Talk-Polywell.org

https://phys.org/news/2021-04-comprehen ... drive.html

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The results of the Eagleworks experiment were not very strong. While the team claimed to measure a thrust, it wasn't statistically significant, and appeared to be a result of "cherry-picking"—the authors watching random fluctuations and waiting for the right time to report their results.

But in the spirit of scientific replication, a team at the Dresden University of Technology led by Prof. Martin Tajmar rebuilt the Eagleworks experimental setup.

And they found squat.

Reporting their results in the Proceedings of Space Propulsion Conference 2020, Prof. Tajmar said, "We found out that the cause of the 'thrust' was a thermal effect. For our tests, we used NASAs EmDrive configuration from White et al. (which was used at the Eagleworks laboratories, because it is best documented and the results were published in the Journal of Propulsion and Power.)

With the aid of a new measuring scale structure and different suspension points of the same engine, we were able to reproduce apparent thrust forces similar to those measured by the NASA team, but also to make them disappear by means of a point suspension."

In essence, the Eagleworks EmDrive apparent thrust came from a heating of the scale they used to measure the thrust, not from any movement of the drive itself.

"When power flows into the EmDrive, the engine warms up. This also causes the fastening elements on the scale to warp, causing the scale to move to a new zero point. We were able to prevent that in an improved structure," Prof. Tajmar continued.

His conclusion puts the final nail in the coffin for EmDrive dreams: "Our measurements refute all EmDrive claims by at least three orders of magnitude."