TM 5-3740-218-13&PExample: An application calls for 10 gpa at 50 mph with a swath width of 90 feet. The operator puts 50 gallons of waterinto the hopper. How long should it take to spray this out?TIME/Load= 495x#Gal/Load=495x50# of Gal/Acre xSW x MPH10 x 90 x 500.55 Minutes x 60 = 33 SecondsAnswer: It should take 33 seconds to spray out 50 gallons.b.Swath Runs per Load Checks.This method is most commonly used by airplane operators. Before taking off witha load, calculations should be made to find out how many swath runs can be made on a field without running out ofchemical. The following formulas apply:Swath Runs/Load= AcreLoadinHopperAcres per Swath RunorSwath Runs/Load= AcreLoadinHopperx43560Field Length x Swath WidthExample: An operator wants to apply 10 gpa and the system carries 100 gallons, which means 10 acres in the hopper.The swath width is 90 feet and the field runs are 2,200 feet. How many passes can be made?Swath Runs/Load =AcreLoadinHopperx4356010x43560Field Length x Swath Width2200 x 90Answer: The operator can make two passes and should not attempt three without adjustments. See the Acre/SwathChart.c.PSI Setting. Although not commonly used as a means for accurate calibration, it should be mentioned as onemethod to aid in calibration. The formula for this method is:PSI= (GPA x MPH x SW Ft)2495 x# NOZ x GPM/NOZ at 30 PSIExample: An operator wants to apply 10 gpa at 100 mph with a swath width of 45 feet. The operator has 58 nozzles withD-7 orifices in them. What should the boom psi be? From the chart for nozzle selection, it is given that a D-7 puts out1.25 gpm/nozzle at 30 psi. Substituting for the above formula appears as follows:(10x100x45)2495 x 58 x 1.25(1.25)2 x 30 = 47.2 PSIAnswer: The psi should be adjusted to 47.2.G-3= 0.55 Minutes= 2.2 Swath RunsX 30X 30 = PSI
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