40 HARDI
®
NAVIGATOR 550M, 800M, 1000M CENTRIFUGAL OPERATOR'S MANUAL
Formula Method
1. Check your spraying speed. Measure a test strip of at least 200 feet
(300 feet is ideal). Travel the distance at the speed you plan on spraying
and record the time it takes to travel the distance. Read from the chart
or use the formula to fi nd your exact travel speed.
Travel Time (in seconds)
Speed in MPH 200 ft. 300 ft.
3.0 45 68
3.5 39 58
4.0 34 51
Formula: 4.5 30 45
distance (ft.) x 0.68
= MPH
5.0 27 41
seconds 6.0 23 34
7.0 19 29
7.5 18 27
8.0 17 26
9.0 15 23
2. Calculate the required nozzle output. Use either the nozzle wheel (if
nozzle spacing is 20 inches), or this formula:
Formula: Formula:
GPM =
GPA x MPH x W (in.)
GPM =
10 x 7 x 20
= .24 GPM
5940 5940
Note: W= • Nozzle spacing (in inches) for broadcast application.
• Row spacing (in inches) divided by number of nozzles
per row for drop nozzle application.
• Sprayed band width or swath width (in inches) for band
application divided by number of nozzles per band.
• Note that on the nozzle wheel, W = 20 inches.
3. Set correct pressure. Read the required pressure from the nozzle table
in the nozzle catalogue or nozzle wheel. With clean water in the tank
and line, turn on the sprayer and set the target pressure. Collect the
spray from one nozzle for one minute in a container. Adjust pressure
until you collect the precise GPM called for.
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