Tremulis Boeing X20 Dyna Soar, early 1960s, conceived nearly twenty years before the Space Shuttle. (Public domain / National Aeronautics and Space Administration)
23-Dyna-Soar
23-Dyna-Soar
Tremulis Boeing X20 Dyna Soar, early 1960s, conceived nearly twenty years before the Space Shuttle. (Public domain / National Aeronautics and Space Administration)