How fast?!
4 kilo multi rotor doing 60 mph with a gimbal capable of swinging a DSLR hanging off it. pull the other one its got bells on. any thing that size is not built for speed, totally the opposite its a camera platform, slow , steady and stable. Any thing capable of pulling that sort of speed is going to be a small racing "drone" probably in the sub 500 gram territory with around 4 minutes of run time per charge. Gonna be tricky to get one those from the ground into the line of flight of an airliner traveling at 200+mph.
....and what is the official definition of a drone anyway? Best official description seems to cover any remotely operated vehicle. so why are they only firing mashed up multi rotors. Where are all the planes, heli's, balloons etc?