which is why I replied to Paul on the issue of power source when he mentioned LERN. the issue didnīt really started as a discussing about whatīs the best power source... I donīt really care what will the power source, nor am I interested in discussing here which power producing method has the most potential, whatever.the issue I had here was how the scientific community looks at the EM Drive and the Eagleworks Lab experiments,which ARE fringe, and how will they look at what is already considered fringe physics if powerpoint presentations include LERN stuff...Am I that wrong in those fears?
Quote from: Star One on 04/06/2015 09:37 pmOne thing that has mystified me about this whole business is it not the fact that this effect has been known about for a number of years so why is it only in recent years that people have started looking into it?It's not clear, what effect are you referring to?
One thing that has mystified me about this whole business is it not the fact that this effect has been known about for a number of years so why is it only in recent years that people have started looking into it?
Microwave communications on satellites wasn't it first noted.
Quote from: Abyss on 04/06/2015 09:46 pmQuote from: Star One on 04/06/2015 09:37 pmOne thing that has mystified me about this whole business is it not the fact that this effect has been known about for a number of years so why is it only in recent years that people have started looking into it?It's not clear, what effect are you referring to?Microwave communications on satellites wasn't it first noted.
QuoteMicrowave communications on satellites wasn't it first noted.From what I've read, yes.Shawyer was investigating why certain satellites were burning through their fuel far faster than expected. He concluded that microwave emissions from devices on board these satellites was responsible, and from there began looking into this as a means of thrust.
Quote from: aceshigh on 04/06/2015 10:47 pmwhich is why I replied to Paul on the issue of power source when he mentioned LERN. the issue didnīt really started as a discussing about whatīs the best power source... I donīt really care what will the power source, nor am I interested in discussing here which power producing method has the most potential, whatever.the issue I had here was how the scientific community looks at the EM Drive and the Eagleworks Lab experiments,which ARE fringe, and how will they look at what is already considered fringe physics if powerpoint presentations include LERN stuff...Am I that wrong in those fears?IMHO, no, you are right. When trying to defend yourself and your ideas from strong criticism, don't become an even bigger target. Not even by making the innocent mistake of passingly referencing another controversial topic in your slides.Focus on the pill you want your public to swallow. And not on any other.
I reject the idea that we should stay silent and not mention certain words or areas of research to avoid offending the sensibilities of certain individuals. ...The safer and more astute approach is to maintain a skeptical but open mind until the evidence bears it out or proves it wrong. And in the meanwhile, fear, uncertainty, and doubt of discussing LENR and its possible implications for the EM Drive should be replaced with skepticism, open-mindedness, and a willingness to role up the sleeves and try things.
The microwave communications are possible because microwaves are transmitted from (and to) the satellite. The microwaves obviously are leaving (or entering) the satellite. If there is any propulsion resulting from communications from the satellite, it may not violate the laws of conservation of momentum and conservation of energy, because the microwave photons are leaving the sateliite. It would work like a photon rocket for microwaves leaving the satellite (or like a solar sail for microwave photons hitting the satellite). Scientists have no problems with the concept of a photon rocket (except that it is one the least useful forms of space propulsion: one can also use a military searchlight as a photon rocket).Shawyer's EM Drive is completely different: it is a completely enclosed cavity. The microwaves inside it are standing waves. No microwaves leave the EM Drive. No photons leave the EM Drive (certainly not on purpose). That's why scientists think that the EM Drive should not be able to have any propulsion: because it appears to violate conservation of momentum. The standing microwaves inside an EM Drive cannot be used for communication purposes because they stay inside the EM Drive: the metal acts like a Faraday cage.So what is mystifying, if indeed Shaywer was inspired by this issue, is whether Shawyer did not understand the difference between a completely enclosed microwave cavity and a communications satellite transmitting microwaves or whether the story that he was inspired by this is not really accurate.It would be like somebody saying that they invented a new form of space propulsion based on a flashlight inside a a completely sealed box with mirrors on every inside surface, and claiming that they were inspired by noticing that a satellite in space flashing a light for communications purposes, also acts like a photon rocket. Yes, a flashlight in space will act like a photon rocket, but if you put the flaslight inside a sealed box so that no light leaves the box, it is just a box sitting in space: it is no longer good for communications and it is no longer good for propulsion
