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Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: callenrain » Fri Oct 20, 2006 1:24 pm

my chamber fan has 3 wires, black, red , and yellow, how do I power it
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Unread postAuthor: beebs111 » Fri Oct 20, 2006 7:12 pm

test which wires will activate when you touch it to a 9 volt and wire accordingly, and wrong section
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Unread postAuthor: The Inventor » Fri Oct 20, 2006 11:18 pm

It is a brushless motor i would not bother unless you have an esc
[electronic speed control] and the space to sprae fr a reciever,battery and a radio.
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Unread postAuthor: jon2680 » Mon Nov 27, 2006 10:44 am

what voltage is it? ac or dc? ect
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Unread postAuthor: )DEMON( » Mon Nov 27, 2006 10:49 am

In other words you need to find the fan with two wires only, it will be 12 dc (in most cases). You can find the big ones in computer powersupply's. Just don't touch the capacitors.

There are smaller ones which have two wires only in older pc's on the CPU, for cooling it.
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Unread postAuthor: jon2680 » Mon Nov 27, 2006 2:37 pm

did some checking around, the fan may have two speeds or directions. Black should be negitive, red should be postive ( high speed or forwards )
yellow should be positive ( low speed or reverse ). Youll just have to try it too find out. Or you can search for the manufacture and look up the modle and find out for certin.
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Unread postAuthor: Alessandro » Mon Nov 27, 2006 4:00 pm

I'm assuming your camber fan comes from or was intended for use in a computer. Yes it is a brushless fan but the motor control circuit is located within the fan itself. You need only to supply power via the black and red wires. The yellow wire would have been used to calculate the fans speed by the computer, it sends out a pulse every time the fan does one full rotation. For these purposes it can be neglected entirely.
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Unread postAuthor: rna_duelers » Mon Nov 27, 2006 4:12 pm

Black for negative..Red for positive..Cut the yellow wire out,I have never had any problems with using my chamber fans like this.
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Unread postAuthor: sgort87 » Tue Nov 28, 2006 2:42 pm

The yellow wire is just the positive for the LEDs only so you can have the LEDs on without running the fan. The red wire is the positive for both the fan and the LEDs.
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Unread postAuthor: joannaardway » Wed Nov 29, 2006 3:30 am

I thought the yellow wire was a speed control of sorts, so the computer could control the fan's speed more precisely.

Whatever the use, you're unlikely to be needing it.
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Unread postAuthor: Pete Zaria » Wed Nov 29, 2006 4:01 am

Just FYI, the yellow (third) wire is for the speed sensor. Modern computer motherboards keep track of the fans RPMs and adjust them according to temperature. The yellow wire is the sensor.

I build/repair computers (and networks...) for a living.

You don't need the third (yellow) wire to use the fan in a spud gun; just cut it off. Your fan needs to be 9-12v DC, brushless. A 9v battery will power it, but a 9V and two AA's (in series) will power it better (making 12V). If your fan isn't the right kind, you can get one for around $3-5, including shipping. Look around.

Peace,
Pete Zaria.
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