My name is Stetson, I am an Agricultural Pilot. AKA crop duster. I am looking for some help to answer a few questions to improve the efficiency, productivity, and safety of my profession. I fly an aircraft 6-10 feet above the canopy of a crop and apply various crop protection products. My target speed is 145 MPH indicated airspeed. I have a pressurized spray system with booms that are dropped down below the trailing edge of my wing. I can adjust the PSI on my system. I would like to know, what PSI would I need to use to put my solution into the air so that the relative air flow around the droplets would be 0. So, if in a perfect conditions situation, I would want my droplets to fall straight down. So what PSI would propel my droplets at 145MPH.