Quote from: Star One on 04/06/2015 06:55 pmQuote from: tchernik on 04/06/2015 06:04 pmQuote from: birchoff on 04/06/2015 04:59 pmDoes anyone actually believe that if we had a working EmDrive with the predicted thrust capabilities that we would have a problem finding power for it? ....So from where I am standing, power will not be an issue if the EmDrive is proven to deliver usable thrust. We as a species will find a way.I fully agree. Fretting about the energy source is a bit too much at this stage, when conclusively proving the existence of the phenomenon has yet to happen.If this becomes a proven scientific fact, with a few more conclusive replications, finding a power source for it is just an engineering problem. That is, one based on the application of already known scientific and technical principles. We know nukes work and we have them, we know fuel cells work and we have them, the same as solar photovoltaics, etc. Gee, if Emdrives are proven to work as H. White and Paul M. expect, we would be soon putting gasoil engines/generators to power them, and this for replacing turbofans/propellers for flying in the low atmosphere!I believe because of their extremely contentious nature & reputation to the majority in the scientific community it's not just a case of showing EM drives work but producing a rock solid case for why they work. Unfortunately there has been so many other claims of a similar nature that have been made over the years that have proved to be nonsense that it has severely muddied the waters leaving things such as the EM drive with incredibly high hurdles to clear before anyone gives them the time of day.which is why I replied to Paul on the issue of power source when he mentioned LERN. the issue didnīt really started as a discussing about whatīs the best power source... I donīt really care what will the power source, nor am I interested in discussing here which power producing method has the most potential, whatever.the issue I had here was how the scientific community looks at the EM Drive and the Eagleworks Lab experiments,which ARE fringe, and how will they look at what is already considered fringe physics if powerpoint presentations include LERN stuff...Am I that wrong in those fears?Quote from: birchoff on 04/06/2015 08:37 pmGiven the figures the predicted thrust that paul march provided us. Anyone mind educating this lay person on how a single EmDrive thruster would perform vs our current rockets.well, itīs about 1250 kN is about two times the thrust of a Merlin 1D engine from the Falcon 9...he also mentioned 1 million of ISP... I guess thatīs like having the power of a Merlin 1D engine consuming the same fuel per second as an electric bycicle??I GUESS a single one would be enough to counter gravity and take a Falcon 9 rocket to space. However, because of the Falcon 9 weight and the thrust equivalent of only 2 merlin engines, it would probably take longer to get to orbit (which as you know is a matter of speed, not height).But considering the ISP of 1 million (so little fuel being consumed per second) it HAS THE TIME to accelerate to orbital speed in the vacuum, while a normal rocket doesnīt have it (fuel ends fast, if it hasnt reached orbital speed, it falls).I guess you could use it at like 45 degrees angle... half of thrust to keep it in space vacuum while the other half is horizontal speed to gather orbital speed?Once in orbit... a single motor with 1250 N of thrust and 1 million of ISP can do wonders. Anyone wants to calculate the acceleration possible with such motor and a ship the weight of a fully loaded Falcon 9? (after all, he asked how it compared to current rockets)
Quote from: tchernik on 04/06/2015 06:04 pmQuote from: birchoff on 04/06/2015 04:59 pmDoes anyone actually believe that if we had a working EmDrive with the predicted thrust capabilities that we would have a problem finding power for it? ....So from where I am standing, power will not be an issue if the EmDrive is proven to deliver usable thrust. We as a species will find a way.I fully agree. Fretting about the energy source is a bit too much at this stage, when conclusively proving the existence of the phenomenon has yet to happen.If this becomes a proven scientific fact, with a few more conclusive replications, finding a power source for it is just an engineering problem. That is, one based on the application of already known scientific and technical principles. We know nukes work and we have them, we know fuel cells work and we have them, the same as solar photovoltaics, etc. Gee, if Emdrives are proven to work as H. White and Paul M. expect, we would be soon putting gasoil engines/generators to power them, and this for replacing turbofans/propellers for flying in the low atmosphere!I believe because of their extremely contentious nature & reputation to the majority in the scientific community it's not just a case of showing EM drives work but producing a rock solid case for why they work. Unfortunately there has been so many other claims of a similar nature that have been made over the years that have proved to be nonsense that it has severely muddied the waters leaving things such as the EM drive with incredibly high hurdles to clear before anyone gives them the time of day.
