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Chamber Fan

A place to ask general spud cannon related questions.
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Chamber Fan

Unread postAuthor: PCGUY » Sat Feb 26, 2005 9:18 pm

<div align="center">CHAMBER FAN

Provided By Boogieman - <a href="http://www.advancedspuds.com/">http://www.advancedspuds.com/</a>

A chamber fan is a good addition to any spud gun. The purpose of a chamber fan is to provide a better fuel mixture inside of the combustion chamber. If you have ever used a spud gun in cold weather, you may have noticed a decrease in performance. This is due to the fact that the fuel (in my case propane) molecules do not move as fast when cold. As a result the fuel doesn't mix very well. A chamber fan is also useful to help vent out your chamber between shots. This characteristic works especially well with breech loading potato guns.

Below are some pictures of my chamber fan, as well as a wiring diagram of my setup. The fan is a 12v computer case fan, which can be easily salvaged from an old junk computer or bought cheaply from a computer store, Radio shack, or online. I will note that even though the fan is rated for 12v, I use a 9V battery and it functions nicely. The led light is not necessary, but is a cool little addition for a dollar or so more. If you do wire the led light in note it must be wired as a separate circuit, and cannot be wired inline, as a switch would be.

<img src="http://www.spudfiles.com/official_pics/SMALLchamberfaniso.jpg">

<img src="http://www.spudfiles.com/official_pics/SMALLchamberfanstungun.jpg">

<img src="http://www.spudfiles.com/official_pics/SMALLchamberfanled.jpg">

Parts:

1. 12V computer fan

2. 2 10-24 screws

3. 4 10-24 nuts

4. A momentary switch (sends current through when you push it down)

5. LED light (rated for up to 12V)

6. Wire

7. 9V battery connector

8. 9V battery

9. Not shown, but I mounted the battery, LED, and switch inside of a “project box” made for homemade circuits.

All of these parts are easily found at any Radio Shack store and should only run you approximately $10-$15.

<img src="http://www.spudfiles.com/official_pics/fan.jpg">

Provided By Boogieman - <a href="http://www.advancedspuds.com/">http://www.advancedspuds.com/</a></div>
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Last edited by PCGUY on Sat Jul 29, 2006 1:32 am, edited 1 time in total.
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Unread postAuthor: waitandbleed » Mon Apr 18, 2005 1:38 am

Would the combustion kill the fan though?
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Unread postAuthor: iamthewalrus » Mon Apr 18, 2005 12:03 pm

no, the actual explosion only lasts about a millisecond, not enough to do anything, thats y u can make paintball combustions too.
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Unread postAuthor: CS » Mon Apr 18, 2005 5:49 pm

I think walrus might be right about the millisecond thing but also the explosion creates all the same pressure throughout the camber. So the fan has equal pressure on all sides of the fan.
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playing with fire....

Unread postAuthor: Solar » Wed May 18, 2005 12:08 am

Unless those are ignitionless blowers similar to a bilge fan you are asking for a misfire from errant sparks.
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Unread postAuthor: spudshot » Wed May 18, 2005 3:32 am

not with a computer fan, they have brushless motors which dont conduct sparks, no one's reported having their cannon go off because they turned on the fan
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Unread postAuthor: No.Va » Wed May 18, 2005 9:00 am

i know its off topic but is that a taser you are using for your igniter? i've just made a cannon and im currently using a flint sparker screwed into my end cap, i want to later replace that with a spark igniter, but i can't seem to get a hold of a taser/stungun, any suggestings for what i could use? nice fan setup btw, thats what i was planning on doing once i get paid again, im broke.
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Unread postAuthor: spudshot » Wed May 18, 2005 11:57 am

you could use just a peizo bbq ignitor
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Unread postAuthor: No.Va » Wed May 18, 2005 11:01 pm

oh really? i never knew that would be strong enough. ill try that
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Unread postAuthor: TatorBomber » Mon Oct 17, 2005 3:51 pm

BBQ Igniters are the most common igniters on combustion cannons. I just ordered a stun gun for my 50 inch cannon.
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Unread postAuthor: Ballad_Black » Thu Oct 20, 2005 12:03 pm

If you can't buy a stung gun, you can make one, just look up the old camera taser trick. You canf ind it here, but theres a video on how to do it on getoffmynuts.com. Im serious, thats really the site name.
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