EmDrive

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EmDrive in the test chamber

The form of a hypothetical microwave drive , which was developed by the Briton Roger Shawyer, a former project manager of the space company Astrium , is called EmDrive (from English electromagnetic drive : Electromagnetic drive) . Its function has not yet been proven and, according to the current state of knowledge, would violate the physical law of conservation of momentum.

Experimental evidence

Some studies seem to support the functioning of the drive, for example by Yang Juan at the Polytechnic University of Northwest China and, in a modification ("Cannae drive"), by NASA . In November 2016, the NASA-JSC published a publication which indicates the functionality of the drive.

After the researchers had recognized and eliminated some possible sources of error in the original test setup, they determined in a control experiment on a torsion balance that a horizontal thrust comparable to the previous experiments could also be measured with a vertically directed engine . This result indicates that previously undetected measurement errors or external influences are responsible for the positive measurement results.

Critics consider the results to be artifacts of the measurements, since they violate Newton's third law and the law of conservation of momentum. Some scientists consider the balance-wheel effect to be the trigger for the measured thrust phenomenon. Other researchers see the unproven Mach / Woodward effect as the trigger.

In 2018, a team led by Martin Tajmar at the Technical University of Dresden also carried out a series of experiments on EmDrive. The results of the measurements were published in 2019 and could neither prove nor disprove functionality as a drive.

Web links

See also

Individual evidence

  1. ↑ Revolutionary rocket propulsion: thrust without fuel. In: Spiegel Online . August 6, 2014, accessed May 25, 2016 .
  2. ↑ No-propellant drive prepares for space and beyond eurekamagazine.co.uk
  3. ↑ Paul Friedlander: EmDrive on trial. Retrieved June 5, 2019 (American English).
  4. ↑ Juan Yang, Yu-Quan Wang, Yan-Jie Ma, Peng-Fei Li, Le Yang, Yang Wang, Guo-Qiang He: Prediction and experimental measurement of the electromagnetic thrust generated by a microwave thruster system . In: Chinese Physics B . tape 22 , no. 5 , May 1, 2013, doi : 10.1088 / 1674-1056 / 22/5/050301 .
  5. ↑ Nasa validates 'impossible' space drive (Wired UK). In: WiredUK. Retrieved May 25, 2016 .
  6. ↑ Harold White, Paul March, James Lawrence, Jerry Vera, Andre Sylvester, David Brady, Paul Bailey: Measurement of Impulsive Thrust from a Closed Radio-Frequency Cavity in Vacuum . In: Journal of Propulsion and Power . November 17, 2016, p. 1-12 , doi : 10.2514 / 1.B36120 .
  7. ↑ M. Tajmar , G. Fiedler: Direct Thrust Measurements of an EM Drive and Evaluation of Possible Side-Effects. Retrieved July 5, 2016 .
  8. ↑ New paper claims that the EM Drive doesn't defy Newton's 3rd law after all sciencealert.com
  9. ↑ No, German Scientists Have Not Confirmed the “Impossible” EMDrive gizmodo.com, accessed on June 27, 2016
  10. ↑ The Power Of The Force; The Curious Case Of The EmDrive forbes.com, accessed on November 3, 2017
  11. ↑ The Theoretical Model For This Impossible Space Drive Doesn't Prove Anything forbes.com, accessed June 4, 2016
  12. ^ The Curious Link Between the Fly-By Anomaly and the "Impossible" EmDrive Thruster technologyreview.com
  13. ↑ The impossible 'EmDrive Thruster has cleared its first credibility hurdle astronomy.com, accessed on November 23, 2016
  14. ^ Daniel Oberhaus: A Mythical Form of Space Propulsion Finally Gets a Real Test. In: Wired. June 5, 2019, accessed June 5, 2019 .
  15. ↑ doi : 10.1016 / j.actaastro.2019.05.020