Quote from: birchoff on 04/06/2015 04:59 pmDoes anyone actually believe that if we had a working EmDrive with the predicted thrust capabilities that we would have a problem finding power for it? ....So from where I am standing, power will not be an issue if the EmDrive is proven to deliver usable thrust. We as a species will find a way.I fully agree. Fretting about the energy source is a bit too much at this stage, when conclusively proving the existence of the phenomenon has yet to happen.If this becomes a proven scientific fact, with a few more conclusive replications, finding a power source for it is just an engineering problem. That is, one based on the application of already known scientific and technical principles. We know nukes work and we have them, we know fuel cells work and we have them, the same as solar photovoltaics, etc. Gee, if Emdrives are proven to work as H. White and Paul M. expect, we would be soon putting gasoil engines/generators to power them, and this for replacing turbofans/propellers for flying in the low atmosphere!
Does anyone actually believe that if we had a working EmDrive with the predicted thrust capabilities that we would have a problem finding power for it? ....So from where I am standing, power will not be an issue if the EmDrive is proven to deliver usable thrust. We as a species will find a way.
Given the figures the predicted thrust that paul march provided us. Anyone mind educating this lay person on how a single EmDrive thruster would perform vs our current rockets.
Let's not get carried away here! Our COMSOL/Q-V plasma code simulation indicated ~1,250 Newton for 100kW RF input using a water cooled version of our current copper cavity, NOT 1,250 kN, which is three orders of magnitude larger than stated in my previous post. I'm still trying to wrap my head around this 1,250 to 2,000 Newton figure...
Aces-high:"well, itīs about 1250 kN is about two times the thrust of a Merlin 1D engine from the Falcon 9..."Let's not get carried away here! Our COMSOL/Q-V plasma code simulation indicated ~1,250 Newton for 100kW RF input using a water cooled version of our current copper cavity, NOT 1,250 kN, which is three orders of magnitude larger than stated in my previous post. I'm still trying to wrap my head around this 1,250 to 2,000 Newton figure...Best, Paul M.
The problem is not the sensibilities of people.
Quote from: mlindner on 04/04/2015 07:38 amQuote from: Mulletron on 04/04/2015 02:01 amQuote from: mlindner on 04/04/2015 01:08 amIt appears my previous post got deleted.So I'll ask again. Has this psudoscience nonsense been found to be false yet? Have any proper scientists tested this contraption so that they can show that it doesn't work?I'm sure some "proper scientists" will come round for a look eventually. In the meantime, history has a lot to teach us about these sorts of things:http://amasci.com/weird/vindac.htmlhttp://www.lifehack.org/articles/lifestyle/6-world-changing-ideas-that-were-originally-rejected.htmlhttp://www.cracked.com/article_18822_5-famous-scientists-dismissed-as-morons-in-their-time.htmlEvery previous world changing idea didn't try to violate a founding principal of all physics, namely CoE and CoM.QuoteQuote...so that they can show that it doesn't workJust curious, what makes you so certain that it doesn't work? I mean, I have no idea if it works or not. The only certain thing I know here is that I don't know for certain if it works or doesn't.There is a growing body of evidence which suggest that it does work. It hasn't been proven by anybody that it doesn't work.I'm still waiting for an actual test of the operation of this craft. There haven't been any non-faulty experiments done yet that actually show it producing any thrust. Namely it must be tested in a vacuum. I don't try to merge philosophy and science and currently this "EM Drive" is purely in the realm of philosophy with no actual data yet. Thus I dismiss it just like the people claiming they made an anti-gravity drive in their garage.It's rather insulting that this forum topic even exists here.Well I can't fault you for being skeptical, but I do urge you to review the pages of this thread. Things start getting rather interesting around page 20 or so. Many of your concerns have been addressed here, such as the vacuum testing, which has been completed with data provided, and reported here by an engineer at Eagleworks. http://forum.nasaspaceflight.com/index.php?topic=36313.msg1326608#msg1326608Also interesting:http://forum.nasaspaceflight.com/index.php?topic=36313.msg1333835#msg1333835And, in my humble opinion, there has been plenty of existing, published in reputable journals...science uncovered, which can shed light on how the EMdrive can thrust, without violating any conservation laws.http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330846#msg1330846http://forum.nasaspaceflight.com/index.php?topic=36313.msg1333392#msg1333392Also @Notsosureofit has developed his own very plausible ideas about how EMdrive can thrust, using good old established science. @Rodal, @Aero, and @Frobnicat have all provided exhaustive data and calculations both for and against the reports of measured thrust at Eagleworks and NWPU China.We're openly hostile to pseudoscience here, but at the same time, we must be mindful that in order to get to the bottom of this mystery, we have to be willing to step outside of our comfort zones.From a practical standpoint, I find it extremely unlikely that the only means mankind will ever have to propel spacecraft through the vacuum, is to carry along stores of fuel and shoot propellant out the back side.If EMdrives aren't the answer, the lessons learned from this may lead to the answer. Once field propulsion is a reality, we can consider the solar system to be unlocked.Now that is worth a look.
