Game changer or will this amount to nothing? I wonder if Space X would be looking at something like this to cut Earth>Mars transfer times.
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.
According to good scientific practice, an independent third party needed to replicate Shawyer's results. As Wired.co.uk reported, this happened last year when a Chinese team built its own EmDrive and confirmed that it produced 720 mN (about 72 grams) of thrust, enough for a practical satellite thruster. Such a thruster could be powered by solar electricity, eliminating the need for the supply of propellant that occupies up to half the launch mass of many satellites. The Chinese work attracted little attention; it seems that nobody in the West believed in it.
However, a US scientist, Guido Fetta, has built his own propellant-less microwave thruster, and managed to persuade Nasa to test it out. The test results were presented on July 30 at the 50th Joint Propulsion Conference in Cleveland, Ohio. Astonishingly enough, they are positive.
NASA has conducted long-awaited experiments to prove that the fabled space drive, capable of generating its own thrust and breaking a fundamental law of physics, works. If the find survives fresh scrutiny, space ship construction will be revolutionized.
The drive’s creator, British scientist Roger Shawyer, has been facing criticism since his 2006 claims, based on the premise that thrust can be created without huge thrusters, instead using electricity to direct microwaves inside a special container.
Shawyer’s company, SPR Ltd., writes that it has “demonstrated a remarkable new space propulsion technology. [It] has successfully tested both an experimental thruster and a demonstrator engine which use patented microwave technology to convert electrical energy directly into thrust. No propellant is used in the conversion process. Thrust is produced by the amplification of the radiation pressure of an electromagnetic wave propagated through a resonant waveguide assembly.”
In short, if the results hold up, humanity can say goodbye to huge energy consumption costs associated with space travel, and say hello to deep-space missions and distant world exploration at a fraction of the cost and at 100 times the speed.
Edited by zhangm, 01 August 2014 - 16:14. Reason: Added excerpts.