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The ‘future’ of space travel slips into the past



  • The proposed EmDrive captures the public imagination with the promise of ultra-fast space travel that breaks the laws of physics.
  • Some researchers have detected a driving force from EmDrive that appears to prove valid to be technology.
  • A reliable new study says no, those results are just “false positives”.

  • When Roger Shawyer’s EmDrive was first proposed in 2001, it seemed too good to be true. The proposed electromagnetic drive (known for short as “Em”
    😉 does not require fuel and therefore is so lightweight that it promises to provide travelers across the universe at unprecedented speeds. Don’t worry, EmDrive’s work appears to violate Newton’s third law of motion – one about every action that produces an equal and opposite reaction.

    Now it looks like yes.
    Is Too good to be true, scientists at Dresden University of Technology (TU Dresden) have proven that EmDrive is not generating any momentum.They provide compelling evidence that little indication of the momentum in previous research was. Just false positives caused by external forces.

    How should EmDrive work?

    Credit: AndSus / Adobe Stock

    In EmDrive, the company that owns the invention rights, says “The propulsion is due to pressure amplification, the radiation of the electromagnetic waves propagated through a series of resonant waveguides,” in other words, the trapped microwaves are bounced around a specially shaped vessel, creating a thrust. Let the whole thing go forward

    They also confirmed that while EmDrive did not meet the conditions it spoke to Newton’s third law, the company said it was in perfect harmony with the second:

    “This relies on Newton’s second law, in which force is defined as the rate of change of momentum, so an electromagnetic wave (EM) traveling at the speed of light has a certain momentum, which is then transferred to the reflector to make it scale. Small forcing. ”

    Your interest in EmDrive is understandable, considering what you should say to
    Popular mechanics Last year, DARPA’s EmDrive chief investigator Mike McCulloch explained that the engine could “Change the style of space travel and watch the spacecraft quietly lift off the launch pad and reach outside the solar system,” he said of his excitement being able to travel from here to Proxima Centauri, further afield. 4.2465 light years in just 90 human years.

    It doesn’t work. Yes. No, it can’t.

    NASA Eagleworks EmDriveCredit: NASA / Wikimedia Commons

    DARPA, part of the US Department of Defense, is just one of the organizations reviewing EmDrive’s claims.In 2018, the agency invested $ 1.3 million to study the device in research to be concluded this May, with the exception of advances. At any important last minute

    Teams from all over the world have been testing Shawyer’s ideas since the launch and frequently released results of conflicting tests. This may have something to do with the fact that the team that detects any EmDrive thrust has reported a small amount missing, measured in milli-newtons (mN) mN equal to approximately 0.00022 pounds of force.

    As Paul Sutter wrote on an op-ed for Space.com:

    “Since the EmDrive concept in 2001, every few years, one group has claimed to measure the net force coming from their devices. But these researchers are measuring an incredibly small effect: a force so small it can’t move. This leads to statistical instability and measurement errors. ”

    To get an idea of ​​how small these results are, consider that the possible thrusts reported by NASA in 2014 at 30-50 micron are equivalent to the weight of a large ant. Chinese researchers claim 720 mN was detected in their test. That would be 72 grams of the thrust of the iPhone 11 with the case weighing 219 grams.

    Too small to stand out against the background noise.

    These little EmDrive impulses are at the heart of what TU Dresden researchers have to say: the effect is too small to distinguish effects that are not from EmDrives. EmDrive’s high-precision propulsion and elimination of false positive effects “tells the story. Two more studies are here and here.

    When the UT Dresden team activated EmDrive, according to NASA’s EmDrive, they saw little, too.

    However, Martin Tajmar of UT Dresden told German media GreWi they soon realized what happened: “When the power enters the EmDrive, the engine heats up. scale To move on to a new zero, we can prevent that in an improved structure.

    Putting kibosh in the results of other researchers, the authors of the study wrote:

    “Using geometry and operating conditions was similar to a model by White et al., Reporting positive results published in the peer-reviewed literature. Nancy, many of our data limits the unusual momentum. It is below the classical radiation equivalent force for a given amount of energy.This provides a strong limit to all proposed theories and rules out the previous test results by more than three sequences of magnitude. ”

    This seems to be the end of the EmDrive story.

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