Set-up Calculations

Choosing Tips and Orifices

To determine which tips or orifices will best suit your applications, use the “Aircraft Calibration” spreadsheet.

Enter your airspeed, swath width, application rate and number of nozzles. Use either the English or Metric spaces for the entries. When the entries are made, the two righthand columns show pressure numbers . Choose set-ups which give pressures between 25 -60 psi—30-35 psi may be required for good boom dynamics. CP’s should be used with a minimum of 30 psi. The left-hand column shows tips and orifices. The first part of the spreadsheet shows flat fan tips. Scroll down to see orifices for either CP’s polypropylene or stainless steel bodies which meet the pressure minimums. For CP-03’s and CP -07/09’s, the left hand column may show “2/3 - .078/1/3-.125”, for instance. This simply means that, instead of using all one orifice, use 2/3 of the nozzles on the .078 orifice and 1/3 on the .125 orifice to achieve the correct flow rate at a workable pressure. A combination of flat fan tips sizes may be used, also, but are not calculated automatically.

Click here for “Aircraft Calibration”. To convert from knots per hour to miles per hour, use the Knots to MPH conversion calculator.

Once a selection of set-up options is determined, refer to the spray classification spreadsheets which calculate droplet spectrum. The final choice of set-up should give the flow rate needed with an appropriate droplet spectrum.