Quote from: Mulletron on 04/04/2015 02:01 amQuote from: mlindner on 04/04/2015 01:08 amIt appears my previous post got deleted.So I'll ask again. Has this psudoscience nonsense been found to be false yet? Have any proper scientists tested this contraption so that they can show that it doesn't work?I'm sure some "proper scientists" will come round for a look eventually. In the meantime, history has a lot to teach us about these sorts of things:http://amasci.com/weird/vindac.htmlhttp://www.lifehack.org/articles/lifestyle/6-world-changing-ideas-that-were-originally-rejected.htmlhttp://www.cracked.com/article_18822_5-famous-scientists-dismissed-as-morons-in-their-time.htmlEvery previous world changing idea didn't try to violate a founding principal of all physics, namely CoE and CoM.QuoteQuote...so that they can show that it doesn't workJust curious, what makes you so certain that it doesn't work? I mean, I have no idea if it works or not. The only certain thing I know here is that I don't know for certain if it works or doesn't.There is a growing body of evidence which suggest that it does work. It hasn't been proven by anybody that it doesn't work.I'm still waiting for an actual test of the operation of this craft. There haven't been any non-faulty experiments done yet that actually show it producing any thrust. Namely it must be tested in a vacuum. I don't try to merge philosophy and science and currently this "EM Drive" is purely in the realm of philosophy with no actual data yet. Thus I dismiss it just like the people claiming they made an anti-gravity drive in their garage.It's rather insulting that this forum topic even exists here.
Quote from: mlindner on 04/04/2015 01:08 amIt appears my previous post got deleted.So I'll ask again. Has this psudoscience nonsense been found to be false yet? Have any proper scientists tested this contraption so that they can show that it doesn't work?I'm sure some "proper scientists" will come round for a look eventually. In the meantime, history has a lot to teach us about these sorts of things:http://amasci.com/weird/vindac.htmlhttp://www.lifehack.org/articles/lifestyle/6-world-changing-ideas-that-were-originally-rejected.htmlhttp://www.cracked.com/article_18822_5-famous-scientists-dismissed-as-morons-in-their-time.html
It appears my previous post got deleted.So I'll ask again. Has this psudoscience nonsense been found to be false yet? Have any proper scientists tested this contraption so that they can show that it doesn't work?
Quote...so that they can show that it doesn't workJust curious, what makes you so certain that it doesn't work? I mean, I have no idea if it works or not. The only certain thing I know here is that I don't know for certain if it works or doesn't.There is a growing body of evidence which suggest that it does work. It hasn't been proven by anybody that it doesn't work.
...so that they can show that it doesn't work
While that's all very interesting. You can immediately rule out the drive's functionality because of the lack of reaction mass. CoM is clearly broken.I only have a minor in physics so I honestly can't understand most of what's talked about here, but I know at the least you can't go about thrusting around the universe with no particles/energy leaving the engine without something like an Alcubierre drive. Even if you're pushing against quantum virtual particle pairs, virtual particle pairs have opposite signs so will be propelled in opposite directions thus canceling out any net force.I have yet to year a simple explanation of how this drive works that doesn't dive into theoretical physics to explain its operation. It is true of everything in physics that simple laws lead to complex behavior. If the operation of the EmDrive or other various families of the drive cannot be explained in an abstract way within a couple sentences then it doesn't work.People are being sold snake oil and I don't like it.
