This is a short video of an impromptu top speed test of my DJI Inspire 2 quadcopter w/ Zenmuse X5S Camera.
A speed test was not planned, and therefore ideal conditions were not present. Battery levels/altitude/wind varied between test runs. The second test run shows major movements at top speed but I believe I was moving the camera/gimbal and not the aircraft, although Im not sure.
I am sure that with ideal conditions/fresh batteries/good wind the Inspire 2 can break 80MPH while shooting professional quality footage. (this video is in H264, not ProRes or CineDNG). I may have to give it another try soon.
** Later tests using independent GPS have shown the DJI GoApp readings to be false/incorrect. Search YouTube to research.**