Call me an old fogey, but I’ve always believed in the law of conservation of momentum … yet a recent NASA finding — if it holds up — may bring me around:
Nasa is a major player in space science, so when a team from the agency this week presents evidence that “impossible” microwave thrusters seem to work, something strange is definitely going on. Either the results are completely wrong, or Nasa has confirmed a major breakthrough in space propulsion.
British scientist Roger Shawyer has been trying to interest people in his EmDrive for some years through his company SPR Ltd. Shawyer claims the EmDrive converts electric power into thrust, without the need for any propellant by bouncing microwaves around in a closed container. He has built a number of demonstration systems, but critics reject his relativity-based theory and insist that, according to the law of conservation of momentum, it cannot work.
“Test results indicate that the RF resonant cavity thruster design, which is unique as an electric propulsion device, is producing a force that is not attributable to any classical electromagnetic phenomenon and therefore is potentially demonstrating an interaction with the quantum vacuum virtual plasma.”
This last line implies that the drive may work by pushing against the ghostly cloud of particles and anti-particles that are constantly popping into being and disappearing again in empty space. But the Nasa team has avoided trying to explain its results in favour of simply reporting what it found: “This paper will not address the physics of the quantum vacuum plasma thruster, but instead will describe the test integration, test operations, and the results obtained from the test campaign.”
The drive’s inventor, Guido Fetta calls it the “Cannae Drive”, which he explains as a reference to the Battle of Cannae in which Hannibal decisively defeated a much stronger Roman army: you’re at your best when you are in a tight corner. However, it’s hard not to suspect that Star Trek‘s Engineer Scott — “I cannae change the laws of physics” — might also be an influence. (It was formerly known as the Q-Drive.)