Experimental investigation of boundary-layer control to helicopter rotor blades to increase forward speed capabilities. 3/4 front view. Shaft angle - 35deg. John Mc.Cloud in picture. He was a good guy.

Photographer NACA

Album A

Location Ames Research Center

Helicopter ARC Ames 40x80ft Wind Tunnel Boundary Layer Aeronautics

Boundary-Layer Control to Helicopter Rotor Blades.