Nasa's EM Drive: Peer Reviewed Paper

I thought that it is simply that if it does work, it is pushing something out, we just don't know exactly what it is. Probably photons, the same principle as the solar sail, as (in fact) scientists at Helsinki University have theorized, and as (in fact) an earlier (June 2016) Sciencealert article with nearly the same wording said.

http://www.sciencealert.com/new-paper-claims-that-the-em-drive-doesn-t-defy-newton-s-3rd-law-after-all

I just hope they are right that it is going to work in space.

There was a discussion (and a thorough debunking ) of this technology on this forum earlier this year.

Well it's too late to delete the thread.

I just read it had been retested and it works? Sounds dipshit crazy to me

Well, I grew up reading Phillip Jose Farmer and watching Disney cartoons. Everything seems possible to me.

It would be awesome if it would work. I'm no physicist, so if the report is full of sciency sounding words I'm all for it. It's just that I brought this up a while back full of hope for the near future of space travel and those actually knowledgeable in physics gave a list of reasons that this was BS.

I think it needs some real scale testing. I always thought that the reason for the conflict with "action reaction" was that the propogating wave guides do not EVER maintain parallel positions in order to generate the photon pairs. This chops the efficiency by huge amounts.

Course that was last years papers

What is NASA Eagleworks Lab? Is that a department in NASA or is it a consulting agency?

http://www.forbes.com/sites/briankoberlein/2016/11/19/nasas-physics-defying-em-drive-passes-peer-review/#61b451f876e2
Forbs website:
It’s important to note that passing peer review means that experts have found the methodology of the experiments reasonable. It doesn’t guarantee that the results are valid, as we’ve seen with other peer-reviewed research such as BICEP2. But this milestone shouldn’t be downplayed either. With this new paper we now have a clear overview of the experimental setup and its results. This is a big step toward determining whether the effect is real or an odd set of secondary effects. That said, what does the research actually say?

The basic idea of the EMDrive is an asymmetrical cavity where microwaves are bounced around inside. Since the microwaves are trapped inside the cavity, there is no propellent or emitted electromagnetic radiation to push the device in a particular direction, standard physics says there should be no thrust on the device. And yet, for reasons even the researchers can’t explain, the EM Drive does appear to experience thrust when activated. The main criticism has focused on the fact that this device heats up when operated, and this could warm the surrounding air, producing a small thrust. In this new work the device was tested in a near vacuum, eliminating a major criticism.

The relation of thrust to power for the EM Drive. Credit: Smith, et al.
The relation of thrust to power for the EM Drive. Credit: Smith, et al.

What the researchers found was that the device appears to produce a thrust of 1.2 ± 0.1 millinewtons per kilowatt of power in a vacuum, which is similar to the thrust seen in air. By comparison, ion drives can provide a much larger 60 millinewtons per kilowatt. But ion drives require fuel, which adds mass and limits range. A functioning EM drive would only require electric power, which could be generated by solar panels. An optimized engine would also likely be even more efficient, which could bring it into the thrust range of an ion drive.

Grahn, Annila and Kolehmainen at the University of Helsinki have published a paper "On the exhaust of electromagnetic drive" where they suggest that the measured effect could be produced by paired opposite-phase photons being ejected from the cavity. (i.e. it's a photon rocket). These would cancel out each other's electromagnetic fields and thus be invisible from an electromagnetic point of view, but, they say, the photons do not vanish.They emphasise that their "proposal for the paired-photon exhaust is by no means an exclusive explanation".

http://scitation.aip.org/content/aip/journal/adva/6/6/10.1063/1.4953807

Long thread at nasaspaceflight.com

https://forum.nasaspaceflight.com/index.php?topic=39772.3220

and another:

https://forum.nasaspaceflight.com/index.php?PHPSESSID=llr7dvib5u129uq52ga4bfdf82&topic=39772.4200

This.

The Advanced Propulsion Physics Laboratory at NASA's Johnson Space Center, also known as "Eagleworks", is a small research group investigating a variety of fringe theories regarding novel forms of spacecraft propulsion.

Their research includes the investigation of the EmDrive[1] and the Quantum Vacuum Plasma Thruster,[2] both claimed by their inventors to be reactionless drives.

Their principal investigator is Dr. Harold "Sonny" White.
https://en.wikipedia.org/wiki/Advanced_Propulsion_Physics_Laboratory

Are the photons propagated from the outer surface of the housing?

No.

ah yes, I see. I forgot that equations do not necessarily define exclusivity of solution.

A nice analysis by ARS Technica: http://arstechnica.com/science/2016/11/nasas-em-drive-still-a-wtf-thruster

I thought they were going to launch an experimental EM Drive into space in 2018. I don't think it happened. As near as I can tell, they pushed the launch to 2019 sometime, and they may be trying to crowdfund it.

I think this is a great scam. These guys ( http://cannae.com ) have come up with a way to gather investors and employ themselves for years on nothing but vaporware and grand promises. Almost like a Congressman.

Here's a nice article that came out in May 2018 which pretty much debunks the whole EM Drive scam.

Enjoy: https://arstechnica.com/science/2018/05/nasas-em-drive-is-a-magnetic-wtf-thruster