The law of conservation of momentum says that a rocket (or anything else) can't accelerate forward without some form of exhaust ejected backward. But in 1998, a British engineer named Roger Shawyer announced the seemingly impossible—he had built a closed system that could generate thrust.
Twenty years later and many scientists still call the Shawyer's EmDrive impossible, but that hasn't stopped DARPA, the Defense Department agency that funds potential technological breakthroughs of all kinds, from putting serious money behind it.
EmDrive - Works - Imagine - Cone—a - Tube
Here's how the EmDrive works. Imagine you have a truncated cone—a tube wider at one end than the other—made of copper. Seal it, then fill it with microwaves. Like other electromagnetic radiation, microwaves exert a tiny amount of pressure. But because of the shape of this device, they would exert slightly more force on one end than the other. So, even though it’s a closed system, the cone would experience a net thrust and, if you had enough microwaves, it would gradually accelerate.
Build it to a large enough scale and you could revolutionize propulsion.
Skepticism - Physicists - SGU - Website - Idea
But all of this should be theoretically impossible, hence the skepticism hurled by respectable physicists and SGU, a skeptic website that compared the idea behind the EmDrive to someone trying to move a car forward by pushing on the dashboard.
Undeterred by the fact that it would seem to be physically impossible, independent imitators testing the EmDrive theory have nonetheless reported small but measurable thrust from their own EmDrives. These include Chinese researchers at Northwestern Polytechnic in Xi’an, NASA’s Eagleworks, and the American company Cannae, which plans to launch a commercial version into space. A German team at Dresden is evaluating the EmDrive and will report next year, though early results suggest thrust measurements could instead be stray magnetic fields.
Physics - Establishment - Reports - Thrust
To the physics establishment, these reports of positive thrust are an...
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