What is the recommended boom length to minimize drift effectively?

The recommended boom length to minimize drift effectively is typically 75% of the wingspan. This specific proportion is favored because it allows for optimal coverage of the application area while reducing the potential for pesticide drift caused by wind. A boom that is too short may not adequately cover the intended area, leading to over-application in some spots and under-application in others. Conversely, a boom that is too long can increase the likelihood of drift since the tips may extend too far from the aircraft, causing the spray to be more susceptible to wind influences.

By using 75% of the wingspan, the boom is positioned closer to the aircraft, allowing for better control of the spray patterns and minimizing the distance that droplets need to travel to reach the target area. This positioning helps to ensure that the spray remains consistent and effective, while also addressing environmental concerns related to drift that can affect non-target areas.

The other options, such as 50%, 100%, and 125% of the wingspan, either compromise coverage or increase the risk of drift, making them less desirable for effective aerial application.