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#680
by
Bob Woods
on 31 Jul, 2017 14:59
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It is known that the 90 degree connectors produce high reflections. If this is possible please don't use this component.
There will be much lower reflection when you connect the coaxial cable direct to the straight SMA connector section.
Thanks X_Ray! Easy enough to eliminate the 90 degree angle connector. I can connect SMA cable directly to the jack. 
... and this shows the immense value that this forum provides to the world. "Old dog shares old tricks." (No offense intended X-Ray
)
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#681
by
Monomorphic
on 31 Jul, 2017 20:15
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Here is the completed linear actuator. Not only can it control the antenna z-axis position, but it is also possible to rotate the antenna 360 degrees by loosening the SMA nut.
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#682
by
Bob Woods
on 01 Aug, 2017 04:01
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Has anyone heard from Phil? It's been a long while.
Hey Traveller, anything new to report? Isn't the symposium in Australia coming up soon?
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#683
by
Sjors Boomschors
on 01 Aug, 2017 21:06
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Here is the completed linear actuator. Not only can it control the antenna z-axis position, but it is also possible to rotate the antenna 360 degrees by loosening the SMA nut.
@Monomorphic
I like your postings allot, seeing you make progress on this is exiting to follow.
Wanted to trow out one idea, hope not to late to be included into the final design.
- Is the EM-Drive not suposed to be fully enclossed?
I could be wrong on this, but making a hole to adjust the antenna will give hot air a location to escape the drive cavaty and create fals trust. Did you think of a solution to prevent this in anyway?
Was thinking to prevent this by adding a harmonic / flexible air seal, to prevent hot air to excape.
The image show Suction cups or Vacuum cups probebly not best solution but will give a good idea.
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#684
by
Monomorphic
on 01 Aug, 2017 21:26
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I could be wrong on this, but making a hole to adjust the antenna will give hot air a location to escape the drive cavity and create false trust. Did you think of a solution to prevent this in anyway?
A small rubber grommet or membrane around the antenna feed hole can be used. This will surround the SMA jack as it moves and act as a seal to help prevent outgasing.
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#685
by
Monomorphic
on 01 Aug, 2017 22:21
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Images of the big-end spherical castings. A third quarter is curing in the mold now and I will have the fourth finished tomorrow. Each casting requires two pours with 12 minutes of mixing each.
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#686
by
spupeng7
on 02 Aug, 2017 07:15
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Has anyone heard from Phil? It's been a long while.
Hey Traveller, anything new to report? Isn't the symposium in Australia coming up soon?
Bob,
Phil is OK I think and the conference details are as below;
from:
http://www.iac2017.org/"Elon Musk from SpaceX will attend IAC2017 and deliver a short address to delegates on Friday afternoon 29 September. He plans to provide delegates with an update on his plans for settling Mars.
His talk will also be live-streamed globally.
Potential delegates to IAC2017 are reminded that the standard registration period ends on 20 September and that registration is for the entire period of the Congress – from 25-29 September. Registrations for one or two days are not accepted.
The exhibition is open to the general public on Friday morning from 0900-1300hrs. However, only registered delegates can attend the plenary events, including the Elon Musk's presentation."
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#687
by
Rodal
on 02 Aug, 2017 12:35
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Has anyone heard from Phil? It's been a long while.
Hey Traveller, anything new to report? Isn't the symposium in Australia coming up soon?
Bob,
Phil is OK I think and the conference details are as below;
from: http://www.iac2017.org/
"Elon Musk from SpaceX will attend IAC2017 and deliver a short address to delegates on Friday afternoon 29 September. He plans to provide delegates with an update on his plans for settling Mars.
His talk will also be live-streamed globally.
Potential delegates to IAC2017 are reminded that the standard registration period ends on 20 September and that registration is for the entire period of the Congress – from 25-29 September. Registrations for one or two days are not accepted.
The exhibition is open to the general public on Friday morning from 0900-1300hrs. However, only registered delegates can attend the plenary events, including the Elon Musk's presentation."
We were told that
2015 ,
2016 , now past mid 2017, was going to be "a very interesting year"
anything to report on if, what and when something real and interesting regarding the EM Drive is ever going to be
shown? at this conference?
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#688
by
TheTraveller
on 02 Aug, 2017 13:30
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....
Hi Jose,
No need to attend IAC 2017 as I'm working with a client to produce and fly a TRL 9 EmDrive thruster. Understand Dr Tajmar is presenting something on EmDrive at the conference.
How is your work going with Dr.Woodward?
Phil
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#689
by
Rodal
on 02 Aug, 2017 13:35
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....
Hi Jose,
No need to attend IAC 2017 as I'm working with a client to produce and fly a TRL 9 EmDrive thruster. Understand Dr Tajmar is presenting something on EmDrive at the conference.
How is your work going with Dr.Woodward?
Phil
Hi Phil, thank you for the update on Tajmar, as I did not know Tajmar was presenting more work on the EM Drive there. Looking forward to more news on his presentation
Concerning NIAC, we are presenting in the 2017 NIAC SYMPOSIUM, Denver, CO., Sep. 25-27, 2017. Public meeting, I would expect it will be broadcasted over the Internet (as it was last year in Raleigh NC):
https://www.nasa.gov/content/niac-symposium
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#690
by
jak Kennedy
on 02 Aug, 2017 15:04
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We were told that 2015 , 2016 , now past mid 2017, was going to be "a very interesting year"
anything to report on if, what and when something real and interesting regarding the EM Drive is ever going to be shown? at this conference?
