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Like the EM drive, https://thedebrief.org/nasa-veterans-propellantless-propulsion-drive-that-physics-says-shouldnt-work-just-produced-enough-thrust-to-defeat-earths-gravity/this one uses a capacitor. Instead of piezo (not that a piezo is not a capacitor) , but it sounds similar. That is that there is some unequal force in a polarizing material which leads to thrust. Not a (weak) photon drive.