The Sikorsky Rotor Systems Research Aircraft (RSRA) in helicopter configuration flight without the wings and two General Electric TF34-GE-404A engines. (NASA)
Sikorsky_S-72_NASA_741_in_flight_(AC82-0198-26)
The Sikorsky Rotor Systems Research Aircraft (RSRA) in helicopter configuration flight without the wings and two General Electric TF34-GE-404A engines. (NASA)