Smithco Spray Star 1000 (sn 100199 – 100223) Parts & Service Manual - Manual (Page 90)

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Accessories
RA RAINDROP ® TIPS
This is a wide-angle (120°), hollow-cone, drift-reduction nozzle. Replaces conventional flooding nozzles in broad-
cast applications.
FEATURES:
• Color-coding makes it easy to match nozzle flow rates for easy identification.
• Color-coding is available in sizes 1 /
4
RA2 - 1 /
4
RA15.
• Uniform spray distribution.
• A large orifice opening and passages minimize clogging.
• The Raindrop nozzle’s patented design element, a secondary swirl chamber in the nozzle cap, alters the
swirling action of the liquid so that the fewer driftable lines are discharged from the secondary orifice.
• Maximum recommended pressure for Nylon is 100 psi (70 bar).
• Maximum recommended temperature is 120°F (50°C).
NOZZLE TILT
Delavan’s extensive research on spray patterns has proven that a tilt of about 45° for flood Nozzles or tips, RA
Raindrop
® and WRW Whirl-Rain ® nozzles will significantly improve the spray pattern uniformity.
The nozzle tilt reduces the effect of boom height variation and allows the spray nozzle to maintain a more fully
developed pattern even when the nozzle outlet is below the recommended height for the best spray pattern uni-
formity.
RECOMMENDED OVERLAP AND NOZZLE HEIGHT
100% overlap of spray pattern is recommended for RA Raindrop ® and WRW Whirl-Rain ® Nozzles for uniform
coverage. Nozzle height is determined by measuring the width of the spray pattern as it hits the ground. This
width should be 100% greater or twice as wide as the nozzle spacing. Adjust nozzle height until this is
achieved. If a decision to tilt the nozzle is made, do it before measuring the width of the spray on the ground and
adjusting nozzle height. See example below.
NOZZLE TYPE DROPLET SIZE COMPARISONS
(Volume median diameter in microns)
For Nozzles with a 0.5 gpm Output Spraying Pressure
20 psi 40 psi
RA Raindrop ® Drift Reduction Nozzle 810 810
LF Flat Fan Tip 510 400
D Flooding Tip 450 315
WRW Whirl-Rain ® Cone Spray Nozzle 350 2251
DRIFTABLE FINES PRODUCED
(0.5 gpm at 40 psi)
Nozzle Percent of Spray Volume
(.5 gpm Output) less than 200 microns
RA Raindrop ®
Drift Reduction Nozzle 0.7%
LF Flat Fan Tip 7-20%
(depending on spray angle)