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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: natas » Tue May 08, 2012 12:48 pm

To me it seems like u loose too much propane in the way u fill it.

inaccurate syringe filling, and maybe u get some ventilation of the chamber everytime u open the cap.

just for fun, try to doubble the amound of propane. it will ignite on 8% too, anyways it cant be worse than what u have now :-).

if this helps, and u get a bang when u doubble up, u probably loose too much propane.
if so, i would suggest getting a bigger syringe that can take everything in one filling, and a airtight tube from the propane to the syringe.
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Unread postAuthor: battlelava » Tue May 08, 2012 2:05 pm

What about a 1/4 hole threaded and use a bolt as a plug. What do yiu mean remove the orifice
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Unread postAuthor: DYI » Tue May 08, 2012 2:11 pm

What about a 1/4 hole threaded and use a bolt as a plug.


Yeah, I suppose you could do that too, as an interim solution. It would diminish usefulness in airsoft though, as it takes much longer to thread in a bolt than to close a ball valve. To that end, you should also install a fan immediately.


What do yiu mean remove the orifice


The orifice is the section of the torch head with the very small hole. Unscrew that section from the valve body - it's not doing you any good for filling syringes.
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Unread postAuthor: battlelava » Tue May 08, 2012 2:19 pm

To that end, you should also install a fan immediately.

Yep, I'm dying to get one, But i have to check were i can get one for really cheap (I'm broke, only got a euro coin left from my trip to italy)

The orifice is the section of the torch head with the very small hole. Unscrew that section from the valve body - it's not doing you any good for filling syringes.
Ill go try that right now
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Unread postAuthor: natas » Tue May 08, 2012 3:14 pm

actually... i think a euro is enough :-)
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Unread postAuthor: battlelava » Tue May 08, 2012 3:21 pm

natas wrote:actually... i think a euro is enough :-)

they only take us money by me
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Unread postAuthor: natas » Tue May 08, 2012 5:08 pm

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Unread postAuthor: battlelava » Tue May 08, 2012 5:34 pm


Dimensions: 2.36 in x 2.36 in x 0.59 in

seems like alot to reduce a fan by, Ill go to microcenter and get a 40-50mm fan.

http://www.microcenter.com/single_produ ... id=0253152
That one exactly
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Unread postAuthor: natas » Tue May 08, 2012 5:40 pm

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Unread postAuthor: battlelava » Tue May 08, 2012 5:41 pm



Or I can get it instore and have my gf buy it for me :D
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Unread postAuthor: jimmy101 » Tue May 08, 2012 10:18 pm

Another way to make an injection port is to just install a Schrader valve (fancy name for a car tire stem). If you have a needle for your syringe you permanently remove the stem from the tire valve. The syringe needle will fit through the stem-less valve (of course the "valve" is no longer a valve once the stem is removed). The plastic screw on cap for the stem is more than strong enough to contain the combustion pressures.

You can get a metal tire valve from a car tire shop for a buck or so.

Here is an example http://www.inpharmix.com/jps/Sluka_Spud-zooka.html
Another example, left end, upper part of the chamber, that's a chrome truck tire stem with metal cap that I inject fuel through using a syringe: Image

Or you can go totally ghetto. Drill a hole in the chamber just a hair bigger than the needle. Inject the fuel and cover the little hole with a piece of tape. Surprisingly, the tap will be just fine. (Just avoid putting a body part too close to the tape covered hole just in case. :P)


I suspect you have some problem in your math and that is messing up your fueling. The volume of a cylinder is pi*radius^2*length. Note that it is the radius, not the diameter, in the formula. Or just post the dimensions, internal diameter and length.
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Unread postAuthor: battlelava » Thu May 10, 2012 7:31 am

I actually have a schrader valve right here, was going to use in a pneumatic that never happened. I just have to find it on my desk.

I suspect you have some problem in your math and that is messing up your fueling. The volume of a cylinder is pi*radius^2*length. Note that it is the radius, not the diameter, in the formula. Or just post the dimensions, internal diameter and length.


From Jackssmirkingrevenge
First off , if you're using propane the correct percentage is 4.19%.

Chamber volume is 34.04 cubic inches, which gives us 557.8mL

If you started with metric it would have been 30.48cm x (4.83cm/2)2 x π, which is 557.8mL

I'm assuming your chamber is 1.9inch inner diameter, but we use the radius in the equation.

Correct propane volume to meter is therefore (4.19/100) x 557.8mL which gives us 23.4mL


Edit: Here it is Image
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Unread postAuthor: natas » Thu May 10, 2012 10:53 am

looks good, and for safety, remember to put it in where u have two layers of plastic :-)
now u only need the fan i guess :-)
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Unread postAuthor: battlelava » Thu May 10, 2012 2:44 pm

natas wrote:looks good, and for safety, remember to put it in where u have two layers of plastic :-)
now u only need the fan i guess :-)
I know about the double layer. And I just got a 10$ prepaid visa card to buy a fan with
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Unread postAuthor: natas » Thu May 10, 2012 2:57 pm

i predict some good explotions coming your way soon :-)
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