Propellantless Space Drive Called "EmDrive" Made in China
February 9, 2013 11:10 AM
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It's a a propellantless microwave thruster that defies Newton's laws of motion
Chinese scientists have taken on a heavily criticized space drive idea that could one day launch satellites, deep space probes and even flying cars.
The research team hails from Northwestern Polytechnic University in Xi'an, and was led by Yang Juan. What they developed was a propellantless microwave thruster called EmDrive, which is a controversial idea because it goes against Newton's laws of motion -- and many have claimed to create a "propellantless" thruster before and failed.
Newton's laws of motion are all based on the idea that firing propellant out of the back at a high speed will push a craft forward. While
solar cells offer infinite power
, thrust is limited by propellant. Many have tried to get around this, but several scams have made this particular field a joke in the scientific world.
While space drives tend to rely on Newton's laws of motion, the EmDrive is a closed, conical container that has a net thrust toward the wide end when filled with resonating microwaves. This goes against Newton, who said that no closed system could have a net thrust. However, EmDrive works because the microwaves have a group velocity (the speed of a collection of electromagnetic waves) that is greater in one direction than the other -- which is where Albert Einstein's theory of relativity comes in.
British engineer Robert Shaywer, who began looking at the concept of a propellantless thruster when he opened his own company called Satellite Propulsion Research in 2001, is the original creator of the EmDrive. He made demonstration thrusters to prove it could be done, and even made sure the test results were accurate (meaning, the results weren't affected by friction, ionization, air currents, electromagnetic effects or interference). The first, made in 2003, had a thrust of 16 mN. This was enough to show it could be done.
However, he received a ton of criticism for his idea and was ridiculed in his own country. But the Chinese team at Northwestern Polytechnic University believed in his research and took the project head on to author the latest study, "Net Thrust Measurement of Propellantless Microwave Thruster."
The Northwestern Polytechnic University team was able to create the EmDrive with 720 mN of thrust with a couple of kilowatts of power.
So what purpose does EmDrive have? It could halve launch costs of satellites because as much as half
the launch weight
of these objects are attributed to propellant.
Shawyer is even working on a superconducting thruster that could be ready as soon as 2016. It would boost the Q value of the cavity, which determines the amount of thrust produced. He said it could be boosted by a factor of several thousand, possibly equating to a tonne of thrust per kilowatt of power.
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RE: China isn't 40 years behind us anymore.
2/12/2013 3:55:39 PM
If you do not excel in school in these countries you are cast out.
In the US we don't cast them out, we just spend tons of money continuing to teach them even though those students will never learn any more that what they already have. Is it more wise to throw money at something and never change the outcome?
I have a good friend who is from China, and from what he describes they do not simply "cast them out". Sure they are not sent along to the University to waste four more years being taught things they will never learn, but they are sent to trade schools where they are taught skills such as welding, construction, auto mechanics, and other useful skills that may not require a genius level intellect to learn. For those who can not make it even at this level those are sent to be simple manual laborers.
Heaven forbid we delegate anyone here to being a simple manual laborer! No, everyone deserves to be a CEO level employee even if they only ever sit on their backside and wait to be handed everything they could ever want. I have already seen this attitude with the younger people we have tried to hire lately. One of the first things out of most of their mouths is " I don't work overtime and definitely no weekends", yet they want to be paid as much as someone who will put more effort into doing a job.
As far as the attitude the Chinese students put towards their studies, I remember in college that everyone hated having a Chinese student in class, because it meant there would be on curve in the grading, because the Chinese students would spend all of their free time studying and restudying for every class. I may have never put quite that much devotion into my studies, but I can say that having them in my classes made me a better student because I tried not to be left behind by them.
China pretty much still has the policy that the US had about 100 years ago, and that is if you don't work you don't eat. Only in the past 100 years or so has the world had a no one left behind policy which allows success even for those who put forth no effort. This is not something that has come about because of increased compassion, no, it has come about because those in power found it was a good way to maintain their power. In western democratic societies you stay in power by keeping the populace complacent and happy, while in the more authoritarian eastern societies you stay in power more by force.
A friend of mine at work said it pretty well the other day when it comes to how our current society promotes advanced learning. He said he spent four years earning a degree in Political Science and now he works in a laboratory. His degree is pretty much worthless yet no adviser ever told him that might be the case. He said "I wasted four years and a lot of money getting a degree I can not use when I could have spent those four years actually earning money from a regular job and be four years ahead financially." So, does a college degree really pay for itself for everyone who gets one, or just for those few to enter a field where it is actually a necessity?
RE: China isn't 40 years behind us anymore.
2/14/2013 11:54:06 AM
I agree that education should not be limited to academics and college. We are failing at introducing children to meaningful education in the trades and crafts. At least in my experience, in NJ, if you went to the vocational high school you were pretty much deemed a loser/junky. Shop courses have been virtually eliminated. Without introduction to these career choices many kids may never find a career that they could have been passionate about. In your comment you reference that failing students in Asian schools are left to manual labor, i refer to them as cast out. The manual labor/low education/skills jobs are rapidly drying up in the United States. Many of these jobs are filled by illegal aliens. Of course the standard blurb that we are fed is that the illegals are doing jobs Americans do not want. What the illegals are doing is jobs that Americans do not want at that low of a wage. The large supply of illegal (sub minimum wage) labor drives down the salary and benefits that would otherwise have to be paid for these jobs. Unfortunately it is going to get worse. As we move to autonomous vehicles, the last high paying low skill jobs: truck driver, taxi/limo driver are going away. So really with the exception of adding more trade/craft training we are not going to have any manual labor jobs. So the U.S is ahead of the curve in recognizing that the entire populace has to be educated or the subsequent have/have not divide will be so great that conflict is inevitable.
"When an individual makes a copy of a song for himself, I suppose we can say he stole a song." -- Sony BMG attorney Jennifer Pariser
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