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computer fan

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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computer fan

Unread postAuthor: flamerz14 » Thu Nov 30, 2006 11:09 pm

im new to spudgunning and i heard that fans can help to increase perforamnce...how do i fit in a SQUARE computer fan into a CYLINDRYCAL pipe?? :shock: what size pipe do i need n is it nessacary to still put an end cap?
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Unread postAuthor: SpudBlaster15 » Thu Nov 30, 2006 11:27 pm

The method used to mount the fan depends on the size of the fan. Larger fans can be wedged into place, and they will not move. Smaller fans require mounts, something like this.

Image

Yes you will still require an endcap.
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Unread postAuthor: Pete Zaria » Thu Nov 30, 2006 11:31 pm

80mm Case fans (you need a brushless, 12v DC case-type fan) fit pretty well in 4" pipe. If you're using smaller pipe, you'll need to find a smaller fan - maybe an older CPU fan, or one off a graphics card. You can also modify the dollar-store type portable fans to work.

A 9v battery and two AA's in series provide 12v. A cheap radioshack on/off switch does the job for controlling it, though some people build circuits to automatically run the fan for 10-15 seconds. Search "fan controller circuit" for info on that.

Why would the fan affect the end cap...? Of course you still need one...

Make sure you tap all the holes in your cannon (such as the hole for the fan wires) where there are two layers of PVC/ABS (where a fitting and pipe overlap) and solvent weld all your joints properly.

Peace,
Pete Zaria.
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Unread postAuthor: flamerz14 » Thu Nov 30, 2006 11:41 pm

tks! :D shud d fan be blowing in or sucking out?


Larger fans can be wedged into place, and they will not move


wud it still move from the force of the shot?
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Unread postAuthor: SpudBlaster15 » Fri Dec 01, 2006 12:06 am

The fan should be blowing into the chamber, and no, a fan that is simply wedged into place will not be affected by the shot. However, I would suggest using a smaller fan if you plan to use aerosol propellants, as there is no room to spray around a large friction mounted fan.

I would suggest putting a nut and a washer on each screw that is threaded into the chamber, just for security.
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Unread postAuthor: flamerz14 » Fri Dec 01, 2006 2:29 am

so how do i mount the small fan?
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Unread postAuthor: MisterSteve124 » Fri Dec 01, 2006 5:31 pm

Look at the picture. You can put bolts into your chamber going through the fitting and the pipe so it is 2 layers. and you can just make some sort of bracket out of sheet metal or whatever. There isn't really a way that everyone does it you just improvise.
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