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Camping 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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Camping fan

Unread postAuthor: SpudBlaster15 » Sun Dec 03, 2006 2:16 am

I saw this camping fan today at my local hardware store for 3 bucks, so I decided to pick it up and try to mount it in the chamber of my larger gun. I decided to test it out, so I installed 2 AA batteries and turned it on. The blast of air blew my hair back. This fan is very powerful for its size. After opening it up, it took about 3 seconds to figure out how to set it up to enable it to be switched on and off from outside the chamber. Here is the result.

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The batteries and switch are both located outside of the chamber, in the barrel support. I took the gun out and test fired it with the new fan and WOW, what a difference. My 50mm PC fan running on 12 volts is no comparison. Power increased dramatically. I suggest that everyones goes out and buys one of these fans, for 3 bucks and 20 minutes of work you can increase the power of your gun substantially.
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Unread postAuthor: Bluetooth » Sun Dec 03, 2006 7:54 am

I've seen someone on this forum use one of those before but, Im to lazy to find it.
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Unread postAuthor: mindtrickonu » Sun Dec 03, 2006 3:28 pm

how big is the chamber that's in? ... what fuel are you using? and (looking at the picture) is it blowing air toward you or down the barrel?
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Unread postAuthor: Bluetooth » Sun Dec 03, 2006 3:37 pm

Down the barrell unless he switched the wires going from the batteries to the motor.
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Unread postAuthor: SpudBlaster15 » Sun Dec 03, 2006 3:54 pm

mindtrickonu wrote:how big is the chamber that's in? ... what fuel are you using? and (looking at the picture) is it blowing air toward you or down the barrel?


The chamber is 4" in diameter and 16" long. I use starting fluid as fuel, and the fan is blowing air towards the barrel.
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Unread postAuthor: mindtrickonu » Sun Dec 03, 2006 4:35 pm

AWESOME .... cus thats nearly exactly what im using ... so when you say a great performance increase .... u mean 20 yards? or 100 yards increase?
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Unread postAuthor: MisterSteve124 » Sun Dec 03, 2006 5:01 pm

He means like 20 yards a fan will not give you +100 yards
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Unread postAuthor: SpudBlaster15 » Sun Dec 03, 2006 8:08 pm

I couldnt tell how much farther it flew as I was in my backyard. What I did notice, however, is how much faster it flew. Also, my already over chambered gun's noise output went from BANG to BANG!.
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Unread postAuthor: mindtrickonu » Mon Dec 04, 2006 6:45 pm

so im guessing the fan did a much better job of atomizing and mixing the gas in the chamber
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Unread postAuthor: mindtrickonu » Tue Dec 05, 2006 6:51 pm

ok so i have another question ... i went out and bought one ... cus i'd like to try it and they're cheap ... how did you mount it?
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Unread postAuthor: King_TaTer » Tue Dec 05, 2006 7:09 pm

it looks as if you mounted it on the rite way with the airflow exausting out the muzzle. if you didnt then do so, trust me its better. 8)
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Unread postAuthor: mindtrickonu » Tue Dec 05, 2006 8:53 pm

well .. lookgin at the picture ... thw two wires hanging down are for the fan? ..or for the spark ... and the screws are holding the fan up ... I DONT KNOW
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Unread postAuthor: SpudBlaster15 » Tue Dec 05, 2006 9:15 pm

Those wires that are hanging down act as mounts, and also supply current to the fan. They are solid steel and keep the fan mounted solidly. All you have to do is take apart the fan, drill 2 holes in the top, make the mounts out of steel wire, attach them to the fan housing with screws and nuts, and run wires from the motor's terminals to the posts. Drill 2 holes in your gun, and thread a screw through each hole. Use a nut to secure each mount post to the screws. On the outside of the gun, I ran 2 wires through a switch harness, to a pair of AA batteries wired in series. Simple and effective.
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Unread postAuthor: King_TaTer » Tue Dec 05, 2006 9:28 pm

indeed spudblaster, indeed
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Unread postAuthor: boilingleadbath » Tue Dec 05, 2006 10:37 pm

Latke showed that a chamber fan increased [his launcher's] muzzle energy ~40%, IIRC... and that was with a fairly ideal ratio. (I expect a bigger increase with a oversized chamber.)

This was with both propane and with starting fluid.
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