December 22, 2016
"This technology is currently in the latter stages of the proof-of-principle phase, with the goal of making the technology available in satellite engineering as quickly as possible," Li Feng explained at the press conference.
Posted by: Pixy Misa at Thu Dec 22 20:54:40 2016 (PiXy!)
Incidentally, here's the "Chinese" drive featured in the article. As used in Discover Magazine in 2014. Exact same picture. A picture provided by the sales and marketing guy who's taken over trying to sell the EmDrive.
So......I call complete and utter bunk on the whole story.
Posted by: Ben at Thu Dec 22 22:43:41 2016 (S4UJw)
Preemptive comment: I used the link editor. Don't forget, it doesn't work right in modern browsers, so advance apologies if it looks bad.
Posted by: Rick C at Fri Dec 23 15:53:10 2016 (ECH2/)
As I said in the post, I'm quite skeptical. But my skepticism is not quite on Pixy's level, being just over 9000. It looks like it could be producing thrust via the same way a lightbulb does or it's the RF equivilent of a Dean Drive...stuff bouncing around and it's a tad off balance like a badly loaded washing machine...but with radio. This would make it useless or worse. Note that the thrust is in millinewtons...MILLINEWTONS.
The Chinese claim seems to imply a certain practicality that had heretefore eluded anyone, which is what inspired the post. There are three potential reasons for the Chinese press release.
1: The Chinese discovered something interesting.
2: There is a translation glitch.
3: The Chicoms are lying (as Chicoms will).
I think that the probability here is weighted towards two and three, but some interest is still warranted.
Posted by: The Brickmuppet at Fri Dec 23 19:33:49 2016 (KicmI)
Posted by: David at Sat Dec 24 00:37:35 2016 (9UHFZ)
But because the effect is claimed in a little microwave device running at a few tens of watts, not an enormous particle collider or a supernova or something, the energy of the particle itself would also be small. Noether's Theorem lets us calculate the energy, and it's low enough that the particle would have been discovered in the first cyclotron experiments back in the 1930s. Since it wasn't, either Noether's Theorem is wrong (and it's fundamental to most of modern physics) or the EM Drive doesn't work.
So if the EM Drive works, then the computer I'm using to type this comment doesn't, and vice-versa.
Posted by: Pixy Misa at Sat Dec 24 03:21:36 2016 (PiXy!)
The EM Drive supposedly generates force without reaction, you just need energy. Put X amount of energy in, you accelerate by Y amount.
Y is very small, but that's okay, use nuclear power (an RTG or a full fission reactor) and you can keep the thing running as long as you want.
But while the energy required to accelerate the EM Drive to a given velocity is proportional to that velocity, the kinetic energy of the object moving at that velocity is proportional to the square of the velocity. At some point, as you keep accelerating, the EM Drive becomes a magical free-energy device.
That's why no serious physicist gives this thing the time of day. It violates every law of physics in ways that would be obvious from a million previous experiments if they were possible.
Posted by: Pixy Misa at Sat Dec 24 03:31:12 2016 (PiXy!)
Posted by: Karl at Sat Dec 24 05:21:39 2016 (1FrBd)
Posted by: Pixy Misa at Sat Dec 24 05:45:34 2016 (PiXy!)
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