Vertical Screening Smoke Curtain.
Technical rept. Feb-Dec 73,
EDGEWOOD ARSENAL ABERDEEN PROVING GROUND MD
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The feasibility of producing a rapidly deployed screening smoke curtain from ground level up to 400 feet high and up to 600 feet long was studied. Standard ground-emplaced generators, such as smoke grenades and pots, were found to be unsuitable. These devices projected smoke upwards only a few feet. An experimental ground-emplaced rocket fog oil generator projected a columnar cloud of smoke upward about 100 feet within about 3 seconds. A 400-foot high curtain, 600-feet long, was produced within 10 seconds using a series of explosive-dissemination, 66-mm white phosphorus smoke rockets. The rockets were exploded at altitude intervals of about 100 feet and the phosphorus smoke thermal-pillaring effect was used to create horizontal segments of the curtain, between burst levels. The curtain thus formed remained intact for 30 seconds or more however, the overall travel and position of the curtain, even in the formative stage from the point source rockets, was dependent on wind speed and direction. No curtain was produced in the horizontal segment from ground level to about 100 feet.