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For it to be magnetohydrodynamics, we'd be introducing an electric potential, to accelerate the air itself to create jet thrust. I can't imagine that the mechanical efficiency could exceed that of an electric traction motor. It's a second law of thermodynamics fail.
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That's exactly how plasma actuators do.
The efficiency (and the dust-collecting aspect) is made available for A-B testing and verification with the Subaru part (plus a signal generator).