What issue do nozzles placed outboard of the 3/4 wingspan point contribute to?

Nozzles placed outboard of the 3/4 wingspan point contribute to drift problems primarily due to the increased distance from the aircraft's centerline. When the nozzles are positioned farther away from the fuselage, spray patterns can be influenced more by environmental factors, such as wind. This can lead to the unintended dispersal of chemicals away from the target area, resulting in drift. Managing drift is crucial in aerial application to ensure that materials reach their intended destination while minimizing off-target effects, which can lead to environmental issues and regulatory concerns.

In contrast, positioning nozzles at or closer to the aircraft's centerline tends to help maintain better control over the spray pattern and reduce susceptibility to wind effects, thereby promoting more accurate application.