Field tests were conducted with operational helicopters at Fort Rucker, Ala., and at the Waterways Experiment Station to determine downwash velocity profiles. In addition, tests utilizing scale-model rotor blades were made at the WES over wet and dry sands and a dry lean clay, and over a chemically stabilized soil, plastic-impregnated soils, and lightweight ground covers (membranes) to determine modelscale velocity profiles and air velocities at the ground surface required to dislodge and move particles of various types of soil, the size of soil area requiring protection for various VTOL aircraft, and the effectiveness of membranes and soil stabilization in preventing dust-cloud formation. (Author)
Helicopter Downwash Blast Effects Study
1964
43 pages
Report
No indication
English
NTIS | 1974
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