A system having a drone and a payload frame connected to the drone, wherein the payload frame includes a mechanism for attaching at least one payload module to the payload frame and electrically coupling the at least one payload module to the payload frame. The electrical coupling includes a communication interface for communicating with a controller of the drone, and is configured to communicate a relative location of the at least one payload module in the payload frame, a weight of the at least one payload module and a volume of the at least one payload module. The controller of the drone is configured to calculate a weight distribution within the payload frame, based on the relative location of the at least one payload module, the weight of the at least one payload module and the volume of the at least one payload volume.