More spray will be deposited to the left of the centerline of flight due to what phenomenon in fixed wing aircraft?

In fixed-wing aircraft, the phenomenon that causes more spray to be deposited to the left of the centerline of flight is primarily due to the clockwise rotation of the propeller. As the propeller revolves, it generates a spiral flow of air that creates a difference in the aerodynamic effects experienced on either side of the aircraft. Specifically, the downwash of air from the propeller tends to cause more spray to be directed to the left side.

This is particularly noticeable during aerial application because the flow pattern influenced by the rotating propeller results in uneven spray distribution. The left side experiences a bit more turbulence and a downward flow from the rotating blades, which can cause the pesticide to be deposited more heavily there, especially when the aircraft is flying at lower altitudes.

While other factors like weather inversion and wingtip vortices can influence flight and dispersion patterns, they do not specifically account for the uneven spray deposition to the left of the centerline in the same direct manner as the propeller's rotation. Hence, the clockwise rotation of the propeller is the primary reason for the increased spray on one side.