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Micro 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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Unread postAuthor: MS-310 » Thu Feb 07, 2008 1:14 pm

So where is this fan placed? In side the gun? If so wont the "fire" screw it up?
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Unread postAuthor: daberno123 » Thu Feb 07, 2008 1:51 pm

A fan inside the chamber has been shown to increase performance by up to 30%. It also helps in venting the chamber after a shot. The "fire" won't screw it up because the heat in the chamber doesn't stay there long enough to heat the fan up to its melting point.
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Unread postAuthor: MS-310 » Thu Feb 07, 2008 4:12 pm

So how does this all work, is there some pic's on how to make one with a propane injected gun? I only have made the hair spray type with the screaw on cap....Thanks alot
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Unread postAuthor: psycix » Fri Feb 08, 2008 7:28 am

MS-310 wrote:So how does this all work, is there some pic's on how to make one with a propane injected gun? I only have made the hair spray type with the screaw on cap....Thanks alot


Yes, you should find it right here if you want to be spoonfed
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Unread postAuthor: rcman50166 » Fri Feb 08, 2008 7:35 pm

I own the fan you're all talking about. If you still have measurement questions I'm sure I can answer them.
BTW psycix, he has a lot of general questions, look at his rank and post count. I'm sure all of us have asked these questions at one point or another.
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Unread postAuthor: elitesniper » Sun Feb 10, 2008 11:41 pm

hey rcman is fan any good? is it good venting and mixing? and wont break on you.
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Unread postAuthor: rcman50166 » Tue Feb 12, 2008 4:21 pm

The fan is just as good as a regular size fan with the exception of its size and flow rate. It is kinda easy to go over the specified limit but I think it would be fine on a nine volt. Plus it has a 90 day guarentee. (not sure if obliteration via potato cannon counts though. :lol: )
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Unread postAuthor: elitesniper » Tue Feb 12, 2008 6:06 pm

oh yeah witch way do i put it the side with the radioshack logo?
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Unread postAuthor: rcman50166 » Thu Feb 14, 2008 4:46 pm

It doesn't matter really. Just know that the side with the radio shack logo sucks air while the other side blows it.
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Unread postAuthor: jimmy101 » Fri Feb 15, 2008 12:08 pm

elitesniper wrote:oh yeah witch way do i put it the side with the radioshack logo?

Look closely at the fan, I'm sure it is marked which way the air flows. Usually, on the outside there is an arrow cast into the plastic.
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Unread postAuthor: psycix » Sun Feb 17, 2008 4:00 pm

jimmy101 wrote:
elitesniper wrote:oh yeah witch way do i put it the side with the radioshack logo?

Look closely at the fan, I'm sure it is marked which way the air flows. Usually, on the outside there is an arrow cast into the plastic.


Or just connect it to some power to find out what way it blows.
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Unread postAuthor: rcman50166 » Sun Feb 17, 2008 10:16 pm

That, lol, is probably the smartest and fastest way to find out. however I would be careful on how much power is used on the fan. It's really easy to blow micro solid state fans.
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Unread postAuthor: psycix » Mon Feb 18, 2008 5:31 pm

rcman50166 wrote:That, lol, is probably the smartest and fastest way to find out. however I would be careful on how much power is used on the fan. It's really easy to blow micro solid state fans.

99% of all fans use 12 volt
Just check the description on the fan to make sure.
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Unread postAuthor: BigGrib » Mon Feb 18, 2008 6:26 pm

Really how hard is it to figure this stuff out??? The fan, most likely on the motor will say how many volts, :idea: and come on does it need to blow in reverse to suck out the air after I fired it...really?? I guess the saying is right there is nothing common about common sense. :shock:
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Unread postAuthor: Jared Haehnel » Mon Feb 25, 2008 8:33 am

I have found CPUs fans work well in small 2 or three inch chambers. You'll have file down the corners. With the type of plastic the use for the case its pretty easy.

Once mounted inside the chamber I mounted a pressure switch on the grip so I could press it right before I pulled the trigger. It works almost every time. (I mine with duct tape and made it a tight fit. Doesn't take much)

I let the fan after every shot for a few seconds with the trap open to clear out the exhaust. Then I let the fan run when I introduce the fuel into the chamber.I also let the fan run right before each shot. Some time during the combustion.

It might be me, but I think leaving the fan going during combustion actually improve muzzle velocities. At least I get better distances when I do
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