For fixed wing aerial applications, how should the spray boom be positioned relative to the trailing edge of the wing?

The correct positioning of the spray boom for fixed wing aerial applications is slightly below and behind the trailing edge of the wing. This configuration is crucial for several reasons.

When the spray boom is placed slightly below the wing, it allows for improved airflow around the boom and the application whether the aircraft is in level flight or maneuvering. This positioning helps to ensure that the spray particles are not affected too much by the downwash created by the wings, which can lead to better distribution and coverage of the agricultural products being applied.

Being slightly behind the wing's trailing edge helps in minimizing turbulence interference on the spray pattern. The ideal trajectory of the spray droplets aligns better with the natural airflow, enhancing the efficiency of the application process. Additionally, it aids in reducing the potential for drift caused by the aircraft's wake, which can occur if the spray is released directly below the wing.

The combination of these factors contributes to more effective aerial application, ensuring that the chemicals reach their intended target with minimal loss or unintended dispersion.