3/4 front view of Lockheed Rigid Rotor model in Ames 40x80 foot wind Tunnel.
Lockheed XH-51 Experimental Rigid Rotors, no hinges, in Ames 40x80 foot wind tunnel. John McCloud (left sitting) Jack Rabbot (Right).
Rigid Tilt Rotor Research: Boeing 26-ft. diameter proprotor on semi-span wing in Ames Research Center 40x80ft w.t. (Photo by Ames photographer Lee Jones; composite of test results by Ames Graphics)