|EmDrive, illustration by Elvis Popovic|
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. (wired.co.uk, "NASA Validates Impossible Space Drive," July 31, 2014, David Hambling.)
|EmDrive, Image: SPR Ltd.|
The Nasa paper projects a 'conservative' manned mission to Mars from Earth orbit, with a 90-ton spacecraft driven by the new technology. Using a 2-megawatt nuclear power source, it can develop 800 newtons (180 pounds) of thrust. The entire mission would take eight months, including a 70-day stay on Mars. (wired.co.uk, "10 Questions about NASA's 'impossible' Space Drive Answered", Aug. 7, 2014, David Hambling.)
What the what?