Two ends of spectrum lately. A blimp and this hypersonic craft. Pretty cool. http://www.washingtonpost.com/blogs...0697b0c-e61e-11e1-936a-b801f1abab19_blog.html Hypersonic craft X-51A put to the test Imagine going from New York to London in less than an hour. The X-51A Waverider, the military’s latest attempt at hypersonic flight, may bring the United States one step closer to realizing that imagined trip duration. The Waverider is a hypersonic combustion ramjet created to, as the name suggests, ride its own shockwave to achieve speeds as high as Mach 6. The vehicle is unmanned and autonomous, according to an Air Force fact-sheet. The almost-wingless craft, which resembles a shark, is not a weapon system protoytpe. But the technology could offer breakthroughs relevant to space travel, hypersonic weapons, surveillance and reconnaissance, and could otherwise give the United States an opportunity to sharpen its competitive edge when it comes to intelligence-gathering.