Scram

The US Air Force is continuing their successful investigations into scramjets. The most recent example is the X-51A Waverider which traveled 230 miles in six minutes. Prior to their recent string of successes, the longest a scramjet had ever worked was about ten seconds before melting, and now they're shutting them down deliberately. I'm really excited about this: it's an old technology that was abandoned in favor of other areas of research that is finally being given the attention it deserves. While we're on that, you might want to check out Vintage Space which I also have listed on the sidebar.