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Calculating propane pressure

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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Calculating propane pressure

Unread postAuthor: Sonicboom101 » Tue Jun 19, 2007 6:30 pm

Hey I just Got finished with my new propane potato gun and I need some help on calculating the pressure I Have a 6'' meter pipe and its 3/8'' wide i have a combustion chamber thats 4'' wide and 15'' long. Should I use a calculator or an equation I need some help! Thanks
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Unread postAuthor: spudthug » Tue Jun 19, 2007 7:01 pm

www.burntlatke.com

go to build then fueltool...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: SpudBlaster15 » Tue Jun 19, 2007 8:24 pm

First, do a fluid volume measurement on the meter by filling it with water, and recording how much water was required to fill the meter pipe. Now do the same to the chamber of the launcher. Once you have these numbers, multiply the chamber volume by 0.042. Dividing this number by your meter volume will give you the required meter pressure in atmospheres. Since 1 atmosphere = 14.7PSI, multiply the number that resulted from the last equation by 14.7 to obtain your meter pressure in PSIG.

This method is more accurate than using Burnt Latke's fuel tool.
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Unread postAuthor: FeLeX » Wed Jun 20, 2007 11:43 am

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