EmDrive (Propelantless microwave resonant reactor by Roger Shawyer)
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EmDrive (Propelantless microwave resonant reactor by Roger Shawyer)
Just a tech-watch on a possible revolution with EmDrive (Propelantless microwave resonant reactor by Roger Shawyer). Not sure it works. Not sure it cannot work. Just watching. by AlainCo of http://www.lenr-forum.com , @alain_co https://twitter.com/alain_co
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EmDrive - FAQ

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FAQ

Theory

1. 
Q. Is the thrust produced by the EmDrive a reactionless force?
A. No, the thrust is the result of the reaction between the end plates of the waveguide and the Electromagnetic wave propagated within it.

2. 
Q. How can a net force be produced by a closed waveguide?
A. At the propagation velocities (greater than one tenth the speed of light) the effects of special relativity must be considered. Different reference planes have to be used for the EM wave and the waveguide itself. The thruster is therefore an open system and a net force can be produced.

3. 
Q. Why does the net force not get balanced out by the axial component of the sidewall force?
A. The net force is not balanced out by the axial component of the sidewall force because there is a highly non linear relationship between waveguide diameter and group velocity. (e.g. at cut off diameter, the group velocity is zero, the guide wavelength is infinity, but the diameter is clearly not zero.) The design of the cavity is such that the ratio of end wall forces is maximised, whilst the axial component of the sidewall force is reduced to a negligible value.

4.
Q. Does the theory of the EmDrive contravene the accepted laws of physics or electromagnetic theory?
A. The EmDrive does not violate any known law of physics. The basic laws that are applied in the theory of the EmDrive operation are as follows:

Newton’s laws are applied in the derivation of the basic static thrust equation (Equation 11 in the theory paper) and have also been demonstrated to apply to the EmDrive experimentally.

The law of conservation of momentum is the basis of Newtons laws and therefore applies to the EmDrive. It is satisfied both theoretically and experimentally.

The law of conservation of energy is the basis of the dynamic thrust equation which applies to the EmDrive under acceleration,(see Equation 16 in the theory paper).

The principles of electromagnetic theory are used to derive the basic design equations.

 

5. 
Q. Why does the EmDrive not contravene the conservation of momentum when it operates in free space?
A. The EmDrive cannot violate the conservation of momentum. The electromagnetic wave momentum is built up in the resonating cavity, and is transferred to the end walls upon reflection. The momentum gained by the EmDrive plus the momentum lost by the electromagnetic wave equals zero. The direction and acceleration that is measured, when the EmDrive is tested on a dynamic test rig, comply with Newtons laws and confirm that the law of conservation of momentum is satisfied.

6.
Q. Is the EmDrive a form of perpetual motion machine?
A. The EmDrive obeys the law of conservation of energy and is therefore not a perpetual motion machine. Energy must be expended to accelerate the EmDrive (see Equation 16 of the theory paper). Once the EmDrive is switched off, Newton’s laws ensure that motion is constant unless it is acted upon by another force.

7.
Q. Why does the thrust decrease as the spacecraft velocity along the thrust vector increases?
A. As the spacecraft accelerates along the thrust vector, energy is lost by the engine and gained as additional kinetic energy by the spacecraft. This energy can be defined as the thrust multiplied by the distance through which the thrust acts. For a given acceleration period, the higher the mean velocity, the longer the distance travelled, hence the higher the energy lost by the engine.
This loss of stored energy from the resonant cavity leads to a reduction in Q and hence a reduction of thrust.

Test procedures

8.
Q. Has buoyancy been allowed for?
A. Buoyancy has been allowed for in the initial experiments and then eliminated by hermetically sealing the thruster.

9.
Q. Are there any convection currents which might affect the results?
A. Convection currents did not affect the results, as measurements were taken with the thrust vector up, down and horizontal. Test runs were also carried out using a thermal simulation heater to quantify the effects of change of coolant temperature.

10.
Q. Has stiffness in cables and pipes been allowed for?
A. The only connections to the balance were high flex electrical links

11.
Q. Has friction in any pivots been allowed for?
A. Static thrust measurements were carried out using 3 different techniques – a counterbalance rig with a knife edge pivot, a direct weighing method using a 16kg balance (0.1 gm resolution), and with the thruster suspended from a spring balance with the weight partly offloaded on to an electronic balance.

12.
Q. Have electromagnetic effects been taken into account? These include interactions between current-carrying conductors and between such conductors carrying RF currents and nearby metallic structures in which currents might be induced.
A. Stray electromagnetic effects were eliminated by using different test rigs, by testing two thrusters with very different mounting structures, and by changing the orientation by 90 degrees to eliminate the Earth’s magnetic field.

13.
Q. Is there any ionization within the air, which might cause electrostatic charging and resulting forces?
A. Electrostatic charges were eliminated by the comprehensive earthing required for safety reasons, and to provide the return path for the magnetron anode current.

14.
Q. Could RF pick-up measurement circuits have produced erroneous results?
A. EMC tests were carried out on the instrumentation to eliminate the effects of RF pick up.

15.
Q. Could acceleration be caused by spurious torques generated by the air bearing?
A. Dynamic tests are preceded by an acceleration calibration test, using standard weights to determine the air bearing friction.

16.
Q. Could acceleration be caused by anomalous thermal or electromagnetic effects?
A. Acceleration and deceleration tests have been carried out in both clockwise and anti-clockwise directions Acceleration from rest only starts when the magnetron output frequency matches the resonant frequency of the engine, following an initial warm-up period.

Applications

17.
Q. Can the technology be qualified for space applications?
A. Yes, all the basic microwave, power supply, thermal and control technologies are similar to flight equipment currently used on high power communication satellites.

