The Frank Davies mode analysis (attached) did a really good covering most of the frustum TEmnp and TMmnp modes.TE013 is missing and may be of interest as the E field intensity at the small end may be very large.Can anybody supply the E and H field analysis as NASA did but for the missing TE013 mode? It will be worth your time.
Is there any particular reason why you are interested in TE013 ?
1) UL certified Copper epoxy will be used to join the 2 end flanges to the frustum and then cover the butt joint.http://www.supergluecorp.com/super-glue/epoxies/copper-bond Does anyone have an opinion on this joining method?
Quote from: zen-in on 05/25/2015 05:04 pmQuote from: TheTraveller on 05/25/2015 12:04 pmQuote from: Paul Novy on 05/25/2015 11:52 amQuote from: TheTraveller on 05/25/2015 11:37 am...QuoteSafe and easy to use Copper-Bond® is UL listed for joining copper tube used in fire sprinkler systems and NSF approved for hot and cold water systems.As my max power input is 100W, I feel the joint temperatures should be well with-in the UL rating.There will also be alum supporters as per the 1st Experimental device, so will get additional surface area to radiate heat. All this will be inside a sealed Faraday Cage as Shawyer used.
Quote from: TheTraveller on 05/25/2015 12:04 pmQuote from: Paul Novy on 05/25/2015 11:52 amQuote from: TheTraveller on 05/25/2015 11:37 am...
Quote from: Paul Novy on 05/25/2015 11:52 amQuote from: TheTraveller on 05/25/2015 11:37 am...
Quote from: TheTraveller on 05/25/2015 11:37 am...
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Safe and easy to use Copper-Bond® is UL listed for joining copper tube used in fire sprinkler systems and NSF approved for hot and cold water systems.
Quote from: TheTraveller on 05/25/2015 05:17 pm1) UL certified Copper epoxy will be used to join the 2 end flanges to the frustum and then cover the butt joint.http://www.supergluecorp.com/super-glue/epoxies/copper-bond Does anyone have an opinion on this joining method?I would solder or plate, as was recommended. The glue, from the MSDS, is 90-100% epoxy. Surely is non-conductive, not to mention that because of the skin effect even conductive glue particles could be resistive and a place for Q attenuation and arcing.I wonder if Nasa was limited to 30W because of arcing in the vacuum chamber? That what killed their RF amp? A low mode high-Q cavity may high problems around sharp points and edges.Didn't one of the photos closeups of the inside of Shawyers frustrum show a link-coupling near the inside of the cavity wall? It was a dozen or so pages back in the 2nd thread.I'm half-ready to build one of these. I'll have a look at Meep and simulating it, then buzzing out some flimsy hastily-built cavities to figure out the feedpoint.
Quote from: TheTraveller on 05/25/2015 05:17 pmQuote from: zen-in on 05/25/2015 05:04 pmQuote from: TheTraveller on 05/25/2015 12:04 pmQuote from: Paul Novy on 05/25/2015 11:52 amQuote from: TheTraveller on 05/25/2015 11:37 am...QuoteSafe and easy to use Copper-Bond® is UL listed for joining copper tube used in fire sprinkler systems and NSF approved for hot and cold water systems.As my max power input is 100W, I feel the joint temperatures should be well with-in the UL rating.There will also be alum supporters as per the 1st Experimental device, so will get additional surface area to radiate heat. All this will be inside a sealed Faraday Cage as Shawyer used.The UL rating is immaterial to your application. Plumbing fittings are inherently much stronger than all other types because one tube is inside the other. Since you will be using the epoxy like putty the advertised strength will not be there. One option to consider is to assemble the parts and hold it together with light gauge iron wire before soldering it. Wrapping the wire around everything will hold it in place when it is soldered. The Copper doesn't expand very much when lead solder is used.
