician, but struggles as an experimenter. We all have our strengths and weaknesses.
Next steps include better magnetic shielding, further vacuum tests and improved EMDrive models with higher Q factors and electronics that allow tuning for optimal operation. As a worst case we may find how to effectively shield thrust balances from magnetic fields.
Prof. Tajmar is at a University. He does contract research funded by Airbus, aerospace companies and institutes. Whether he continues this research or not is a function of whether he continues being funded for it, pure and simple. The report itself hints that (if funding continues) they will continue this research.
Didn't someone mention this particular thread was due for closure anyway due to length?
Re Post #5473 by deltaMass"That is correct. It is also correct that a parallel beam does not obey that law."Agree 100%. Has anyone ever seen an example of such a thing? I. e., a free space beam of electromagnetic energy of any frequency whose power density was constant at all distances from the source?