Outboard nozzles should be placed at what percentage of the wingspan to increase the effective width of the aircraft?

Placing outboard nozzles at 75 percent of the wingspan is considered optimal for increasing the effective width of the aircraft’s spray coverage. This position maximizes the overlap between the spray patterns, ensuring a more uniform application across a wider area.

By deploying the nozzles further out on the wings, the aircraft can achieve a more efficient and effective dispersal of the pesticide, reducing gaps in coverage and minimizing the chance of double application in any one area. Additionally, this arrangement allows for better aerodynamics, as the spray is discharged at an angle that enhances drift control and allows for better handling of the aircraft, especially in variable wind conditions.

In contrast, less optimal percentages like 50, 60, or 70 percent do not provide the same level of coverage and could lead to inefficiencies in application, such as insufficient overlap and potential under-treatment of the target area. Thus, positioning the nozzles at 75 percent of the wingspan is a well-established practice in aerial application to ensure effectiveness and efficiency.