Accession Number : AD0613288

Title :   AN INVESTIGATION OF WHITEOUT DISSIPATION TECHNIQUES.

Descriptive Note : Final rept.,

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Personal Author(s) : Jiusto,James E. ; Mee,Thomas R. ,Jr.

Report Date : MAY 1964

Pagination or Media Count : 25

Abstract : Means for modifying whiteouts in arctic regions in support of Army functions were investigated. An experimental program (1960) in Greenland demonstrated that dry ice seeding of supercooled clouds (fog) would facilitate certain operations in whiteouts. Various seeding techniques compatible with the arctic environment were subsequently studied; the techniques involved seeding from aircraft, rockets, tethered blimps and drones. A bench-model pellet maker was constructed for efficient conversion of liquid carbon dioxide to dry-ice pellets of a prescribed size. The relationships among dry-ice pellet size, pellet fall velocity and distance, cloud temperature, and number of ice crystals produced were established. With this information, favorable seeding patterns and equipment were postulated to fulfill the following objectives: (1) To maintain safe landing corridors at fixed ice cap installations. (2) To provide aircraft with an emergency landing capability over isolated terrain. (3) To facilitate certain ground operations. (Author)

Descriptors :   (*FOG, COUNTERMEASURES), (*ARTIFICIAL PRECIPITATION, FOG), CLOUD COVER, SNOW, VISIBILITY, CARBON DIOXIDE, SOLIDIFIED GASES, PELLETS, SCATTERING, AIRCRAFT, ROCKETS, ALL WEATHER AVIATION, GREENLAND, TEST METHODS, METEOROLOGY

Distribution Statement : APPROVED FOR PUBLIC RELEASE