You would definitely hear it at 100ft and 100mph. I race drones and they are LOU... | Hacker News

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		joshmlewis on June 24, 2021 \| parent \| context \| favorite \| on: Tucson copter cop says mysterious, ‘sophisticated’... You would definitely hear it at 100ft and 100mph. I race drones and they are LOUD. If it's some DoD tech then maybe they figured out how to make it near silent but it'd have to be some real state of the art prop design.

pillefitz on June 24, 2021 [–]

Not every drone is a quadcopter, could have had wings of some kind (?)

qeternity on June 24, 2021 | [–]

It’s the electric motors that are loud. Fixed wing still suffer from that, though not as loud.

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