EXPERIMENTS ON THE DISSIPATION OF WARM FOG BY HELICOPTER-INDUCED AIR EXCHANGE OVER THULE AFB GREENLAND

Tests have demonstrated that certain types of shallow fogs can be dispersed by the downwash created by helicopters flying at near-hovering airspeeds at altitudes a few feet above the top of the fog. One helicopter can clear an area about 75 yards wide by a mile long every 10-15 minutes. This system...

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Bibliographic Details
Main Author: Hicks, J. R.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1965
Subjects:
Meteorology
(*FOG
SCATTERING)
(*GREENLAND
FOG)
HELICOPTERS
HELICOPTER ROTORS
AIR TRAFFIC
AIR TRANSPORTATION
FEASIBILITY STUDIES
CONVECTION
LOW ALTITUDE
TABLES(DATA)
RADIOSONDES
DOWNWASH
COUNTERMEASURES
REDUCTION
H-34 AIRCRAFT
THULE GREENLAND
Greenland
Thule
Online Access:http://www.dtic.mil/docs/citations/AD0474070
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0474070
Description
Summary:Tests have demonstrated that certain types of shallow fogs can be dispersed by the downwash created by helicopters flying at near-hovering airspeeds at altitudes a few feet above the top of the fog. One helicopter can clear an area about 75 yards wide by a mile long every 10-15 minutes. This system requires unsafe flying techniques, i.e., near-hovering airspeeds during which time the helicopter is operating at almost full power, low altitudes and positions where an engine failure would probably result in a crash since the aircraft would have to descend through the fog to an unknown landing area. Therefore, this technique is recommended for emergency use only. (Author)

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