What is the most effective method to change the output volume of an aircraft's spraying system?

Installing different sized orifices on nozzles is the most effective method to change the output volume of an aircraft's spraying system because it directly impacts the flow rate of the liquid being sprayed. Each nozzle orifice size has a specific flow rate that determines how much product is released over a period of time. By changing to a larger or smaller orifice, you can precisely control the volume of spray that is applied, allowing for adjustments based on the specific requirements of a job, such as the type of crop, the pest being targeted, or environmental conditions.

While adjusting the flight altitude can influence the effectiveness of the application by changing the droplet size and distribution, it does not directly change the volume of liquid being discharged. Changing engine RPM may affect the speed of the aircraft or pump pressure, but it is not the most reliable or direct way to alter the spray volume. Altering the spray pattern, on the other hand, is focused on how the liquid is distributed rather than how much is being applied. Therefore, the orifice size selection remains the most straightforward and effective method for controlling the output volume in aerial applicator operations.