I have heard of this thory (I guess) and when I look it up it is tied in with the "Aurora" spy plane. Which, would give it a supposed speed of mach 6 or so. Also, I have seen a photo of a contrail which is deemed "donuts on a string" that is allegedly tied in with this type of propulsion. What is your guys' take on this? CR3, Sparky, all of you guys that are in the "know" what say you on this topic?
Also, there is a pic from a weather satellite that shows a contrail (again the donuts on a string) starting from Nevada and crossing onto the atlantic...