National Security Journal on MSN

The X-20 Dyna Soar Mach 20 'scramjet' space plane has a message for the US Air Force

Synopsis: The X-20 Dyna-Soar was a Cold War-era attempt to build a reusable, piloted, winged spaceplane that could ride a ...
Modern Engineering Marvels on MSN

Mach 9.6 still matters: X-43A proved hypersonic flight can’t be simulated away

The set of problems that have never had a “just run it in the tunnel” has never had a hypersonics set. What X-43A has brought with it forever is that it made reality confront an engineering problem ...