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Ukrainian Drones With Fibre-Optic Cables Have 41km Range
(www.technology.org)
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Funnily enough I have also worked with them, but all of mine were short lengths so I have absolutely no sense of scale for what kilometres of it looks like rolled up. Or had, I suppose, until now. I just used them to run light into awkward spots for sensors, though, so I wasn't exactly maxxing out the potential applications
By a neat coincidence I also play a bit of guitar, and a quarter millimetre is the diameter of the thinnest string on most of mine. For any other guitarists reading, a 10 gauge string is 0.254 mm
0.2mm is also a common layer height in 3D printing.