I am looking to carry a calibration object through 3D space with a drone. This involves attaching balls (beach ball, soft balls, etc) or hanging a rod with balls attached on each end to hang below the drone as it flies. My questions are really two. One, what kind of load can the drone effectively carry? Am I likely to exceed it with these types of attachments? Two, do I need to keep the objects limited in size, because the wind resistance on the wand will unbalance it's flight? Clearly, I would have to work hard to make sure the weight distribution of whatever I choose as the wand will be equally distributed with respect to the drone.