This may be of interest as well: http://www.newscientist.com/data/images/ns/av/shawyertheory.pdf "A Theory of Microwave Propulsion for Spacecraft" Frankly, I'm skeptical. I've seen plenty of revolutionary schemes in the past. We've still got a long way to go lowering launch costs on chemical rockets, and I KNOW that works. Ad Astra, Ray -------------------------------------------- On Sat, 8/2/14, Willow Schlanger <wschlanger@xxxxxxxxx> wrote: I also discovered I have an old paper on the EmDrive from "Satellite Propulsion Research Ltd." The filename is "theory paper V9.3.doc" and I received it September 16, 2006 from (if I remember correctly) Roger Shawyer. Here is the first sentence from the Abstract: "A new principle of electric propulsion for spacecraft is introduced, using microwave technology to achieve direct conversion of d.c. power to thrust without the need for propellant."