Quote from: hotwired007 on August 09, 2013, 07:23:48 AM

Quote from: Trillium on August 08, 2013, 11:55:05 PM

Can I play the big fan game too? Shocked

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It needs to run off a car battery jump-starter (600 A peak current) because none of my bench PSU could handle it. It needs about 200 watts or more. Even my small desktop PC ATX PSUs were no match.

I made a bag thing out of a painters dropsheet to show how much air it moves.

http://www.youtube.com/watch?v=ihvaFVsB4G8

Have you tried the same experiment with just one of the fans? AFAIK the fact that there are 12 shouldnt be that much of an improvement due to teh first fan being the only fan that intakes air - how about thrying it with them paralell instead of in series Wink

I have 15 of these delta 120s - 252CFM - lovely for shifting air BUT too loud for continuos use (unless its in a server room) i have 12 pulling air in my server cab and 3 to 'play' with Wink

"Arranging fans in series - stacked on top of each other, so one blows straight into the other - gives no improvement in free-air performance, but doubles the pressure increase in a sealed box, and better and better performance compared to parallel fans as the system resistance gets higher and higher. Incidentally, this means that those goofy monster processor heatsinks with layered low-profile fans are a waste of money, since fans strapped onto a heatsink are very nearly in the free-air situation, and putting two layers of them there does close to nothing to the airflow." Source

So an array of fans next to each other would move much more air, but the static pressure would be far less (Would fill up the bag quicker, but the bag would be saggy), this is why the bag balloon too a bit to fill up, but then looked like it was about to burst