Uh oh, the EMDrive Could be Getting Its “Thrust” From Cables and Earth’s Magnetic Field

A model of the EmDrive, by NASA/Eagleworks. Credit: NASA Spaceflight Forum/emdrive.com

Ever since NASA announced that they had created a prototype of the controversial Radio Frequency Resonant Cavity Thruster (aka. the EM Drive), any and all reported results have been the subject of controversy. Initially, any reported tests were the stuff of rumors and leaks, the results were treated with understandable skepticism. Even after the paper submitted by the Eagleworks team passed peer review, there have still been unanswered questions.

Hoping to address this, a team of physicists from TU Dresden – known as the SpaceDrive Project – recently conducted an independent test of the EM Drive. Their findings were presented at the 2018 Aeronautics and Astronautics Association of France’s Space Propulsion conference, and were less than encouraging. What they found, in a nutshell, was that much of the EM’s thrust could attributable to outside factors.

The results of their test were reported in a study titled “The SpaceDrive Project – First Results on EMDrive and Mach-Effect Thrusters“, which recently appeared online. The study was led by Martin Tajmar, an engineer from the Institute of Aerospace Engineering at TU Dresden, and included TU Dresden scientists Matthias Kößling, Marcel Weikert and Maxime Monette.

EMDrive Thruster: Cavity (Left), Antenna (Middle) and On Balance (Right). Credit: Martin Tajmar, et al.

To recap, the EM Drive is a concept for an experimental space engine that came to the attention of the space community years ago. It consists of a hollow cone made of copper or other materials that reflects microwaves between opposite walls of the cavity in order to generate thrust. Unfortunately, this drive system is based on principles that violate the Conservation of Momentum law.

This law states that within a system, the amount of momentum remains constant and is neither created nor destroyed, but only changes through the action of forces. Since the EM Drive involves electromagnetic microwave cavities converting electrical energy directly into thrust, it has no reaction mass. It is therefore “impossible”, as far as conventional physics go.

As a result, many scientists have been skeptical about the EM Drive and wanted to see definitive evidence that it works. In response, a team of scientists at NASA’s Eagleworks Laboratories began conducting a test of the propulsion system. The team was led by Harold White, the Advanced Propulsion Team Lead for the NASA Engineering Directorate and the Principal Investigator for NASA’s Eagleworks lab.

Despite a report that was leaked in November of 2016 – titled “Measurement of Impulsive Thrust from a Closed Radio Frequency Cavity in Vacuum“ – the team never presented any official findings. This prompted the team led by Martin Tajmar to conduct their own test, using an engine that was built based on the same specifications as those used by the Eagleworks team.

According to tests conducting by a team from TU Dresden, the EM Drive’s thrust may be the result of interaction with Earth’s magnetic field. Credit: ESA/ATG medialab

In short, the TU Dresden team’s prototype consisted of a cone-shaped hollow engine set inside a highly shielded vacuum chamber, which they then fired microwaves at. While they found that the EM Drive did experience thrust, the detectable thrust may not have been coming from the engine itself. Essentially, the thruster exhibited the same amount of force regardless of which direction it was pointing.

This suggested that the thrust was originating from another source, which they believe could be the result of interaction between engine cables and the Earth’s magnetic field. As they conclude in their report:

“First measurement campaigns were carried out with both thruster models reaching thrust/thrust-to– power levels comparable to claimed values. However, we found that e.g. magnetic interaction from twisted-pair cables and amplifiers with the Earth’s magnetic field can be a significant error source for EMDrives. We continue to improve our measurement setup and thruster developments in order to finally assess if any of these concepts is viable and if it can be scaled up.”

In other words, the mystery thrust reported by previous experiments may have been nothing more than an error. If true, it would explain how the “impossible EM Drive” was able to achieve small amounts of measurable thrust when the laws of physics claim it shouldn’t be. However, the team also emphasized that more testing will be needed before the EM Drive can be dismissed or validated with confidence.

What will it take before human beings can travel to the nearest star system within their own lifetimes? Credit: Shigemi Numazawa/ Project Daedalus

Alas, it seems that the promise of being able to travel to the Moon in just four hours, to Mars in 70 days, and to Pluto in 18 months – all without the need for propellant – may have to wait. But rest assured, many other experimental technologies are being tested that could one day allow us to travel within our Solar System (and beyond) in record time. And additional tests will be needed before the EM Drive can be written off as just another pipe dream.

The team also conducted their own test of the Mach-Effect Thruster, another concept that is considered to be unlikely by many scientists. The team reported more favorable results with this concept, though they indicated that more research is needed here as well before anything can be conclusively said. You can learn more about the team’s test results for both engines by reading their report here.

