1930s early car ramp jump stunt - GIF

[Frank S]

My kidneys hurt just watching that... but something tells me it was an unmanned drone.

I believe you are correct if you look at the very top of the start ramp you can see some standing there it is only a brief glimpse as the gif starts with the car already nearly at the bottom of the starting ramp, Also if you look closely at the ramp and runway you can see a raised center proton this would indicate guiding rails.