Has anyone looked into the Dyson Air Multiplier concept? Moving air is, itself, silent. What we use to artificially move it, and what we move it through, is what makes the noise. Sit outside enjoying the breeze on a warm day, it's not the breeze you hear, but the rustling of leaves as it blows throu...

So I guess thres nowt more to consider on this line of thought, the ultimate expert has spoken and all is known that can be known about fan noise :lol: That means I should also ignore the howl made by the electric radiator fans in my car when they kick in, it must be noise made by the front wheel be...

8 blades in the upper photo was used for balancing, the 9 blade fan in the lower photo was the original concept, and yes i counted. I have a slow-running 9-blader here on my system casing on the intake side, and a higher revving 7-blade at the exhaust end. both run fairly quietly, altho i cant help ...

It's still worth considering rather than dismissing the concept outright...

Zipang, do you know the comparative RPM figures?

The Loco fans operate at a maximum of 1500 to 1800 RPM
Faster fans will make higher-pitched sounds because the pressure-pulse frequency will be higher. Ditto for the siren effect

I am totally surprised, that even in 2013, one MAJOR source of noise in computers has not been properly addressed, yet is so elementary FAN NOISE! EVERY fan used in computers, regardless of blade shap, or rotation speed, size, bearings have one thing in common: The blades are equally spaced around t...