DROPLET SIZE (HELICOPTER)

Helicopter applications for forest and right-of-way vegetation management with the TVB® System are usually made with TVB® "wedge" nozzles. These nozzles are available in commercial orifice sizes of .030" and .045" and an experimental orifice size of .019". Droplet sizes and volumes produced by these nozzles in static tests are given below:

Nozzle Orifice
(inches)
Droplet Size
(micrometers)
Gal/Minute (30 psi)
(no restrictions)
.019
.030
.045
900
1500
2200
21.2
42.8
105.5*
*39.5 Gal/Min with .080" Control Orifice

Applying a 70' swath at 45 mph, the .019" nozzle will apply approximately 3 Gal/Acre, the .030" nozzle 7 Gal/Acre, and the .045" nozzle with control orifices 6 Gal/Acre (16 Gal/Acre without Control Orifices.)

Close-up of uniform droplets forming in the smooth air behind the TVB®.

Droplet formation from TVB® on a helicopter showing straight streams which break up into uniform-sized spherical droplets.

Below is a list of the topics for the Thru Valve Boom. Click on the one you want or simply press the "NEXT" button to see them in order. "Home" returns you to the Waldrum Specialties home page.
INTRODUCTION
CALIBRATION
ALTITUDE
SWATH WIDTH
NOZZLES, DROPLET SIZE & SPRAY VOLUME
AIRCRAFT CHOICES
FORMULATIONS
INSTALLATION & MAINTENANCE
DROPLET SIZE (Helicopter)
SPRAY DEPOSITION (Helicopter)
DROPLET PATTERN (Fixed-Wing)
DEPOSITION
(Fixed-Wing)
DRIFT CONTROL
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