Natural and HISS Cloud Droplet Data as Sampled during the 1980-1981 AEFA/St. Paul Field Program

摘要

During the months of January, February, and March 1981, 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-lH 'Huey' and a UH-60A 'Black Hawk' 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-47C 'Chinook' helicopter. The tanker cloud was sampled at various water flow rates, air speeds, humidities, and temperatures. During the test period, each sampling helicopter was equipped with droplet sizing instrumentation.