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22-Foot Subsonic Tunnel 22-Foot Tunnel 60 percent 60-percent position airflow B/D V/D CE Vss Blade tip Bragg cell calibration grid board D C B A PE_ 4029 delay dual prism assembly Figure 11 flow patterns Free-stream velocity ft/sec helicopter rotor model integrated circuit Langley Research Center laser light sheet Leighty light sheet position m/sec monostable multivibrator NASA Langley 14 NASA Langley Research nine blades number of blades optics package output pulse Performing Organization phase detector phase lock loop phase synchronous programmable divider propylene glycol pulse length pulses per revolution record the flow Research Center Hampton rotor disk Rotor Flow Visualization Schematic diagram Sheet for Helicopter shown in figure single PPR signal SIT camera slow-motion smoke strobe angle strobe duration strobe length circuit Strobed Laser Light synchronizing circuit Synchronous Strobed Laser test section tip velocity tunnel testing Vapor video camera video frame video image video recordings wind tunnel zero