Scientists Develop Plasma Thruster That Could One Day Power Planes
bloomberg.com
bloomberg.com
Publication: https://doi.org/10.1063/5.0005814
Doing a quick scan of the group's AIP paper, I'm generally okay with the methodology and the results they've drawn from it. It seems like their results are mostly establishing a rough thrust value with a force ceiling on each measurement, not a high-precision continuous dataset. Assuming the quartz tube and sphere don't seriously deviate from one another, the equations and physical assumptions they're using check out fine. It's not something you'd want to doing a full characterization on a flight model or anything, but for lab-scale experiment, I think it works.
Not sure if this is helpful, but based on the video I'd guess that rattling only occurs in the plasma regime (as opposed to the normal, standard temp airflow), at which point I'm don't think the physical basis of the Reynold's number holds. Plasmas, especially under an external magnetic field, are only quasi-stable and so their bulk behaviours don't necessarily track with those of classical fluids.