APPENDIX
A
: Overview 73
APPENDIX A
AVOIDING SKIPS WITH
HAWKEYE NOZZLE CONTROL
SYSTEM
OVERVIEW
The Hawkeye nozzle control system is designed to pulse each spray tip using an alternating pattern across the
implement width. This alternating nozzle spray pattern relies upon an overlapping spray tip pattern and droplet
dispersion to achieve complete and even coverage during field applications.
RECOMMENDATIONS FOR HAWKEYE NOZZLE CONTROL OPERATION
Maintain the following application system conditions will help to ensure consistent, even coverage during field
applications using the Hawkeye nozzle control system:
1. Use the appropriate tip size for the desired droplet size, application speeds, target rates, and system pressures.
Refer to the tables in the Tip Selection and Application Speed Guide section on page 77.
2. Use wide-angle spray tips and appropriate spray tip height to achieve approximately 150% pattern overlap.
a. When using 80° spray tips:
• 20” spacing have a minimum spray tip height of 36” (91.4 cm)
• 15” spacing have a minimum spray tip height of 27” (68.6 cm)
• 10” spacing have a minimum spray tip height of 18” (45.7 cm)
b. When using 110° spray tips:
• 20” spacing have a minimum spray tip height of 21” (53.3 cm)
• 15” spacing have a minimum spray tip height of 16” (40.6 cm)
• 10” spacing have a minimum spray tip height of 10” (25.4 cm)
3. Maintain a system pressure sufficient to fully develop the intended tip spray pattern.
4. Avoid nozzle control valve duty cycles below 25%.
a. Stay within the displayed speed range for a selected tip size, application rate, and pressure.
b. Avoid application speeds in the bottom 1/3 of the recommended speed range.
c. Avoid target flow rates in the bottom 1/3 of the recommended application rate range for each spray tip.
d. When turn compensation is active, make gradual turns to avoid operating the NCV’s at their limits.
5. Target application speeds, tip sizes, and operating pressures so the NCV’s operate at approximately 70% +/-
10% duty cycle on average for the desired spray droplet size.
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