Hear the difference geometry makes.
Aureo’s patented (19/545,577) noise reduction isn’t a filter, an absorber, or active cancellation. The core idea is a design rule for multi-rotor aircraft: assign different Lucas-number blade counts (3, 4, 7, 11, …) to different rotors so no two rotors share a blade-passing frequency. When the BPFs don’t share harmonics, the acoustic fields of N rotors stop adding coherently (power ∝ N²) and start adding incoherently (power ∝ N). On a six-rotor eVTOL that’s a 7.8 dB recovery. On a twelve-rotor, 10.8 dB. The underlying wave physics is established — what’s new is the systematic rule that makes it applicable across a distributed propulsion system.
Within each rotor, the same mathematics applies at a smaller scale: placing blades at golden-angle intervals (137.508°) — the angle nature uses to pack sunflower seeds without gaps or clusters — turns the periodic pulse train that produces a dominant BPF tone into an aperiodic one that spreads the energy across a broadband spectrum.
First question every rotor engineer asks: doesn’t asymmetric blade spacing unbalance the rotor? Acoustic decoherence and rotor balance are independent design problems. The acoustic benefit lives in the timing of each blade’s pulse at the observer — a function of blade angle, not of mass distribution around the hub. Standard hub counterweighting handles balance, the way every modulated-spacing propeller in aerospace has been built for decades.
Within a single rotor. Watch equal-spaced blades rearrange at the golden angle. See the acoustic spectrum spread from a dominant tone into a broadband whoosh.
The eVTOL breakthrough. Assigning different Lucas-number blade counts across rotors eliminates the N² coherent reinforcement penalty — recovering 7.8 dB on a six-rotor aircraft and 10.8 dB on a twelve-rotor, without touching blade aerodynamics.
The design rule applied to a real cargo-drone configuration. See where the acoustic energy goes — and where it stops going.
Same power. Same blade count. Toggle between equal-spaced and Aureo-optimized and hear the difference yourself, against the same ambient backdrop.
One you can’t ignore. One you can.
Try it below ↓