Quote from: Rodal on 05/25/2015 06:25 pmIs there any particular reason why you are interested in TE013 ?More breadcrumbs have appeared Was told by Roger Shawyer to use TE013 mode to design my Flight Thruster replication. He said otherwise I was on the right track. Appears he is monitoring this forum.
@WarpTech raises a very good point. Any system which provides propellant-less acceleration should also work as an accelerometer. Photon resonators are already used as accelerometers. (and by extension, gravity wave detectors)
Quote from: TheTraveller on 05/25/2015 06:30 pmQuote from: Rodal on 05/25/2015 06:25 pmIs there any particular reason why you are interested in TE013 ?More breadcrumbs have appeared Was told by Roger Shawyer to use TE013 mode to design my Flight Thruster replication. He said otherwise I was on the right track. Appears he is monitoring this forum.Mode Shape Rodal Exact solution (GHz) NASA COMSOL FEA solution (GHz) Difference TE011 1.78972 1.77048 1.08%TE012 2.20244 2.1794 1.05%TE013 2.65493 ? ?Note: Rodal solution has spherical ends, COMSOL FEA has flat ends.Geometrical dimensions: bigDiameter = 11.00 inches used by Rodal, 11.01 inches used by Jerry Vera for his COMSOL FEA solutionsmallDiameter = 6.25 inches; axialLength = 9 inches;spherical coordinate r1 = 0.300789 metersspherical coordinate r2 = 0.529389 meters cone half angle = 14.7827 degreesspeed of light in medium = 299792458 meter/second (Vacuum)
..If worried about the shift away from resonance due to thermal expansion in a high-Q frustum, would a useful remedy be to choose a longer wavelength, and larger frustum, so that the deformation is a small portion of a wavelength? Now, I understand that there may be other reasons to want to operate at a shorter wavelength (more power)...
There's much on this subject I don't understand. I feel like if I had another twenty years to study this, I might be able to have a better grasp.But there are some things I might be able to address, because of some of the practical experience I've had in RF. If worried about the shift away from resonance due to thermal expansion in a high-Q frustum, would a useful remedy be to choose a longer wavelength, and larger frustum, so that the deformation is a small portion of a wavelength? Now, I understand that there may be other reasons to want to operate at a shorter wavelength (more power).I have noted that Shawyer uses a silicon carbide structural base, and then plates this with a superconductor. Silicon carbide is very stiff in regards to temperature changes (note: now it can also be 3D-printed). At what wavelengths is it sufficiently stiff at a superconducting temperature?
Hm. As has been noted many times both Sawyer and Yangs experiments are ran at atmospheric pressure and are furthermore (as far as anyone can tell) well sealed...One defence for this hypotheses is the difference in measured effects between the Yang and Sawyer devices and the Eagleworks vacuum tests.
To me, this is a really crucial bit of info. If these devices loose this much performance in a vacuum, then are they really all that superior to a photon rocket? ...
In this regard it is interesting that Prof. Yang want the reader to consider the case of a gas of charged particles inside the EM Drive as a means to understand how it is able to accelerate without breaking the law of Conservation of Momentum.As Todd has been writing, for the EM Drive there appears to be the need of a balance between high Q resonance and absorption. If there is a gas (air) inside the cavity that has charged particles (some ionization produced within the Microwave cavity), and whose molecules can be segregated by the electric field, then so much the better for this process of amplification (just like in the Maser).
Would like to thank everyone for such diversified input on this since I have been silently following this topic since "thread one". Personally, I have a deep respect for each persons current thoughts on this.While I do realize that this is "Way out there!".Is it possible that whatever reactions/movements AKA "Thrust" could be being caused by the inverse of what's being done to slow down atoms using frequencies of light Atomic telescope brings atoms to standstill by using microwave frequencies to excite virtual particles, dark matter or even dark energy?I ask because this also seems to at least potentially show a classical to quantum transition taking place in some form. Unless it turns out that all prior experiments have had the same non discovered faults/flaws inside and outside a vacuum. Don