In the Soviet sci-fi film "Napoleon-gas" (1925) they use radio-controlled flying drones for air warfare. Here is the timed link to this place in the film. I wonder if this is a pure sci-fi element or they already used something like this in 1925?

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It's sci-fi. The electronics technology required to miniaturise a radio control system (for a model that size) simply didn't exist. If you look at the size of the "control" unit the men are using, you get some idea of the scale of radio equipment of the time. The first practical radio controls for model aircraft would only appear once transistor technology was invented and even then the 'control' available to the pilot was very limited compared to the RC models of today.

Looking at the models, these appear to be 18 inches or so across. There's no obvious attachment between the propeller and (what I assume to be) the motor, slung underneath. There's what appears to be a radio antennae on the top but nothing which might be a radio. There are no moveable control surfaces, so there's no way of controlling the flight even if a radio control system was on the plane.

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    Note that while miniaturised drones depicted in the film are fictional, experiments in making full-size remotely controlled aircraft were already being made. Apparently, first successful unmanned flight of a radio-controlled airplane was made in 1924. Sep 24, 2020 at 10:17
  • @DanilaSmirnov: Miniaturization is the key here. Contemporary radio equipment was bulky. You might get away with a remote-controlled full-size plane (but you'd be limited to line-of-sight control because video was a pipe dream at that point). A mini-drone? No chance.
    – DevSolar
    Sep 24, 2020 at 10:30
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    @DevSolar I know. Just wanted to point out that there was some basis for the filmmakers' fantasy to build upon. Sep 24, 2020 at 10:48
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    A remotely controlled full sized plane is also a drone. Some of the top end military drones nowadays are of the size of a plane.
    – Pere
    Nov 15, 2020 at 21:38

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