Quote from: RareSaturn on 06/14/2015 10:24 amData from second Baby EmDrive testhttps://hackaday.io/project/5596-em-drive/log/19468-torsion-test-2-data It seems that they no longer use the magnetic suspension as in their first test. That's good since the magnetic field could have coupled with the rest of the assembly and transmit momentum to it. Did they explain their reasons for abandoning the magnetic suspension ? I can't find anything on their web site.
Data from second Baby EmDrive testhttps://hackaday.io/project/5596-em-drive/log/19468-torsion-test-2-data
Quote from: RareSaturn on 06/14/2015 10:24 amData from second Baby EmDrive testhttps://hackaday.io/project/5596-em-drive/log/19468-torsion-test-2-dataUsing their data, I plotted maxima and minima, then averaged: ave(t) = [min(t)+max(t-1)]/2. Thruster on/off times were interpreted from hackaday plot.
Second test of the baby EM drive and problems with oscillation. I think they are looking for suggestions to resolve this?https://www.youtube.com/watch?v=Y8uyIgzdzS4&feature=youtu.beMore info.https://hackaday.io/project/5596-em-drive/log/19417-torsion-test-no-data-due-to-oscillations
Quote from: Prunesquallor on 06/14/2015 04:28 pmQuote from: RareSaturn on 06/14/2015 10:24 amData from second Baby EmDrive testhttps://hackaday.io/project/5596-em-drive/log/19468-torsion-test-2-dataUsing their data, I plotted maxima and minima, then averaged: ave(t) = [min(t)+max(t-1)]/2. Thruster on/off times were interpreted from hackaday plot.Thank you for taking the time to do that.What information do you gather from this exercise? Do you get information here pointing towards the EM Drive displaying what has been claimed as thrust by other researchers ?To me it seems like a null test, with a lot of noise and no thrust signal.
Quote from: Rodal on 06/14/2015 05:06 pmQuote from: Prunesquallor on 06/14/2015 04:28 pmQuote from: RareSaturn on 06/14/2015 10:24 amData from second Baby EmDrive testhttps://hackaday.io/project/5596-em-drive/log/19468-torsion-test-2-dataUsing their data, I plotted maxima and minima, then averaged: ave(t) = [min(t)+max(t-1)]/2. Thruster on/off times were interpreted from hackaday plot.Thank you for taking the time to do that.What information do you gather from this exercise? Do you get information here pointing towards the EM Drive displaying what has been claimed as thrust by other researchers ?To me it seems like a null test, with a lot of noise and no thrust signal.It's pretty noisy. I might believe that I see depression of the mean during the first long thruster on-time. But I would have to want to believe.If anyone knows of a better technique of extracting S/N that Excel could handle, I'd be will to try.
Quote from: Prunesquallor on 06/14/2015 05:12 pmQuote from: Rodal on 06/14/2015 05:06 pmQuote from: Prunesquallor on 06/14/2015 04:28 pmQuote from: RareSaturn on 06/14/2015 10:24 amData from second Baby EmDrive testhttps://hackaday.io/project/5596-em-drive/log/19468-torsion-test-2-dataUsing their data, I plotted maxima and minima, then averaged: ave(t) = [min(t)+max(t-1)]/2. Thruster on/off times were interpreted from hackaday plot.Thank you for taking the time to do that.What information do you gather from this exercise? Do you get information here pointing towards the EM Drive displaying what has been claimed as thrust by other researchers ?To me it seems like a null test, with a lot of noise and no thrust signal.It's pretty noisy. I might believe that I see depression of the mean during the first long thruster on-time. But I would have to want to believe.If anyone knows of a better technique of extracting S/N that Excel could handle, I'd be will to try.this help any?http://www.bostonaudiosociety.org/articles/extracting_data_from_excel.htm
Quote from: SeeShells on 06/14/2015 05:33 pmAnd a Happy Fathers Day to all the Fathers!Father's day is Sunday, June 21 in the USA (I just asked my children )
And a Happy Fathers Day to all the Fathers!
... Imagine the space shuttle in orbit. The cargo bay doors are open. An astronaut equipped with an MMU fires his gas jets, accelerates from space outside the shuttle, and smacks into the back wall of the cargo bay. The astronaut transfers his momentum to the shuttle, and recieves a concussion for his trouble.The momentum flow is Gas from the Jets go left, shuttle goes right. CoM is satisfied.Two asprin later the astronaut+mmu is in the cargo bay with the bay doors closed and sealed. The bay is a hard vacuum. The astronaut reluctantly fires the MMU jets and smacks into the back wall again. A small amount of momentum is transferred to the shuttle, and the astronaut rethinks his "glamorous" career with Nasa.For conservation of momentum to be satisfied the force of the gas striking the inside of the cargo bay must exactly balance the force of the shuttle to the right for there to be no net momentum change. This exact balance of gas pressure does not match my understanding of gas behavior at all. I expect instead to see the all kinds of non-Newtonian action in the gas as it expands randomly into the bay in all directions. Turbulence and brownian motion will rob energy out of the gas literally left and right.I also don't see what would prevent the astronaut from pulling out a vacuum pump and compressing it back into the MMU's cylinders for another shot....
I added the TE012 NASA test without dielectric insert that registered no thrust force to the EM Drive Experimental Results wiki:http://emdrive.wiki/Experimental_Resultsincluding a note reading: "@TheTraveller made an argument that the test may have been conducted at the wrong (too low) frequency for resonance"QUESTION: does anybody have a link to TheTraveller's message where he points out that the test may have been conducted at the wrong frequency, so that the note can link to the message? Thanks
QUESTION: does anybody have a link to TheTraveller's message where he points out that the test may have been conducted at the wrong frequency, so that the note can link to the message? Thanks
Quote from: Rodal on 06/14/2015 02:01 pmQUESTION: does anybody have a link to TheTraveller's message where he points out that the test may have been conducted at the wrong frequency, so that the note can link to the message? ThanksIn this post and the following:http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382477#msg1382477