3 ms·

https://translate.google.com/translate?hl=en&ie=UTF8&prev=_t&sl=de&tl=en&u=http://www.golem.de/news/em-drive-der-warp-antrieb-muss-noch-warten-1606-121641.html

https://translate.google.com/translate?hl=en&ie=UTF8&prev=_t&sl=de&tl=en&u=http://www.golem.de/news/em-drive-der-warp-antrieb-muss-noch-warten-1606-121641.html https://translate.google.com/translate?hl=en&ie=UTF8&prev=_t... The critical passages - translated by myself Page 2: The hint: "Again it showed the same behavior - until the drive was directed towards the top for testing purposes. Usually, the drive is put on a torsion balance in a way that it can best turn the scale left or right. With the drive directed towards the top nothing should be measurable. [...] However, the drive directed toward the top in this experiment still showed the same force as when directed to the left." The test result at TU Dresden, Germany: "Tjalmar said: 'I can't say I proved or refuted the EM drive'" (because they didn't have the means to test it with a battery instead of an external power supply) Reference to a follow-up from a Chinese university: "But a research group from China did the necessary to refute it. As soon as the EM drive doesn't get its power from a cable outside [i.e., it get's its power from a battery], there is no measurable force anymore." The link to the Chinese paper http://www.tjjs.casic.cn/ch/reader/create_pdf.aspx?file_no=20160220&flag=1&journal_id=tjjs&year_id=2016 http://www.tjjs.casic.cn/ch/reader/create_pdf.aspx?file_no=2... The final sentence of the abstract: "Within the measuring range of three-wire torsion pendulum thrust measurement system，the independent microwave thruster propulsion device did not detect significant thrust. Measurement results fluctuate within ± 0.7mN range under the conditions 230W microwave power output，and the relative uncertainty is greater than 80%"

aargh_aargh 10y ago
So... you're saying all we need to do is pull an extension cord behind our spacecraft? Unlimited powahhh!
- chris_wot 10y ago
  Sort of like an electric mower with a power cord?
  - snissn 10y ago
    A mower has wheels against the ground that create the force for its propulsion, in space, there's no grass, man!
    - chris_wot 10y ago
      Are you saying there is no grass anywhere else in the universe?
- jerf 10y ago
  That's basically the thinking behind the laser-propulsion plan. The rocket equation gets a lot less hostile when the engine is not mounted on the rocket, but that has its own practical issues. Less than trying to drag a literal cord, of course.
  - neutronicus 10y ago
    Just building a kilometer-wide lens to keep it focused and a several-Terawatt power source. Space travel. Shit's hard.
  - jerf 10y ago
    (Six hours later correction: I should have said when the fuel is not in the vehicle.)
- jsprogrammer 10y ago
  https://en.m.wikipedia.org/wiki/Electrodynamic_tether https://en.m.wikipedia.org/wiki/Electrodynamic_tether
zyxzevn 10y ago
Thanks. Looks like the wires create the push with magnetic fields.
rurban 10y ago
Cannot you write at least name right? The Austrian experimental physicist https://en.wikipedia.org/wiki/Martin_Tajmar https://en.wikipedia.org/wiki/Martin_Tajmar is a legend already, since he measured in 2002 a gravitomagnetic effect in spinning superconductors at Seibersdorf, but this sensational effect is also probably just bad experimental setup and not a new gravitational theory. He is the author of the classic book "Advanced Space Propulsion Systems".

aargh_aargh 10y ago

So... you're saying all we need to do is pull an extension cord behind our spacecraft? Unlimited powahhh!

chris_wot 10y ago
Sort of like an electric mower with a power cord?
- snissn 10y ago
  A mower has wheels against the ground that create the force for its propulsion, in space, there's no grass, man!
  - chris_wot 10y ago
    Are you saying there is no grass anywhere else in the universe?
jerf 10y ago
That's basically the thinking behind the laser-propulsion plan. The rocket equation gets a lot less hostile when the engine is not mounted on the rocket, but that has its own practical issues. Less than trying to drag a literal cord, of course.
- neutronicus 10y ago
  Just building a kilometer-wide lens to keep it focused and a several-Terawatt power source. Space travel. Shit's hard.
- jerf 10y ago
  (Six hours later correction: I should have said when the fuel is not in the vehicle.)
jsprogrammer 10y ago
https://en.m.wikipedia.org/wiki/Electrodynamic_tether https://en.m.wikipedia.org/wiki/Electrodynamic_tether

zyxzevn 10y ago

Thanks. Looks like the wires create the push with magnetic fields.

rurban 10y ago

Cannot you write at least name right? The Austrian experimental physicist https://en.wikipedia.org/wiki/Martin_Tajmar https://en.wikipedia.org/wiki/Martin_Tajmar is a legend already, since he measured in 2002 a gravitomagnetic effect in spinning superconductors at Seibersdorf, but this sensational effect is also probably just bad experimental setup and not a new gravitational theory. He is the author of the classic book "Advanced Space Propulsion Systems".