18.
Q. How can the EmDrive produce enough thrust for terrestrial applications?
A. The second generation engines will be capable of producing a specific thrust of 30kN/kW. Thus for 1 kilowatt (typical of the power in a microwave oven) a static thrust of 3 tonnes can be obtained, which is enough to support a large car. This is clearly adequate for terrestrial transport applications.
The static thrust/power ratio is calculated assuming a superconducting EmDrive with a Q of 5 x 109. This Q value is routinely achieved in superconducting cavities.
Note however, because the EmDrive obeys the law of conservation of energy, this thrust/power ratio rapidly decreases if the EmDrive is used to accelerate the vehicle along the thrust vector. (See Equation 16 of the theory paper). Whilst the EmDrive can provide lift to counter gravity, (and is therefore not losing kinetic energy), auxiliary propulsion is required to provide the kinetic energy to accelerate the vehicle.

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Alain Coetmeur's comment, August 24, 2013 7:38 AM
It seems hard to believe, but if they did as they say, it seems experimentally hard to criticize.
For theoretical reasons, they seems to have well studied (and have been criticized), and incredulity is probably based on misunderstanding of relativistic effects.
If EmDrive is erroneous, it is probably both a strange experimental artifact that survives many checking, and tricky detail in the computations, that were not noticed by critics.
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Whisper From the First Stars Sets Off Loud Dark Matter Debate | Quanta Magazine

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Physics from the edge: A paper on QI & cold fusion

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Leaked NASA papers prove ‘Impossible Fuel free Engine’, aka EmDrive WORKS

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According to the leaked NASA documents, the 'impossible' fuel-free engine that could take mankind to Mars in just 10 weeks WORKS. According to researchers, the revolutionary engine creates thrust by 'bouncing' microwaves in a closed chamber and is powered by solar energy. The possibility of a space engine that does not require fuel –it actually transforms electricity into impulse by moving microwaves inside an enclosed chamber - seems to be closer than ever thanks to leaked NASA documents. Not long ago, several independent laboratories concluded that somehow, the ‘impossible’ fuel-free engine called EmDrive that could transport astronauts to Mars in just 10 weeks works, even though no one known how or why it works. The revolutionary engine creates thrust by bouncing microwaves in a closed chamber and is powered by solar energy. The engine that has been dubbed as impossible since it defies everything we thought we knew about physics has created quite a buzz in the last couple of months.
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Expanding cosmos hints at new physics

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A discrepancy in measurements of the Universe's expansion rate has now become "pretty serious".
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How quantised inertia gets rid of dark matter -- Sott.net

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How Quantised Inertia Gets Rid Of Dark Matter

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World EM-Drive Team Crowd Fund

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Alain Coetmeur's insight:
Make your due diligence first, as usual!
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Emdrive, the motor impossible. Original article by Alessandro Brizzi. - Cognitio

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How quantised inertia gets rid of dark matter | Mike McCulloch | TEDxPlymouthUniversity - YouTube

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Trajectoires des sondes spatiales : de nouvelle anomalies - Science & Vie

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Après les sondes Pioneer qui ralentissaient, c'est au tour de Juno, Galileo, Near, Cassini et Rosetta d'accélérer de manière étrange... les scientifiques ont-ils trouvé l'explication ?
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EmDrive Presentation by Roger Shawyer Part 1 of 3. The future of spacetravel. - YouTube

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EmDrive : le propulseur de l’espace qui défie les lois de la physique fonctionne dans le vide

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Il faut croire que votre Guru perd la tête, mais il était sûr d’avoir évoqué dans un précèdent article le propulseur qui défient les lois de la physique, q
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The SpaceDrive Project – Developing Revolutionary Propulsion at TU Dresden

Propellantless propulsion is believed to be the best option for interstellar travel. However, photon rockets or solar sails have thrusts so low that maybe only nano-scaled spacecraft may reach the next star within our lifetime using very high-power laser beams. Since 2012, a dedicated breakthrough propulsion physics group was founded at the Institute of Aerospace Engineering at TU Dresden to investigate different concepts based on non-classical/revolutionary propulsion ideas that claim to be at least an order of magnitude more efficient in producing thrust compared to photon rockets. Most of these schemes rely on modifying the inertial mass, which in turn could lead to a new propellantless propulsion method. Our intention is to develop an excellent research infrastructure to test new ideas and measure thrusts and/or artefacts with high confidence to determine if a concept works and if it does how to scale it up. At present, we are focusing on two possible revolutionary concepts: The EMDrive and the Mach-Effect Thruster. The first concept uses microwaves in a truncated cone-shaped cavity that is claimed to produce thrust. Although it is not clear on which theoretical basis this can work, several experimental tests have been reported in the literature, which warrants a closer examination. We are building several models of different sizes to understand scaling laws and the interaction with the test environment. The second concept is theoretically much better understood and is believed to generate mass fluctuations in a piezo-crystal stack that creates non-zero time-averaged thrusts. Apart from theoretical models, we are testing and building several such thrusters in novel setups to further investigate their thrust capability. In addition, we are performing side-experiments to investigate other experimental areas that may be promising for revolutionary propulsion. To improve our testing capabilities, several cutting-edge thrust balances are under development to compare thrust measurements in different measurement setups to gain confidence and to identify experimental artefacts
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How QI gets rid of dark matter

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Assessing the EM-Drive claims

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Crowdfunding: World Em-Drive Team - EmDrive Forum

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I just found this website proposing a crowdfunding of EmDrive research
emdriveteam.com/

It looks enthusiastic and human sized, with a californian address, and a yet to come address in Las Vegas...

As Usual before puting money, even love money, it is…
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