Anyone have an idea of when an EM drive may fly? Not counting any classified missions.
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#691
by
Mulletron
on 02 Aug, 2017 15:55
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So I've been reading up on these "pear shaped" nuclei as research on the side not related to EmDrive but I realized that the frustum shape of the EmDrive is a octupole shape, noting that a quadrupole
or higher order moment is required for the production of gravitational radiation. I've been stuck on accelerating quadrupoles this whole time (older posts) but what we really have here are octupole moments. An interesting difference between the quadrupole and octupole moments is that an octupole points in a definite direction.
http://www.nature.com/news/pear-shaped-nucleus-boosts-search-for-new-physics-1.12952In the image below, note the orientation of the higher density (deep red areas) and the direction of thrust and the difference between left and right.
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#692
by
Rodal
on 02 Aug, 2017 16:12
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So I've been reading up on these "pear shaped" nuclei as research on the side not related to EmDrive but I realized that the frustum shape of the EmDrive is a octupole shape, noting that a quadrupole or higher order moment is required for the production of gravitational radiation. I've been stuck on accelerating quadrupoles this whole time (older posts) but what we really have here are octupole moments. An interesting difference between the quadrupole and octupole moments is that an octupole points in a definite direction.
http://www.nature.com/news/pear-shaped-nucleus-boosts-search-for-new-physics-1.12952
In the image below, note the orientation of the higher density (deep red areas) and the direction of thrust and the difference between left and right.
The standard terminology for TE21p or TM21p modes is to call them
quadrupoles, since they have 4 alternating poles around the circumference
T. Damour quotes Maxwell as the originator of this terminology, which comes from the intersection of rays into a spherical surface forming "poles". The EM Drive (particularly when using a spherical end) resonance can be best analyzed with spherical waves, and
the number of "poles" are counted in the mode shape as seen in the circular cross-section perpendicular to the longitudinal axis.
TE012p or TM012p is a monopole
TE11p or TM11p is a dipole
TE21p or TM21p is a quadrupole
The number of poles in a TEm1p or TMm1p mode shape is thus given by = 2*m, two times the first number appearing in the mode shape identificationAn octupole would thus be given by a mode shape TE41p or TM41p which are mode shapes significantly higher in resonant frequency than the monopoles and quadrupole mode shapes.
The mode shape most used by NASA (TM212) is thus a quadrupole.
The mode shapes most used by Shawyer, Yang, and others (TE012 and TE013) are monopoles.
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#693
by
Mulletron
on 02 Aug, 2017 16:46
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Rodal, since I'm talking about the production of gravitational radiation, I'm referring to distributions of mass/energy in 3d.
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#694
by
Rodal
on 02 Aug, 2017 16:55
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Rodal, since I'm talking about the production of gravitational radiation, I'm referring to distributions of mass/energy in 3d.
The terminology is the same in General Relativity. It has to do with the intersection of rays emanating from the inside into a ball's spherical surface producing "poles" on the spherical surface. It is the same terminology used by Thibault Damour, one of the main people in GR (responsible for the 3PN, and 4PN, for gravitational waves from compact binary systems, and with Alessandra Buonanno, he invented the "effective one-body" approach to solving the orbital trajectories of binary black holes.) who attributes the terminology to Maxwell, originally for electromagnetic waves.
Same terminology for quadrupoles used by Kip Thorne and everybody in General Relativity
Here is a drawing of a quadrupole gravitational wave:
By the way, according to Einstein's General Relativity the minimum number of poles for a gravitational wave is 4 (quadrupole).
However, scalar tensor theories may allow for monopole gravitational waves (which are heretofore undetected).
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#695
by
Rodal
on 02 Aug, 2017 17:11
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#696
by
Bob012345
on 02 Aug, 2017 18:21
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....
Hi Jose,
No need to attend IAC 2017 as I'm working with a client to produce and fly a TRL 9 EmDrive thruster. Understand Dr Tajmar is presenting something on EmDrive at the conference.
How is your work going with Dr.Woodward?
Phil
Hi Phil, thank you for the update on Tajmar, as I did not know Tajmar was presenting more work on the EM Drive there. Looking forward to more news on his presentation
Concerning NIAC, we are presenting in the 2017 NIAC SYMPOSIUM, Denver, CO., Sep. 25-27, 2017. Public meeting, I would expect it will be broadcasted over the Internet (as it was last year in Raleigh NC): https://www.nasa.gov/content/niac-symposium
I know you are interested in scaling up the effect but are you and the team expanding the search beyond PZT stacks?
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#697
by
Bob Woods
on 02 Aug, 2017 21:27
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Hi Phil, thank you for the update on Tajmar, as I did not know Tajmar was presenting more work on the EM Drive there. Looking forward to more news on his presentation
Concerning NIAC, we are presenting in the 2017 NIAC SYMPOSIUM, Denver, CO., Sep. 25-27, 2017. Public meeting, I would expect it will be broadcasted over the Internet (as it was last year in Raleigh NC): https://www.nasa.gov/content/niac-symposium
Dynamite. I'm planning on attending the NIAC Symposium. I hope to see you and others there.
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#698
by
JonathanD
on 03 Aug, 2017 03:29
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Dynamite.
Look, I'm just layman, but I REALLY don't think that's a good idea
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#699
by
Bob Woods
on 03 Aug, 2017 03:56
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Dynamite.
Look, I'm just layman, but I REALLY don't think that's a good idea
I guess I could follow Freeman Dyson and go nuclear.
)
