- There is no reason to expect that it "works". Shawyer's original "theory" on which the design is based is wrong, the EW do not even mention it in the paper.

- Two other groups attempted to measure a similar device and published results. TU Dresden [1] people failed to get a signal, and the Chinese NWPU people reported failure (in the 2016 update [2], after debugging the first measurement). Both are consistent with null hypothesis that there's nothing to see here.

- Bringing up "quantum vacuum plasma" and Bohmian theory, but failing to give a working argument why they would explain anything in the experiment, or even be relevant for it. The likely reason for the failure to produce something intelligible likely is that quantum vacuum does not help here --- it's a well-understood concept (perhaps not to EW), as is momentum conservation.

[1] http://dx.doi.org/10.2514/6.2015-4083 [2] http://dx.doi.org/10.13675/j.cnki.tjjs.2016.02.022