DRIFT CONTROL

The TVB has been tested and its drift-control and spray deposition demonstrated in the following trials:

  1. NASA Wallops Flight Center, Wallops Island, VA on Ayres Thrust S2R-800. 17 May 1982.
  2. Dow Chemical Company Drift Control Study, Horton Ranch, Tilden, TX. Trials conducted on Ag-Cat, Husky, Air Tractor Fixed Wing Aircraft and Bell 47G. 4-6 October 1982.
  3. NAAA/US Dept. of State Trial, Laurinburg, NC on Ayres Turbo-Thrush Fixed Wing Aircraft. 9-11 May 1983.

TVB® (THRU VALVE BOOM®) SYSTEM - TEST RESULTS

Downwind distances at which a given percentage of herbicide recovery can be attained when wind speed is at 4.5 mph and flight is 33 feet.

Aircraft

Spray System

Flight Speed (MPH)

Distances in Feet

90%

95%

99%
Bell 206
Microfoil (.060)
25
0
0
0*
Bell 206
Raindrop
50
16
39
250
Bell 47G
TVB
32
0
0
0**
Ag Cat
TVB
116
0
16
33
Air Tractor
TVB
105
16
33
110
* 99% of spray deposited in swath. ** 99.5% of spray deposited in swath.

Note: The deposition data from the TVB (Thru Valve Boom) spray drift test (Tilden, TX, 4-6 October 1982) have been analyzed using a ballistic spray drift model. The TV Boom was tested using various types of aircraft. The deposition data are plotted versus downwind distance for each. For each run, the median droplet diameter and standard deviation of a log-normal droplet size distribution were estimated from the deposition data. The deposition pattern was then was then corrected for wind speed and flight height so the spraying systems could be compared on an equal basis. The results of this analysis are above.

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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