Difference between revisions of "Generic EM Drive Information"
(Removed the velocity and kinetic energy sections as a result of a conversation with Doctor Rodal about how to handle the corrections provided by later efforts in the forum.) |
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== Conservation of Energy Violation == | == 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>[http://forum.nasaspaceflight.com/index.php?topic=37438.msg1369806#msg1369806 frobnicat on using the EM Drive for unlimited energy.]</ref> This of course constitutes a violation of [http://en.wikipedia.org/wiki/Conservation_of_energy Conservation of Energy.] | + | 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 text and image) that if this were to be true, then the EM Drive could be utilized as a source of unlimited energy. <ref>[http://forum.nasaspaceflight.com/index.php?topic=37438.msg1369806#msg1369806 frobnicat on using the EM Drive for unlimited energy.]</ref> This of course constitutes a violation of [http://en.wikipedia.org/wiki/Conservation_of_energy Conservation of Energy.] |
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| + | "As often remarked : for any propellantless device yielding "given constant thrust for given constant power" (ie. a definite thrust/power ratio) there is a velocity relative to a power feedback loop system above which net power surplus can be generated (indefinitely, wear apart). | ||
| + | This velocity is simply the inverse of the thrust/power ratio : V (m/s) = power (W) / thrust (N)." -frobnicat <ref>[http://forum.nasaspaceflight.com/index.php?topic=37438.msg1370818#msg1370818 frobnicat explains constant thrust/power feedback loop]</ref> | ||
<img src="http://forum.nasaspaceflight.com/index.php?action=dlattach;topic=29276.0;attach=619549;image" style="width:20%"> | <img src="http://forum.nasaspaceflight.com/index.php?action=dlattach;topic=29276.0;attach=619549;image" style="width:20%"> | ||
Revision as of 08:05, 19 May 2015
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 text and image) that if this were to be true, then the EM Drive could be utilized as a source of unlimited energy. [1] This of course constitutes a violation of Conservation of Energy.
"As often remarked : for any propellantless device yielding "given constant thrust for given constant power" (ie. a definite thrust/power ratio) there is a velocity relative to a power feedback loop system above which net power surplus can be generated (indefinitely, wear apart). This velocity is simply the inverse of the thrust/power ratio : V (m/s) = power (W) / thrust (N)." -frobnicat [2]
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[3] and clarified by user frobnicat [4] 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.[5]
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. [6]
