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Talk-Polywell.org • EM Drive - Page 34
Page 34 of 48

Re: EM Drive

Posted: Thu May 12, 2016 12:32 pm
by Carl White

Re: EM Drive

Posted: Thu May 12, 2016 7:13 pm
by ladajo
Hmmm. Reversal seen. I hope the report is telling.

Re: EM Drive

Posted: Tue Jun 28, 2016 2:12 pm
by Diogenes

Re: EM Drive

Posted: Tue Jun 28, 2016 3:19 pm
by Skipjack
Well, if it is just another photon drive, then it is doomed to have impractically low thrust.

Re: EM Drive

Posted: Tue Jun 28, 2016 4:24 pm
by hanelyp

Re: EM Drive

Posted: Tue Jun 28, 2016 7:14 pm
by Giorgio
Additionally the thrust that they claim to have observed at those applied power levels cannot be explained by photon thrust.
So either the reading (or measurement set up) is wrong or this theory is not applicable to what's happening there.

Re: EM Drive

Posted: Wed Jun 29, 2016 4:57 pm
by ScottL
If we're discussing the basic emDrive and not assuming the above, the most robust and rigorous experimental result measurements have trended to 0. At this point, most of the hype is gone. If we're now considering the above, then as mentioned, this thing is useless and the numbers are clearly being fudged. I'd also point out that Cannae now offers to test other entity's devices for thrust. I find this most comical. If you have a groundbreaking tech that you're researching, why hold everything to run tests for other people's work? From a break-through standpoint, this seems silly. From a business standpoint, this is pivoting when your original plan didn't work out like you had hoped.

Pivoting:

Re: EM Drive

Posted: Thu Jun 30, 2016 9:24 pm
by JoeP

Re: EM Drive

Posted: Fri Jul 01, 2016 12:28 am
by zapkitty

Re: EM Drive

Posted: Fri Jul 01, 2016 3:14 pm
by kunkmiester
My brother pointed out torsion pendulums capable of handling that kind of weight while still holding the necessary accuracy shouldnt be too terrobly common or too easy to make--most low thrust systens lIke Hall effect thrustern arent nearly as big. It would be sensible having spent some time and effort to build it to share it, especially if you can get some revenue out of it.

Of course all the other stuff does too.

Re: EM Drive

Posted: Fri Jul 01, 2016 4:29 pm
by ScottL

Re: EM Drive

Posted: Mon Aug 22, 2016 8:24 pm
by Carl White

Re: EM Drive

Posted: Mon Aug 22, 2016 11:18 pm
by ScottL

Re: EM Drive

Posted: Tue Aug 23, 2016 12:44 am
by hanelyp
A clearer test result would be if the thruster could measurably raise the orbit, not just counter drag with a great deal of variation at the altitude in question. The cynic in me questions if this sub-standard test is deliberate, when a proper test at higher altitude would not be much harder.

Re: EM Drive

Posted: Tue Aug 23, 2016 11:58 am
by RERT
Can you quote me their claims of thrust? There are no press releases on their website with any claims that I can see.

The force required to maintain orbit is not high (I think 30-230 micronewtons), but this has to be sustained over six months. If they are determined to cheat, they can certainly do that with off-the-shelf cubesat thrusters.

Without thrust, I believe the thing would fall to earth in a few days from 150 miles. Though small, the drag at that altitude is high by orbital standards: going down from 400km LEO to 240km greatly increases the drag. If there is nothing but an EMdrive on the satellite, you actually have a very quick test result, if you believe they are not cheating.

If it flies for long enough, the drive is categorically working, whether or not you think they might try to cheat. Lowering the flight altitude shortens the duration of 'long enough'. A determined skeptic might need some years to be convinced, I guess.

Why would they spend the money to put it in orbit without having measured ample thrust for the mission in the lab?

They could maybe be crazy and/or crooked, like Rossi, but let's hope not.