Why some drones make a buzzing sound

While I was watching a documentary about drone strikes in Afghanistan, I noticed that some of the drones shown made buzzing sounds. The sound they make is comparable to the noise of a lawnmower – in fact, when I looked into it, it turned out that some drones use motors that have similarities to the ones used in lawnmowers. At first I did not really notice but then I though, well that is odd, wouldn’t it be much better to have them as silent as possible? Well, they are somewhat advertised as the silent killers that could strike anywhere. Plus it shouldn’t be too difficult to make them silent.

But the more I think about it, the more do I come to the conclusion that the buzzing sound is not due to an accident or due to some technical limitations, rather that this sound is part of the way this weapon system is supposed to work. The noise serves as a constant reminder that the threat created by these drones is real and might strike you at any time. In a way I can see parallels to the footage produced by terror groups that show successful suicide attacks. Uploading a video to Youtube does not make your next suicide attack more successful, but by using this kind of PR channels, you are causing terror beyond the actual reach of your suicide attackers.

This is the aspect that fascinates me a lot, while thinking about how contemporary conflicts are fought. Many of the most prolific weapons used today try to be invisible – like suicide bombers, drones, IEDs, computer viruses -, but their reach is always limited. Therefore there seems the need for them to be as widely publicized as possible. That way they manage to enter our perception. The threat becomes omnipresent.

I think I mentioned this in an earlier blog post, but big brother might be happy if you think he is watching. He could never watch everyone, but once you feel his gaze, you might control yourself.


I wonder if sound designers are involved in the production of these drone engines. Do they ask people to respond to different kinds of pitches? Or do they consider, which wavelength might work best and could be heard farthest? Toying with peoples perception is as brutal as aiming weapons in their general direction.

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