To minimize drift caused by wingtip and rotor vortices, what should the boom length not exceed?

Minimizing drift caused by wingtip and rotor vortices is crucial in aerial application to ensure the effective delivery of pesticides while reducing the risk of off-target movement. The correct guideline here states that the boom length should not exceed 75% of the wingspan. This is because a boom length that approaches or exceeds the wingspan can exacerbate the effects of vortices created by the aircraft's wings or rotors, increasing the potential for drift.

By keeping the boom length to 75% or less of the wingspan, the application can maintain effective and controlled distribution of the product while significantly lessening the turbulence and mixing that can occur at the edges of the wings or rotors. This setup allows for more stable flight characteristics and better precision in application, minimizing unintended consequences such as pesticide drift to surrounding areas.

In summary, adhering to this guideline allows for optimal performance of the aerial applicator while prioritizing safety and efficacy in the application of agricultural chemicals.