[mleonhard]

A 2013 paper by Fearn & Woodward makes no mention of the earth's magnetic field. After skimming the paper, I think their experiment is flawed.

"Experimental Null Test of a Mach Effect Thruster." https://arxiv.org/pdf/1301.6178.pdf

"The motion of the beam is damped by a pair of aluminum plates attached to the beam that move in the magnetic field of an array of small neodymium-boron magnets. The power circuit was extensively shielded to insure that stray fields did not compromise the results."