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Spray Spectrum Modifications Through Changes in Airspeed to Minimize Drift

Spray Spectrum Modifications Through Changes in Airspeed to Minimize Drift. Brad Fritz 1 , Bill Bagley 2 , Clint Hoffmann 1 , Yubin Lan 1 1 USDA-ARS Areawide Pest Management Research Unit Aerial Application Technology Research Group College Station, TX 2 Wilbur-Ellis. Background.

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Spray Spectrum Modifications Through Changes in Airspeed to Minimize Drift

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  1. Spray Spectrum Modifications Through Changes in Airspeed to Minimize Drift Brad Fritz1, Bill Bagley2, Clint Hoffmann1, Yubin Lan1 1USDA-ARS Areawide Pest Management Research Unit Aerial Application Technology Research Group College Station, TX 2Wilbur-Ellis

  2. Background • This work was a side project based on work looking at effects of changing airspeed on atomization on a number of spray solutions • The question arose “Can a small number of reduced airspeed passes significantly reduce the amount of off-target spray moving past a field edge?”

  3. Objectives • To characterize droplet size resulting from a decreased airspeed relative to a typical application speed and to model downwind movement to determine potential drift reduction.

  4. Study Protocol • Examined two airspeeds • 120 and 140 mph • Aircraft AT-402B • Spray Formulation • PowerMax (Monsanto Company, St. Louis, MO) at 1 quart/acre rate • Application Rate – 2 gpa • Nozzle • CP-11TT 4008 at 35 psi 0º deflection

  5. Setup • Nozzle and boom • 65% effective boom • Nozzle flowrate at 35 psi = 0.75 gpm • At 140 mph = 49 nozzles required for 2 gpa • Slowing to 120 mph with same setup = 2.35 gpa • Assuming the aircraft had a flow controller • Nozzle pressure would be reduced to 25 psi (0.64 gpm) • Results in 2 gpa

  6. Droplet Sizing Nozzle traverse location Sympatec HELOS Laser diffraction particle sizing instrument NOTE: Spray tunnel enclosure typically used not pictured for improved clarity.

  7. Droplet Size Data This data was used in AGDISP modeling

  8. Field Application Modeled 140 mph Pass Wind Direction 120 mph Pass Flight Direction

  9. Field Application Modeled 140 mph Pass Wind Direction 120 mph Pass Flight Direction

  10. Field Application Modeled 140 mph Pass Wind Direction 120 mph Pass Flight Direction

  11. Field Application Modeled 140 mph Pass Wind Direction 120 mph Pass Flight Direction

  12. Field Application Modeled 140 mph Pass Wind Direction 120 mph Pass Flight Direction

  13. Field Application Modeled 140 mph Pass Wind Direction 120 mph Pass Flight Direction

  14. Field Application Modeled 140 mph Pass Wind Direction 120 mph Pass Flight Direction

  15. AGDISP Modeling • 20 Total Passes • Inputs • Wind Speed – 5 mph • Temperature – 70º F • Evaporation no considered • 3 m release height • AT402B • Data Modeled • Deposition from 0 to 100 m • Airborne Portion at 100 feet

  16. Deposition

  17. Spray Remaining Airborne

  18. Conclusion • Easy Method for reducing controlling droplet size and reducing drift • About 2 to 3 lower speed passes optimal (for this scenario) • 6 to 10% reduction in drift • Very minimal additional time required • ~ additional 5 seconds per pass at 120 mph for a mile long swath

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