An ultra-quiet electric leaf blower, powered by aerospace tech
An ultra-quiet electric leaf blower, powered by aerospace tech

Whisper Aero unveils ultra-quiet electric leaf blower, powered by aerospace tech | TechCrunch

There is a discussion on Hacker News, but feel free to comment here as well.
Soooo...toroidal fan blades and something to dampen sound, like aerogel? Powered by "aerospace tech" is quite the marketing spin for something like this.
Either this is true or Cunningham's Law will take effect and we'll learn the right answer!