The flow rate is the amount dispersed in gallons divided by the time in
(2) To derive the application rate, divide the flow rate by the swath width
and speed factors as follows.
Flow Rate (gal/min)
Application Rate =
.002 x swath (ft) x speed (mph)
(3) As noted above, increase windmill blade angle position to decrease
application rate or decrease blade angle to increase application rate and
Increase or decrease number of nozzles to fulfill
requirements if blade angle does not remain within the 1.0 to 2.0 range.
Where variations in flight height become necessary, there will of course be a change in swath width.
determine new nozzle configurations to meet the new flow rate as a direct result of changes in swath width and also
forward speed, a calculation procedure is useful. The following example is defined to establish the calculation procedure:
(1) Establish the rate of application required in gallons per acre. (1.0
gallon per acre is assumed in this example).
(2) Select a forward speed and swath width appropriate for the
applicating conditions. (100 miles per hour for a speed and 300 feet for
swath width is assumed for this procedure).