Sikorsky Bearingless Main rotor (SBMR) mounted on the Ames Rotor Test Apparatus (RTA) for testing in the NASA Ames40x80ft Subsonic Wind Tunnel, test-584.
Photographer Dominic Hart
Sikorsky Bearingless Main rotor (SBMR) mounted on the Ames Rotor Test Apparatus (RTA) for testing in the NASA Ames40x80ft Subsonic Wind Tunnel, test-584.