And be sure to check out this video by Scott Manley, who explains the latest test and its results

Further Reading: ResearchGate, Phys.org

NASA’s EM Drive Passes Peer Review, But Don’t Get Your Hopes Up

Artist's concept of an interstellar craft. Credit and Copyright: Mark Rademaker

The “impossible” EM Drive (also known as the RF resonant cavity thruster) is one of those concepts that just won’t seem to die. Despite being subjected to a flurry of doubts and skepticism from the beginning that claim its too good to be true and violates the laws of physics, the EM Drive seems to be clearing all the hurdles placed in its way.

For years now, one of the most lingering comments has been that the technology has not passed peer-review. This has been the common retort whenever news of successful tests have been made. But, according to new rumors, the EM Drive recently did just that, as the paper that NASA submitted detailing the successful tests of their prototype has apparently passed the peer review process.

According to a story by International Business Times, the rumors were traced to Dr. José Rodal, and independent scientist who posted on the NASA Spaceflight Forum that the paper submitted by NASA Eagleworks Laboratories passed peer review and will appear in the Journal of Propulsion and Power, a publication maintained by the American Institute of Aeronautics and Astronautics (AIAA).

A model of the EmDrive. EM Drive prototype by NASA/Eagleworks, via NASA Spaceflight Forum
A model of the EmDrive. EM Drive prototype by NASA/Eagleworks. Credit: NASA Spaceflight Forum

Now before anyone gets too excited, a quick reality check is necessary. At this time, everything said by Dr. Rodal has yet to be confirmed, and the comment has since been deleted. However, in his comment, Rodal did specify the paper would be titled “Measurement of Impulsive Thrust from a Closed Radio Frequency Cavity in Vacuum”.

He also named the papers authors, which includes Harold White – the Advanced Propulsion Team Lead for the Johnson Space Center’s Advanced Propulsion Physics Laboratory (aka. Eagleworks). Paul March was also named, another member of Eagleworks and someone who is associated with past tests.

On top of all that, the IB Times story indicated that he also posted information that appeared to be taken from the paper’s abstract:

“Thrust data in mode shape TM212 at less than 8106 Torr environment, from forward, reverse and null tests suggests that the system is consistently performing with a thrust to power ratio of 1.2 +/- 0.1 mN/Kw ()”.

Artist Mark Rademaker's concept for the IXS Enterprise, a theoretical interstellar spacecraft. Credit: Mark Rademaker/flickr.com
Artist Mark Rademaker’s concept for the IXS Enterprise, which relies on the Aclubierre Drive – something NASA’s Eagleworks is also investigating. Credit: Mark Rademaker/flickr.com

But even if the rumor is true, there are other things that need to be taken into account. For instance, the peer-review process usually means that an independent panel of experts reviewed the work and determined that it is sufficient to merit further consideration. It does not mean the conclusions reached are correct, or that they won’t be subject to contradiction by follow-up investigations.

However, we may not have to wait long before the next test to happen. Guido Fetta is the CEO of Cannae Inc., the inventor of the Cannae Drive (which is based on Shawyer’s design). As he announced on August 17th of this year, the Cannae engine would be launched into space on board a 6U CubeSat in order to conduct tests in orbit.

As Fetta stated on their website, Cannae has formed a new company (Theseus Space Inc.) to commercialize their thruster technology, and will use this deployment to see if the Cannae drive can generate thrust in a vacuum:

“Theseus is going to be launching a demo cubesat which will use Cannae thruster technology to maintain an orbit below a 150 mile altitude.  This cubesat will maintain its extreme LEO altitude for a minimum duration of 6 months.  The primary mission objective is to demonstrate our thruster technology on orbit.  Secondary objectives for this mission include orbital altitude and inclination changes performed by the Cannae-thruster technology.”

Artist's impression of Pluto and its moons. Credit: NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute
If feasible, a mission using the EM Drive could travel from Earth to Pluto in just 18 months, compared to the 9.5 years taken by the New Horizons mission. Credit: NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute

By remaining in orbit for six months, the company will have ample time to see if the satellite is experiencing thrust without the need for propellant. While no launch date has been selected yet, it is clear that Fetta wants to move forward with the launch as soon as possible.

And as David Hambling of Popular Mechanics recently wrote, Fetta is not alone in wanting to get orbital tests underway. A team of engineers in China is also hoping to test their design of the EM Drive in space, and Shawyer himself wants to complete this phase before long. One can only hope their drives all prove equal to the enterprise!

While this could be an important milestone for the EM Drive, it still has a long way to go before NASA and other space agencies consider using them. So we’re still a long away from spacecraft that can send a crewed mission to Mars in 70 days (or one to Pluto in just 18 months).

Further Reading: Emdrive.com, Popular Mechanics, IB Times