Suter, Ann . 2000. Ground Pattern Performance of the Griffith Big Dipper Model 100 Helibucket. 0057 2829. Missoula, MT: U.S. Department of Agriculture, Forest Service, National Technology and Development Program. 6 p.
Describes the results of tests to determine the optimal ground pattern coverage of gum-thickened retardant, foam, or water dropped from the Griffith Big Dipper Model 100 helibucket. Graphs with contour lines at 0.5, 1, 2, 3, 4, 6, 8, and 10 gallons per 100 square feet show the drop pattern characteristics for the Griffith Big Dipper Model 100 helibucket flying at drop heights of 42 to 85 feet and drop speeds of 40 to 60 knots. A table shows the coverage of fire-retarding material needed for specific fuel types and fire behavior. Matched tables and graphs allow managers to estimate the airspeed needed to produce the maximum length of line at the desired coverage when dropping gum-thickened retardant, foam, or water.
Keywords: aircraft, chemicals, drop guides, fire retardants, foam, helicopters, test reports, water
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