Suter, Ann . 2000. Drop Testing Airtankers: A Discussion of the Cup-and-Grid Method. 0057 2868. Missoula, MT: U.S. Department of Agriculture, Forest Service, National Technology and Development Program. 14 p.
Presents the development of drop tests from the 1950's through the 1990's as a method of quantifying ground patterns from aerial-retardant drops. During a drop test, drops are made at varying drop heights, drop speeds, flow rates, and volumes, and with different retardant materials to obtain a graphical and numerical picture of the ground patterns produced by the airtanker. Examining ground patterns provides information about the factors that influence the distribution of the drop. The report discusses the methods used to measure and describe ground patterns and proposes a spatial statistical method for increased efficiency and accuracy. Includes a glossary of technical terms.
Keywords: airtankers, coverage levels, drop tests, ground pattern, history, line length, rheology, spatial statistics, tank and gating systems
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