Generic EM Drive Information

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

Conservation of Energy Violation

Doctor White has proposed that the EM Drive is capable of producing constant thrust at a constant power output. User frobnicat has shown (in the following image) that if this were to be true, then the EM Drive could be utilized as a source of unlimited energy. <ref>frobnicat on using the EM Drive for unlimited energy.</ref> This of course constitutes a violation of Conservation of Energy.

<img src="http://forum.nasaspaceflight.com/index.php?action=dlattach;topic=29276.0;attach=619549;image" style="width:20%">

On the assumption that the results provided by the various experimenting groups are valid, then one of the following two options as provided by user deltamass<ref>detlamass on the Energy Paradox.</ref> and clarified by user frobnicat <ref>frobnicat on apparent/non-apparent CoE breakage.</ref> must be true. The options are as follows:

Option 1: Energy is conserved, but there is a preferred rest frame. In essence, the drive has a maximum change in velocity (a decreasing acceleration curve) that it can impart irrespective of its starting velocity. The idea of a preferred rest frame is at odds with general relativity.

Option 2: An apparent breach of conservation of energy is possible, where the mechanism by which conservation of energy is maintained is as yet unknown. An example of a possible solution to this problem is that the drive could in some way be emitting tachyons.<ref>frobnicat on tachyons.</ref>

Mode Shape

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

The mode-shape to frequency relation is very sensitive to the exact geometrical dimensions of the cavity. <ref>Rodal's post on geometric relations to mode shape.</ref>

References

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