After Years of Silence, We Finally Know More About the SR-71 Blackbird's Successor

Lockheed Martin's Skunk Works recently divulged some information about the SR-72 program to build a successor to the iconic SR-71 Blackbird reconnaissance aircraft. The advanced aircraft development division of Lockheed Martin told Aviation Week that hypersonic technologies, including a combined cycle propulsion system that merges a supersonic jet engine with a rocket engine, have advanced to the point that work on the planned SR-72 can begin in earnest. On paper, the SR-72 will be a strike… (www.popularmechanics.com) Más...