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How to Build a Propane Meter

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: BigGrib » Thu Dec 13, 2007 7:51 am

dude seriously if you don't know how a propane meter works you don't need to be using a propane meter.
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Yea, that's definitely going to get you at least a tazer.

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Unread postAuthor: MetalMSTR » Thu Dec 13, 2007 12:40 pm

open valve 1 let the gas fill the pipe,close valve 1,open valve 2 let the gas run to the comb chamber,close valve2, turn on the chamber fan,...fire!!! :twisted:
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Unread postAuthor: Spitfire » Fri Dec 14, 2007 9:39 am

jaja i figured that one out im not that stupid. I meant how do you know you putting in the optimum ammount?
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Unread postAuthor: octane89 » Fri Dec 14, 2007 10:19 am

A gauge helps to tell the psi, and you need to calculate the amount of "fuel" needed. That will determine your meter pipe size.
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Unread postAuthor: MetalMSTR » Fri Dec 14, 2007 2:42 pm

that's the matter ...calculate
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Unread postAuthor: BigGrib » Fri Dec 14, 2007 4:08 pm

http://www.advancedspuds.com/SpudToolonline.htm

check this out it has a fuel meter calculator down toward the bottom
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Yea, that's definitely going to get you at least a tazer.

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Unread postAuthor: MetalMSTR » Sat Dec 15, 2007 12:12 pm

soo anyway i have no chamber fan and i didint find a pcfan that fix in a 4"to 2" reduction (something like 5cm)
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Unread postAuthor: jimmy101 » Sat Dec 15, 2007 2:07 pm

MetalMSTR wrote:soo anyway i have no chamber fan and i didint find a pcfan that fix in a 4"to 2" reduction (something like 5cm)

A little more detail and/or proper English would help.

Do you mean you have to get the fan to fit through the 2" part? Normally, the fan is installed via the cleanout plug at the gun's breech end.

What kinds of fans did you look for? Computers use two types; 3~4" muffin fans for circulating air in the case and 1~2" fans strapped to the CPU to keep it cool. Both types are brushless. The CPU fans will fit into/through a pretty small opening.

Both work fine. A larger fan is better for ventilating the chamber after a shot. A smaller fan might work better for getting a higher burn rate during firing. Both sizes of fans work well.
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Unread postAuthor: MetalMSTR » Mon Dec 17, 2007 3:52 pm

my canon have a 4" comchamber of 20"large and two reducions to 2" 1 for tne barrel and one for the treaded cap to fill wih propelant (this is the place where i want to put the fan)
proper english :lol: sorry i am mexican and have some mistakes
the samller fan i find was about 2.5"
what is a cleanout plug?
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Unread postAuthor: Maniac » Mon Dec 17, 2007 3:59 pm

this is a clean out cap Image
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Unread postAuthor: MetalMSTR » Mon Dec 17, 2007 4:38 pm

ah sorry my canon use one like that but is the red thing in the reducer of comb chamber but this is a polimex cap(similar)
now i know where goes the pc fan
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Unread postAuthor: Spitfire » Mon Jan 07, 2008 4:32 pm

sorry for the late reply. thanks for your help
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Unread postAuthor: Davedom6766 » Thu Mar 27, 2008 4:15 pm

If the video does not work you can always see it on youtube at
http://www.youtube.com/watch?v=SelKyVBaVkg
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Unread postAuthor: NatoHub » Fri Apr 11, 2008 5:31 pm

Are there any stores that I might be able to buy the propane tank adapter at? I'd rather not buy it online (BC-Arms).
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Unread postAuthor: DYI » Fri Apr 11, 2008 5:49 pm

Are there any stores that I might be able to buy the propane tank adapter at? I'd rather not buy it online (BC-Arms).


When you're looking for a place to buy something from a store near you, ask yourself this question: will the regular customers ever have any use for what I'm trying to find? In your case, the answer is no. Unless you can find a dedicated supplier nearby, your best bet is ordering online.

As blasphemous as it may be, you might be disappointed if you order things from BCarms; I ordered a stungun FOUR WEEKS AGO, and there's been no sign of it since. If you do, get something small (like a propane tank adapter) to make sure if you do get shafted, that you're not losing large amounts of money.
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