Chiming in a bit late here...I'm new to drones, but I consider myself an expert on slinging loads. As a Navy H-46 crewchief, I have slung thousands of loads and millions of pounds of cargo. We called it Vertrep. The advantage was that we could move lots of cargo fast, as opposed landing each time and loading cargo into the helicopter. Aerodynamically our biggest worries wear the load swinging into the rotor arc, swinging loads changing the center of gravity, and how the power inputs affect the flight path of the load, The aerodynamics of the load was also affected by where we were in our flig