Quote from: mlindner on 04/07/2015 08:48 amWhile that's all very interesting. You can immediately rule out the drive's functionality because of the lack of reaction mass. CoM is clearly broken.I only have a minor in physics so I honestly can't understand most of what's talked about here, but I know at the least you can't go about thrusting around the universe with no particles/energy leaving the engine without something like an Alcubierre drive. Even if you're pushing against quantum virtual particle pairs, virtual particle pairs have opposite signs so will be propelled in opposite directions thus canceling out any net force.I have yet to year a simple explanation of how this drive works that doesn't dive into theoretical physics to explain its operation. It is true of everything in physics that simple laws lead to complex behavior. If the operation of the EmDrive or other various families of the drive cannot be explained in an abstract way within a couple sentences then it doesn't work.People are being sold snake oil and I don't like it."We don't know how, why, or if it works and known physics do not readily suffice, therefore it doesn't work and its proponents are perpetuating fraud" is jumping the gun a bit, don't you think?
Tornados don't produces magical instruments. They produce junk. Luck doesn't make engineering.The chances of someone stumbling upon some contraption by throwing electronics parts out of his garage together is nil.
QuoteThe microwave communications are possible because microwaves are transmitted from (and to) the satellite. The microwaves obviously are leaving (or entering) the satellite. If there is any propulsion resulting from communications from the satellite, it may not violate the laws of conservation of momentum and conservation of energy, because the microwave photons are leaving the sateliite. It would work like a photon rocket for microwaves leaving the satellite (or like a solar sail for microwave photons hitting the satellite). Scientists have no problems with the concept of a photon rocket (except that it is one the least useful forms of space propulsion: one can also use a military searchlight as a photon rocket).Shawyer's EM Drive is completely different: it is a completely enclosed cavity. The microwaves inside it are standing waves. No microwaves leave the EM Drive. No photons leave the EM Drive (certainly not on purpose). That's why scientists think that the EM Drive should not be able to have any propulsion: because it appears to violate conservation of momentum. The standing microwaves inside an EM Drive cannot be used for communication purposes because they stay inside the EM Drive: the metal acts like a Faraday cage.So what is mystifying, if indeed Shaywer was inspired by this issue, is whether Shawyer did not understand the difference between a completely enclosed microwave cavity and a communications satellite transmitting microwaves or whether the story that he was inspired by this is not really accurate.It would be like somebody saying that they invented a new form of space propulsion based on a flashlight inside a a completely sealed box with mirrors on every inside surface, and claiming that they were inspired by noticing that a satellite in space flashing a light for communications purposes, also acts like a photon rocket. Yes, a flashlight in space will act like a photon rocket, but if you put the flaslight inside a sealed box so that no light leaves the box, it is just a box sitting in space: it is no longer good for communications and it is no longer good for propulsionMy guess - and its no more than that - is that Shawyer concluded the 'thrust' produced by these microwave emitters was significantly greater than that of a photon rocket effect. Despite a fair number of internet searches, I have yet to encounter any details on Shawyer's research into this.....
Quote from: RotoSequence on 04/07/2015 09:23 amQuote from: mlindner on 04/07/2015 08:48 amWhile that's all very interesting. You can immediately rule out the drive's functionality because of the lack of reaction mass. CoM is clearly broken.I only have a minor in physics so I honestly can't understand most of what's talked about here, but I know at the least you can't go about thrusting around the universe with no particles/energy leaving the engine without something like an Alcubierre drive. Even if you're pushing against quantum virtual particle pairs, virtual particle pairs have opposite signs so will be propelled in opposite directions thus canceling out any net force.I have yet to year a simple explanation of how this drive works that doesn't dive into theoretical physics to explain its operation. It is true of everything in physics that simple laws lead to complex behavior. If the operation of the EmDrive or other various families of the drive cannot be explained in an abstract way within a couple sentences then it doesn't work.People are being sold snake oil and I don't like it."We don't know how, why, or if it works and known physics do not readily suffice, therefore it doesn't work and its proponents are perpetuating fraud" is jumping the gun a bit, don't you think?It would be pretty counterproductive if we took the OP's stance to a lot of quantum physics. The world of the quantum often seems to do its own thing and whether it and classical physics will ever be able to coexist happily seems from a layman's viewpoint very much up for debate. But unfortunately saying anything further would be thread drift.@CW you mean something like a quantum wake?