Based on the FDL - 7 the Silver Dart was a lifting body concept designed to glide from hypersonic speeds of Mach 22 down to landing .
The FDL - 7 is a lifting body aircraft designed for near earth orbital flight by the US Airforce Flight Dynamics Laboratory .
Based on the FDL - 7 , a lifting body aircraft designed for near earth orbital flight by the US Airforce Flight Dynamics Laboratory , the Silver Dart was a lifting body concept designed to glide from hypersonic speeds of Mach 22 down to landing .