The SR-71 was one of the first aircraft to have "stealth" factored into its design -- that is, to be hard for radar systems to detect because of the contours of the airframe or the use of certain materials, or both. The much more angular aircraft seen here, code-named "Have Blue," marked a much more concerted effort to create a stealth aircraft. Lockheed developed a pair of these experimental flying machines in the mid-1970s, with the first flight taking place in December 1977. The Air Force describes "Have Blue" as "the first fixed-wing aircraft designed from an electrical engineering (rather than an aerodynamic) perspective."
June 23, 2013 8:45 AM PDT
Photo by: U.S. Air Force / 49th Wing History office