Drones are noisy, so Nasa wants to shut them up
A prototype drone being tested by Nasa comes equipped with ten different engines in an attempt to make the technology's trademark buzz a little quieter.
You'd imagine that more engines would make a drone noisier, but Nasa is working on the principle that multiple small motors are quieter than a few large ones. Each operates at a slightly different speed, which stops the sounds combining into one loud noise.
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