In previous work I've offered an explanation for emdrive in terms of MiHsC operating on the light within the emdrive cavity (see McCulloch, 2015), and I have not abandoned this approach, but in the past couple of days I've wondered whether I can do it, probably with the same maths, by looking at the cavity instead and forgetting about the light, except as a source of vibration. This schematic shows what I have been considering.

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