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Shadowgraphs Of Helicopter-Rotor-Tip VortexesOptical 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.
Document ID
19880000429
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Parthasarathy, Shakkottai P. (Caltech)
Cho, Young I. (Caltech)
Back, Lloyd H. (Caltech)
Date Acquired
August 13, 2013
Publication Date
September 1, 1988
Publication Information
Publication: NASA Tech Briefs
Volume: 12
Issue: 8
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
NPO-16593
Report Number: NPO-16593
ISSN: 0145-319X
Accession Number
88B10429
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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