Prediction and experimental measurement of the electromagnetic thrust generated by a microwave thruster system

Yang, Juan; Yu-quan, Wang; Ma, Yanjie; Li, Pengfei; Lei, Yang; Wang, Yang; He, Guoqiang

doi:10.1088/1674-1056/22/5/050301

Cited by 16 publications

(12 citation statements)

References 17 publications

(18 reference statements)

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“…The theory was applied in cosmological [4] and galactic [5] contexts, and in [3] it was used to explain the discordant measurements of Newton gravitational constant as due to the effect of the earth's magnetic field. In [1] it was further shown that a ST theory of the MLR type could explain the unusual forces on asymmetric resonant cavities reported at that time [6]. However, in the derivation of the equations from the action principle some inconsistencies were observed, and also the forces obtained, after reconsideration of the experiments originally reported and new results [2], were too high.…”

Section: Introductionmentioning

confidence: 91%

Revaluation of Mbelek and Lachièze-Rey scalar-tensor theory of gravitation to explain the measured forces in asymmetric resonant cavities

Minotti¹

2017

Gravit. Cosmol.

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Abstract. The scalar-tensor theory of gravitation proposed by Mbelek and Lachiè ze-Rey has been shown to lead to a possible explanation of the forces measured in asymmetric resonant microwave cavities [1]. However, in the derivation of the equations from the action principle some inconsistencies were observed, like the need no to vary the electromagnetic invariant in a scalar source term. Also, the forces obtained were too high, in view of reconsideration of the experiments originally reported and of newly published results [2]. In the present work the equations are re-derived using the full variation of the action, and also the constant of the theory re-evaluated employing the condition that no anomalous gravitational effects are produced by the earth's magnetic field. It is shown that the equations originally employed were correct, and that the newly evaluated constant gives the correct magnitude for the forces recently reported

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Section: Introductionmentioning

confidence: 91%

Revaluation of Mbelek and Lachièze-Rey scalar-tensor theory of gravitation to explain the measured forces in asymmetric resonant cavities

Minotti¹

2017

Gravit. Cosmol.

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“…Independent tests were carried out in China by Yang et al [10][11][12] who tested the EMDrive on a force-feedback thrust stand and achieved up to 720 mN of thrust with 1000 W microwave power with even higher Q factors compared to Shawyer. Most recently, Brady et al 13 tested the concept on a torsion balance at NASA with a µN resolution obtaining thrusts of 50 µN using only 20 W of RF power.…”

Section: Figure 1 Emdrive Conceptmentioning

confidence: 99%

Direct Thrust Measurements of an EMDrive and Evaluation of Possible Side-Effects

Fiedler¹

2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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The EMDrive has been proposed as a revolutionary propellantless thruster using a resonating microwave cavity. It is claimed to work on the difference in radiation pressure due to the geometry of its tapered resonance cavity. We attempted to replicate an EM Drive and tested it on both a knife-edge balance as well as on a torsion balance inside a vacuum chamber. After developing a numerical model to properly design our cavity for high efficiencies in close cooperation with the EM Drive's inventor, we built a breadboard out of copper with the possibility to tune the resonance frequency in order to match the resonance frequency of the magnetron which was attached on the side of the cavity. After measuring the Q-factor of our assembly, we connected the EMDrive to a commercial 700 W microwave magnetron. After a thermal mapping of the surfaces, we performed thrust measurements with a knife-edge balance as well as with a torsion balance in vacuum chamber. Our measurements reveal thrusts as expected from previous claims after carefully studying thermal and electromagnetic interferences. For the first time, measurements were also performed in high vacuum. Due to a low Q factor of <50, we observed thrusts of +/-20 µN. We identified the magnetic interaction of the power feeding lines going to and from the liquid metal contacts as the most important possible side-effect that is not fully characterized yet. Our test campaign can not confirm or refute the claims of the EMDrive but intends to independently assess possible side-effects in the measurements methods used so far. Nevertheless, we do observe thrusts close to the actual predictions after eliminating many possible error sources that should warrant further investigation into the phenomena. Nomenclature c = speed of light = 3×10 8 m/s f = frequency F = force P = power

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“…Their experimental results, first reported in 2010, give a maximum force of 720 mN for an input microwave power of 2.5 kW. The force was measured on a pendulum test rig and the direction confirmed that it was the reaction force being measured, rather than the net force due to the difference in reflection forces at each end plate [2]. This is further confirmation that EmDrive is operating as a Newtonian machine, with a thrust generated in one direction and a reaction force in the opposite direction.…”

Section: Introductionmentioning

confidence: 74%

Second generation EmDrive propulsion applied to SSTO launcher and interstellar probe

Shawyer

2015

Acta Astronautica

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Prediction and experimental measurement of the electromagnetic thrust generated by a microwave thruster system

Cited by 16 publications

References 17 publications

Revaluation of Mbelek and Lachièze-Rey scalar-tensor theory of gravitation to explain the measured forces in asymmetric resonant cavities

Revaluation of Mbelek and Lachièze-Rey scalar-tensor theory of gravitation to explain the measured forces in asymmetric resonant cavities

Direct Thrust Measurements of an EMDrive and Evaluation of Possible Side-Effects

Second generation EmDrive propulsion applied to SSTO launcher and interstellar probe

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