Abstract
Drift is one of the major concerns of aerial applicators. With increasing encroachment of urban areas into agricultural lands and more stringent regulatory conditions, aerial applicators must use new technologies to make applications more efficient. A spray boom system for aircraft was designed, constructed, and tested. The spray boom is lowered by 0.45 m (1.5 ft) and moved forward 0.37 m (1.2 ft) once the aircraft is in the air. The purpose of constructing the system was to increase the distance between the spray release point and the turbulence generated by the trailing edge of the wing. The system components created an additional drag force on the aircraft of 580 N (130 lb); however, no changes in aircraft performance were noticed. During in-wind swath analysis tests, the effective swath width was increased by 3.6%. A drift test was conducted to compare the drift from the spray system with the boom in the raised (original) versus lowered position. There was 25.9 and 55.9% less deposition at 10 m (32.8 ft) and 310 m (1017 ft) from the flightline, respectively, with the boom lowered.
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