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Measureed VS Metered Propane (obviously in Hybrid)

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Measureed VS Metered Propane (obviously in Hybrid)

Unread postAuthor: shiftyguy » Fri Mar 28, 2008 8:39 am

I am making a new Hybrid and i am going to use Measured propane with a Low pressure gauge, since if you add propane into a sealed chamber the pressure is bound to increase. and by knowing the mix ratios, you can come up with comprehensive measurement system.

Has anyone measured there propane this way? It removes ball valves and whatnot.

Below is a chart i made of mix ratios:

Air Fuel Mixtures Propane
MIX Prop PSI Air PSI Prop PSI Air PSI
1 1.06 14.70 1 13.82
2 2.13 29.40 2 27.63
3 3.19 44.10 3 41.45
4 4.26 58.80 4 55.26
5 5.32 73.50 5 69.08
6 6.38 88.20 6 82.89
7 7.45 102.90 7 96.71
8 8.51 117.60 8 110.53
9 9.58 132.30 9 124.34
10 10.64 147.00 10 138.16

Anyone have any thoughts?
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Unread postAuthor: shiftyguy » Fri Mar 28, 2008 8:43 am

The chart did not display well
i have an attached jpg
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Unread postAuthor: Jared Haehnel » Fri Mar 28, 2008 8:48 am

I'm not sure if I understand you correctly and the chart is a bit hard on the eyes....

The very little amount of propane your adding to the chamber doesn't increase chamber pressure by that much. It won't change your ratio any...

Edit you edited it before I had posted...the chart is much better now 8)
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Unread postAuthor: DYI » Fri Mar 28, 2008 6:36 pm

The pressures you calculated are completely inaccurate; each "x" adds 0.686 psi propane, as was debated at great length between me and SB15.

How exactly did you calculate these pressures?
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Unread postAuthor: shiftyguy » Thu Apr 03, 2008 8:59 am

I am not measuring my mixture based on Atmospheric pressure "x" I am basing my measurement on Measured Propane Pressure and then adding an approperate amount of Compressed air.
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Unread postAuthor: shiftyguy » Thu Apr 03, 2008 9:04 am

I gathered my information from SpudBlaster15 discussion on "Fuling Hybrid 101"
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