the RAH-66 prototype had some crazy cooling shit and also had specially staggered rotors that were technically still in balance when spun but distributed the rotor noise over a wide spectrum. ie the energy was there just spread more white-noise-like. it was crazy quiet
Try this! Sounds like a good idea. You can still hear them though.https://twitter.com/id_aa_carmack/status/949394328438239232 …
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