4 ms·

There are means: https://patents.google.com/patent/US20180305004A1/en?oq=20180305004 https://patents.google.com/patent/US20180305004A1/en?oq=2018... Blade desi

There are means: https://patents.google.com/patent/US20180305004A1/en?oq=20180305004 https://patents.google.com/patent/US20180305004A1/en?oq=2018... Blade design can also contribute or reduce noise. Fully silent while providing sufficient lift seems impossible...but how long did it take to innovate to the bladeless electric fan?

robkop 6y ago
Isn't the bladeless electric fan just a ducted bladed fan?
- slavak 6y ago
  No, because "ducted fan" has a very specific meaning in aerodynamics. But yes, a bladeless electric fan isn't actually bladeless, the blades are just hidden inside the fan body. https://en.wikipedia.org/wiki/Ducted_fan https://en.wikipedia.org/wiki/Ducted_fan