Hi, I know this sounds crazy but I just found this really interesting idea at wwww.amasci.com. It's basicly a plan for a hovering heavier then air blimp, which can travel faster then the speed of sound, without making a sonic boom. It sounds like a UFO and I just want to know if its phyiscally possible. The page can be found at http://www.amasci.com/amateur/vortgen.html Under the the title HIGH-SPEED VORTEX BLIMP about half way down the page. Thx.