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Pnematic Venting Idea

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: risto » Fri Mar 16, 2007 11:59 pm

i'll just go cut myself now...
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Unread postAuthor: SpudBlaster15 » Sat Mar 17, 2007 12:37 pm

benstern wrote:If you increase the oxygen content in the gases but into the chamber you must also increase the amount of propane put in the chamber. However now it is considered a hybrid, now isn't it?


Filling the chamber with pure oxygen, then injecting a 4.03% shot of propane will result in a theoretically identical energy output, and a slightly faster burn rate when compared to a chamber filled with atmospheric air and 4.03% propane.
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Unread postAuthor: jjjd » Sat Mar 17, 2007 12:57 pm

Ok, can you people read, I am going to be using a canister of air, oxygen, or whatever to fill a second chamber. I want this to push out the exaust, i could care less if it makes a better burn rate. Ignore the canister idea for now, i just wanted to do that to make it easyr to use, without having to pump it up or have a compresor with me. The fan will still be there to mix but have nothing to do with venting
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Unread postAuthor: frankrede » Sat Mar 17, 2007 1:02 pm

jjjd wrote:Ok, can you people read, I am going to be using a canister of air, oxygen, or whatever to fill a second chamber. I want this to push out the exaust, i could care less if it makes a better burn rate. Ignore the canister idea for now, i just wanted to do that to make it easyr to use, without having to pump it up or have a compresor with me. The fan will still be there to mix but have nothing to do with venting
The idea is stupid if I say. expensive and takes the portability away from combustions.
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Unread postAuthor: Scope » Sat Mar 17, 2007 1:28 pm

ofcourse because you are increasing the o2 levels... atmospheric air is only 18.8 (right?)% o2. by injecting more o2 your replacing alot of the N2 in the air (80ish percent right?) with more o2 this means you can add more propane without increasing pressure like a hybrid... if you add more propane with atmospheric air you will not burn all of it because you need more o2 to burn the rest. by injecting the o2 you are replacing alot of the useless gasses n2 and w.e else if just floating around with pure o2.. because your not vacuming hte chamber and injecting it with o2 its not gunna be like 95% oxygen and 5 propane but you will get more oxygen letting you add more propane


i also thing that this is safe... propane generaly only generate 60psi peak in the best conditions (right? sorry im taking this from memory). that leaves about 90 psi more room to get to the max pressure that use pneumatic guys take our sch40s up to (150). that means you need to get 250% the amount of combustion... correct me if im wrong but if metered propane gives you 100% optimum so you would have to double that to even get close to dangerous
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Unread postAuthor: jjjd » Sat Mar 17, 2007 4:24 pm

frankrede wrote:
jjjd wrote:Ok, can you people read, I am going to be using a canister of air, oxygen, or whatever to fill a second chamber. I want this to push out the exaust, i could care less if it makes a better burn rate. Ignore the canister idea for now, i just wanted to do that to make it easyr to use, without having to pump it up or have a compresor with me. The fan will still be there to mix but have nothing to do with venting
The idea is stupid if I say. expensive and takes the portability away from combustions.


How in any way does it take away from the protability... CANISTER, not compresor, this is the idea

And scope, i know what you mean to displace the exaust with oxygen to make, basicaly "air", im not shure how much i would have to add. does anyone know the oxygen volume of air to inert gases?
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Unread postAuthor: frankrede » Sat Mar 17, 2007 4:48 pm

It requires you to get oxygen filled and bought.
And its expensive.
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Unread postAuthor: SpudBlaster15 » Sat Mar 17, 2007 5:12 pm

Atmospheric air is approximately 21% oxygen. How large is your chamber? Based on some quick gas law calculations, I found that one of those small $10 disposable oxygen cylinders would fill a 250ci chamber to 21% roughly 30 times. Not worth it in my mind, when a fan is so cheap and simple.
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Unread postAuthor: jjjd » Sat Mar 17, 2007 5:19 pm

do you know what preasue those tanks sit at?, and i doubt ill have a 250ci, probably around 200, mabey 150.

Thanks, Andrew
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Unread postAuthor: benstern » Sat Mar 17, 2007 5:58 pm

It is still going to be uneconomical and extremely inconvenient.
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Unread postAuthor: crazyfreak0075 » Sun Mar 18, 2007 4:09 pm

OMG lets stop with this it has more negatives then positive I wouldnt even attempt it.
I see where you are comming from though.
WOOT WOOT, 100 posts. :D
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Unread postAuthor: LGM » Sun Mar 18, 2007 4:55 pm

Just get the fan.
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