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 artificial cloud that more closely resembled a natural one. The new nozzles required a new HISS calibration effort. (Author)
Droplet Size and Liquid Water Characteristics of the USAAEFA (CH-47) Helicopter Spray System and Natural Clouds as Sampled by a JUH-1H Helicopter
1980
271 pages
Report
No indication
English
Aircraft , Snow, Ice, & Permafrost , Ice formation , Helicopters , Sprays , Stratus clouds , Supercooling , Adhesion , Artificial precipitation , Flow rate , Water flow , Humidity , Atmospheric temperature , Winter , Ice , Optical detectors , Light scattering , drops , Particle size , Spray nozzles , Visibility , Spectrometers , Photodetectors , Flight testing , Airspeed , H-1 aircraft , UH-1H aircraft , HISS(Helicopter Icing Spray System) , H-47 aircraft , Ice detection , Artificial clouds
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