Appendix A Avoiding Skips With Hawkeye® 2 Nozzle Control System; Overview; Recommendations For Hawkeye® 2 Nozzle Control Operation - Raven RCM-Sprayer Hawkeye 2 Calibration And Operation Manual

APPENDIX
A

OVERVIEW

When added to the RCM - Sprayer control system, the Hawkeye® 2 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® 2 NOZZLE CONTROL OPERATION
Maintain the following application system conditions will help to ensure consistent, even coverage during field
applications using the Hawkeye® 2 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
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 NCV2s at their limits.
5. Target application speeds, tip sizes, and operating pressures so the NCV2s operate at approximately 70% ±
10% duty cycle on average for the desired spray droplet size.
FOR EXAMPLE:
Consistent and even field coverage should result under the following application conditions:
•
applicator with 20 inch [50.8 cm] NCV2 spacing
•
110° fan spray tips at 50 PSI [344.7 kPa]
•
application speed of 15 mph [24.1 kph]
•
spray tip height of 21 inches [53.3 cm]
: Overview
A VOIDING SKIPS WITH
A P P E N D I X A
HAWKEYE® 2 NOZZLE
CONTROL SYSTEM
Tip Selection and Application Speed Guide section on page 76.
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