Lovellette, G. 2019. Ground pattern performance of the Air Tractor AT-802 with Hydromax fire gate. 1751 2802P. Missoula, MT: U.S. Department of Agriculture, Forest Service, National Technology and Development Program. 6 p.
This report describes the results of tests to determine the optimal ground pattern coverage of gum-thickened retardant dropped from the Air Tractor AT-802 with Hydromax fire gate. The results of drop tests allow managers to estimate the line length of the most effective coverage level required for a given fire intensity based on airspeed, drop height, and flow rate. Two graphs with contour lines at 0.5, 1, 2, 3, 4, 6, 8, and 10 gallons per 100 square feet compare the drop pattern characteristics for the Air Tractor AT-802 with Hydromax fire gate at two different flow rates but at similar drop heights and speeds. A table shows the coverage of fire-retarding material needed for specific fuel types and fire behavior. Another table lists the predicted line lengths, based on actual drop test measurements, of selected coverage levels.
Keywords: chemicals, drop guides, retardants, single engine airtanker, wildland fires, wild land fires, wildfires
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