Earlier quoted context omitted.
Given the small amounts involved, it's worth the money just to figure out the source of experimental error. NASA isn't giving money to random kooks off the street, these are actual physicists in labs doing the work.
Steuard is too polite to point this out himself, so I will do it for him: he is a physics professor. That the amount of money is small is a measure of how incredibly unlikely he thinks any useful result would come from the experiments.
What we know about the EmDrive and Cannae Drive
101–110 of 180 posts
Re: What we know about the EmDrive and Cannae Drive
#102Earlier quoted context omitted.
Yes, sure, they've measured something surprising. I have no reason to doubt that. A few years ago, the enormously more respected folks at the OPERA experiment were willing to announce that they had seemingly detected neutrinos moving faster than light. Despite this coming from a large group of scientists with top-notch credentials, that was immediately doubted by almost the entire physics community, and sure enough,…
So, it is worth bringing up: GR doesn't require global conservation of momentum or energy.[0,1] I'm not saying anything about the experiment, but I think your statement that "conservation of momentum is more deeply embedded..." isn't quite so accurate. [0] http://www.preposterousuniverse.com/blog/2010/02/22/energy-i... [1] http://math.ucr.edu/home/baez/physics/Relativity/GR/energy_g...
Conservation of momentum is not more deeply embedded than c in that it isn't even a law (outside of classical mechanics) to begin with.
Re: What we know about the EmDrive and Cannae Drive
#103This is not worth getting excited about. Really. Extraordinary claims require extraordinary evidence. These drives would violate conservation of momentum.[0] Conservation of momentum is built in to the known laws of physics at an extraordinarily deep level. It is obviously not impossible that our known laws are wrong, but the alternative would be to somehow produce a radically different set of physical laws that neve…
> Extraordinary claims require extraordinary evidence So what do you call a second, replicated experimental setup conducted in vacuum, if not extraordinary?
Re: What we know about the EmDrive and Cannae Drive
#104I know it's unlikely that the EmDrive is real, and even more unlikely that the "warp drive" effects that some have been talking about are real. But...I really hope they are. What a world it'd be if these things prove out to be real.
I think even if it proves real, it would still take around 50 years to put in flying cars and such. But perhaps a bit less for using it in satellites. Still it's not too long on the humanity scale of time.
Re: What we know about the EmDrive and Cannae Drive
#105Earlier quoted context omitted.
According to physicist Harold White, leader of the NASA Eagleworks team, it can't simply be a "photon rocket": The NASASpaceflight.com group has given consideration to whether the experimental measurements of thrust force were the result of an artifact. Despite considerable effort within the NASASpaceflight.com forum to dismiss the reported thrust as an artifact, the EM Drive results have yet to be falsified. After c…
Yes, sure, they've measured something surprising. I have no reason to doubt that. A few years ago, the enormously more respected folks at the OPERA experiment were willing to announce that they had seemingly detected neutrinos moving faster than light. Despite this coming from a large group of scientists with top-notch credentials, that was immediately doubted by almost the entire physics community, and sure enough,…
I'm no physicist but this guy[1] is, and his paper — which is based off of research with evidence backing it up in the 1970's — suggests that the EmDrive creates propulsion from Unruh radiation[2].
[1]http://physicsfromtheedge.blogspot.co.uk/2015/04/light-in-bo...
Re: What we know about the EmDrive and Cannae Drive
#106Earlier quoted context omitted.
isn't that super low? if 1 micronewton = 1 newton * 10^-6 then to push against 1kg it would require 1.000 MWatts?
Super-low compared to pushing against matter. But 300x higher than pushing against photons.
Re: What we know about the EmDrive and Cannae Drive
#107I've some direct experience with a similar situation. I can speak to the issue of "why hasn't spaceX or other major company experimented with this". During the "Cold Fusion" era, when Pons & Fleishman had claimed to develop room temperature fusion, I worked for a major US lab doing superconductor research. (We invented the first superconductors that operated at liquid nitrogen temperatures-- Y1B2C3O) While fusion isn…
This is one of the many reasons why I consider all "fururist" media as just sci-fi wish fulfillment for kiddies. Its just incredible how unreadable /r/futurology is, for example. Its just a lot of pats on the back about some amazing life-changing technology, that is eternally 10 years away. I don't have access to the Mondo 2000 stuff today, but if any of that was to believed we'd have AI masterminded rockets to moon…
eh-hem implying the Myers-Briggs Personality Type is based on rigorous science /sardony /irony.
Re: What we know about the EmDrive and Cannae Drive
#108Earlier quoted context omitted.
This is one of the many reasons why I consider all "fururist" media as just sci-fi wish fulfillment for kiddies. Its just incredible how unreadable /r/futurology is, for example. Its just a lot of pats on the back about some amazing life-changing technology, that is eternally 10 years away. I don't have access to the Mondo 2000 stuff today, but if any of that was to believed we'd have AI masterminded rockets to moon…
I love reading /r/futurology comments for comedy purposes, but I have a weird sense of humor
Re: What we know about the EmDrive and Cannae Drive
#109Earlier quoted context omitted.
This is less like flush toilets and more like computers. It took nearly 50 years for the first computers to sit in consumer's home offices. It took time for the technology to be miniaturized and cheap enough to make its way to consumer electronics. Or even cell phones. We were using radio signals in hand held devices for nearly 50 years before a vast majority of consumers were walking around with phones in their pock…
If this were proven true, there would be a completely manic gold-rush of capital into the area. Flying cars that operate at less than 1/10th the energy of cars on the road now? This would very quickly move from "let's wait for NASA to do more tests" to "let's beat NASA to the test." That's all assuming it's real, of course. I'd bet against it.
Re: What we know about the EmDrive and Cannae Drive
#1101 micronewton / watt is a surprising amount of thrust. The implied velocity of whatever it's pushing against is 1e6 m/s, which is 1/300 the speed of light.