Generic EM Drive Information

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This is a location for assorted information concerning EM Drives. Likely applies to all current experimental efforts.

Conservation of Energy Discussion

See Energy Conservation.

Mode Shape

See calculations pertaining to the relationship between thrust and mode shape at Notsosureofit's post and Rodal's response.

An EM Drive is a cavity resonator that uses the Quality Factor Q to achieve greater response. There is definitely a peak resonant frequency to achieve the highest Q, though besides Q and frequency, mode shape must also be considered. The shape of the electric and magnetic fields inside the cavity at a given frequency.[1]

The mode-shape to frequency relation is very sensitive to the exact dimensions of the cavity. [2] A dielectric insert lowers the natural frequency at which a given mode shape takes place.[3] Here is a plot of what a few mode shapes in a cylindrical cavity look like when viewed perpendicular to the circular cross section plane.

References