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> Don't dismiss this article just because of the main image. It's a image of an EmDrive that is another impossible device that doesn't work Do you have a link
by rurounijones 7y ago
> Don't dismiss this article just because of the main image. It's a image of an EmDrive that is another impossible device that doesn't work
Do you have a link for that? I haven't been following the EM Drive but a quick google now suggests that a team in Germany believe that they found the reason for the anomolous readings but I cannot find anything definitive.
- dmix 7y agoLast time it came up on HN people mentioned there was a lot of woo related to Em Drives on the internet so be wary.
- knzhou 7y agoThe problem with EM drive testing in general is that you're looking for a signal (thrust) which should be zero, while pumping an enormous amount of energy into a system, and declaring any nonzero reading as success. Physicists know from experience that this is a recipe for fooling yourself. There are a million things that could imitate the purported signal. In the last EM drive test I looked at, the "thrust" was pointing in the wrong direction, and moreover it perfectly matched the temperature curve of the apparatus, even though no theories of the EM drive say it should. That is a dead giveaway that the temperature is causing a fake signal, which e.g. could happen by thermal expansion messing up the meters. In general, the EM drive seems like a playground for sloppy experimentalists, because what anybody else would call a failure can be reported as a success.
- taneq 7y ago> declaring any nonzero reading as success And as anyone who's worked with sensors should know, if your sensor is reading exactly zero, that means your sensor is broken.