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Can some one confirm this??

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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Can some one confirm this??

Unread postAuthor: cwazy1 » Sun Oct 21, 2007 1:07 am

So i am using burntlatke's fuel calc but im not 100% sure on how to use it. so i would love if someone could check my accuracy.

my chamber is 250 in cubed.
my propane meter pipe is 1/2" galvinized steel
my propane meter holding chamber is 12" including spaces/gaps
my percent of propane to air is 4.3%
I have standard apsi

when i plug all this in, i come up with a 45psi range for the propane in the meter.

can someone check this?? thanks!
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Unread postAuthor: Hubb » Sun Oct 21, 2007 2:03 am

I'm kind of confused. Is your meter pipe 12" long? If not, what is the meter's volume, or length?
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Unread postAuthor: cwazy1 » Sun Oct 21, 2007 2:47 am

yeah its 12" x 1/2"
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Unread postAuthor: Hubb » Sun Oct 21, 2007 3:34 am

Using the Fuel Tool, I came up with 67psi. Using the formula from the wiki, I got 64psi.
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Unread postAuthor: SpudBlaster15 » Sun Oct 21, 2007 11:50 am

You want to use 4.2% propane to create a stoichiometric ratio.

(250*0.043)/((((0.62/2)^2)*pi)*12)*14.7 = 43.6PSIG
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Unread postAuthor: cwazy1 » Sun Oct 21, 2007 12:10 pm

yeah see, we get a mix of answers, i used fuel tool and it gave me 45-ish, and i tried some other one and it gave me around the 70-ish range.


EDIT: Hub, i think that yours is inaccurate due to the fact that when you plugged in the meter pipe ID, 1/2" steel pipe is not 1/2" IDmore like .7"
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Unread postAuthor: SpudBlaster15 » Sun Oct 21, 2007 12:31 pm

1/2" galvanized steel pipe has an approximate inside diameter of 0.62".

As far as the mixed answers...

SpudBlaster15 wrote:(250*0.043)/((((0.62/2)^2)*pi)*12)*14.7 = 43.6PSIG


...you can't argue with gas laws. :wink:
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Unread postAuthor: cwazy1 » Sun Oct 21, 2007 12:36 pm

hahah yup, so im gonna go try 43psi now. k thx
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