Optical apparatus produces full-scale or larger shadowgraph of tip vortexes of helicopter rotor. Stroboscope projects shadow image of helicopter rotor on large, square screen. Commercial, highly reflecting projection screen used; simply projecting image on white wall does not yield enough light for photographing vortexes with standard 35-mm camera. Apparatus adapts to use in large wind tunnels.
Shadowgraphs Of Helicopter-Rotor-Tip Vortexes
NASA Tech Briefs ; 12 , 8
1988-09-01
Miscellaneous
No indication
English
ROTOR HEAD OF HELICOPTER, MULTI-ROTOR TYPE HELICOPTER AND HELICOPTER
European Patent Office | 2017
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