Accession Number : ADA107578


Title :   Droplet Size and Liquid Water Characteristics of the USAAEFA (CH-47) Helicopter Spray System and Natural Clouds as Sampled by a JUH-1H Helicopter.


Descriptive Note : Final rept. Jan-Mar 80,


Corporate Author : METEOROLOGY RESEARCH INC ALTADENA CA


Personal Author(s) : Humbert,M E ; Jahnsen,L J ; Dzamba,L D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a107578.pdf


Report Date : Aug 1980


Pagination or Media Count : 271


Abstract : During the months of January, February, and March 1980, the US Army Aviation Engineering Flight Activity (AEFA) conducted natural and artificial icing tests in the vicinity of St. Paul, Minnesota. The natural events involved exposure of a fully instrumented JUH-1H 'Huey' Helicopter to extended periods of flight in supercooled stratiform clouds. The artificial portion of the testing required the same aircraft to fly in the cloud produced by the helicopter icing spray system (HISS) aboard a CH-47 'Chinook' Helicopter. The tanker cloud was sampled at various water flow drates, ranges, humidities, and temperatures. During the test period, the sampling helicopter was equipped with droplet sizing instrumentation provided by Meteorology Research, Inc. (MRI). A similar program was performed during the winter of 1978-1979 (Anderson and Jahnsen, 1979), but nozzle reconfiguration and other modifications to the HISS were necessary to produce an artifical cloud that more closely resembled a natural one. The new nozzles required a new HISS calibration effort. (Author)


Descriptors :   *ICE FORMATION , *HELICOPTERS , *SPRAYS , FLIGHT TESTING , LIGHT SCATTERING , PARTICLE SIZE , WATER FLOW , ADHESION , ATMOSPHERIC TEMPERATURE , WINTER , FLOW RATE , ICE , DROPS , VISIBILITY , AIRSPEED , PHOTODETECTORS , OPTICAL DETECTORS , SUPERCOOLING , HUMIDITY , SPECTROMETERS , STRATUS CLOUDS , ARTIFICIAL PRECIPITATION , SPRAY NOZZLES


Subject Categories : Helicopters
      Meteorology
      Optical Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE