Homebuilt fan

[araaraara]

Well, me with my nonexistent budget, decided that I needed some more cooling. So, I took a 6' fan blade I had laying around, stuck it on a big *** 12V motor and used some sheetmetal to build a shroud. then I stuck it in my case and pluged it in. This thing spins at over 10 000 rpm and it is like a mini hurricane in my case! It lowered my case temps to like 10C!

[greenlion]

Maybe you need to anchor it or it may fly off. http://www.sysopt.com/forum/smile.gif

[Gomer]

With a 6' blade that has to be a hell of a shroud.... sounds more like a wind tunnel =)

[Szech]

Nice! Got pics?

[MiKe85]

6' blade? I agree with Gomer..Sounds like a wind tunnel...
10C!?! Nice http://www.sysopt.com/forum/biggrin.gif

Mike

[randy48]

I'd like to see the case you put a 6 foot fan into http://www.sysopt.com/forum/wink.gif

[narayan]

Mee too. lol

[captpete]

Longer ago than I like to remember, several computers back, my fan died. Since the only thing I new about the computer at the time was the cover came off, I took same off and put my room fan beside her and went about my business. Workded fine until my next computer, about 6 months. I think the thing still works?

[Cygnus-X1]

It sounds like it would be kind of noisy?

[nunyadam]

ok sombody do the math
6 foot dia
10,000 rpm
how many miles an hour is the outside edge of the fan traveling?
can we figure out an average cfm?

i would'nt want to stand in front of the intake.

[Fingers]

Well, I don't know enough about the fan to figure CFM, but;

6' Dia. X 3.14 = 18.84'(circumference) X 10,000 rpm = 188,400 feet per minute = 35.68 miles per minute = 2,141 miles per hour = Mach 1.8 http://www.sysopt.com/forum/wink.gif

[greenlion]

heh heh heh, I'm sure he meant 6 inches blades and not six feet. http://www.sysopt.com/forum/smile.gif

[krusty the klown]

LOL, you'd be flayed http://www.sysopt.com/forum/wink.gif

On a more serious note - about the 12V motor: Is it a brush motor? Is it sealed or open? If it's open, then you don't want to run it permanently enclosed with circuit boards, as the particles of carbon shed from the brushes as they wear will deposit on the circuit boards and can cause conductive paths to form. I've seen a (stupidly) designed piece of equipment where a vented brush motor was inside a box with some circuit boards and the entire inside of the box was black with carbon!

This will take a long time and by the sounds of it, there's so much air flow that nothing is going to stick to the boards anyway http://www.sysopt.com/forum/smile.gif

[araaraara]

oops! I didn't push the shift key! The fan blade is only 6 inches (6") Sorry, no pics senor. No camera. (Like I could afford one. Maybe if I ever get REALLY bored I could build one)

[Tazbiker]

Reminds me of the time I was thinking of putting an old electic flymo on the top of my case http://www.sysopt.com/forum/smile.gif

[Joel Kleppinger]

One thing to be careful of with the motor is that it likely isn't sheilded. Lot's of stuff, esp. floppies, can have a real fun time around a running fan motor.

I used to run a desk fan to cool a dual system I had running for a while (Celeron 300A @ 527 paired with a P3 450 at the same clock speed). It did funky things with my monitor since the computer was up on the desk. http://www.sysopt.com/forum/smile.gif The Celeron/P3 pairing worked great until I installed Win2k. At that point, I just installed 2 C366s (neither of which would hit 550 reliably) and ran them at the default speed because the board wouldn't boot at 75 or 83 MHz... kinda weird because I thought it would.

Just yesterday, I finally decided to take my 3 C366s and figure out which 2 of the 3 of them were my best overclockers. I have one which is fairly stable at 550 @ 2.1v and my other "good" one will just POST at 550 @2.1. After tweaking it a bit, I set 2.2v on the slotket, installed my best 2 CPU fans, and then added the two fans blowing across the CPUs when the thing started crashing. It's a windtunnel/heater in its own right, and it sits about 2 feet away from my main computer. http://www.sysopt.com/forum/smile.gif
My current setup (http://www.churchchallenge.com/junk/dual-testbed.jpg) Warning: Image is 2048x and 1 MB http://www.sysopt.com/forum/smile.gif

[Blackjack1]

You got the makings of a good cooler, but what you really need is a 220V motor rather than measly one with only 12V. You could tie the motor leads directly to the transformer outside your house and bypass the electric meter. Not only would you cool your CPU, but your whole house too, thus saving on energy cost. Just use caution and don't wear any loose jewelry or clothing when you boot up.
I once knew a fellow that had a 6' box fan that was powered by belt driven 120VAC motor that he used for a window fan. He could crack all the windows in the house about 2" and the draft would suck the sheets off the beds. Imagine what you could do with 220V.

[Kruppt]

Ya, I remember getting carried away with cooling when I was overclocking a BE6-II with a 366a to 550mhz. I had three large fans already, then I cut a hole in the back topside of the case and installed a fan from a large microwave oven http://www.sysopt.com/forum/smile.gif. The noise got old after a while and I have since removed it and patched the hole.(Really did not need it in the first place, but you know how the cooling craze gets ya) But if you are short of change and need a small fan that really cranks, those microwave fans will do the trick. You need to build yourself a shroud out of PVC pipe or a smaller coffe can or something similar. Hey if you love racket and want a cool case, it will do the trick.