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Stacking fans? - Page 2

post #11 of 15
I think the stacking idea and contra-rotating fins works around the same concept as some helicopters with fewer blades per rotor, and rotating in different directions. I'd approached this quite some time ago and the challenge was that you couldn't just take a blade designed to spin one direction and reverse its rotation- you needed to have it designed to turn in the opposite direction... Even just having conventional fins on two stacked fans counter rotating would likely just work against each other- whereas a suitably designed fan with fewer high torque contra-rotating blades designed for this would have an exponentially greater effect.

I still believe the concept could work but I'm not sure if it would work so much better as to be worth the investment in research and development.
Edited by Eno75 - 2/8/11 at 8:32pm
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post #12 of 15
you'd figure some fan companies oughta make both clockwise and counterclockwise fans for this very purpose.
post #13 of 15
Delta made a few 120mm fans with two counter-rotating fans in it. But those are meant for industrial applications and are hard to find in the states. Maybe someone want to go get one and rig one up?
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post #14 of 15
Thread Starter 
Thnx guys, basically answered my question. If I find a clockwise spinning fan, I will definately post a link up!
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post #15 of 15
The delta ghb series had a pair of fans that counter-rotated. 120x76mm (i have 4 of them) Airflow for noise is pretty good, but the static pressure wasn't that high (a few more dB-like 3dB) got you way more static pressure (afb series, afb1212ghe).
As you can tell fan noise doesn't bother me that much the ghb series hum from the 2 fans is out of pitch tho
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