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hybrid mixtures

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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hybrid mixtures

Unread postAuthor: bighead33 » Fri Feb 19, 2010 2:37 pm

i herd that for my hybrid cannon i am going to use 5x more air than i use propane. is that true
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Unread postAuthor: jimmy101 » Fri Feb 19, 2010 3:17 pm

No.

http://www.spudfiles.com/forums/hybrid- ... 13602.html

Basically, for a 5X hybrid you inject 5X as much fuel as for a standard (1X) combustion gun. You then pressurize with air to a bit more than 5 ATM. The link above gives more details.

For a propane powered gun there is always about 25 times more air than there is fuel.
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Unread postAuthor: CpTn_lAw » Fri Feb 19, 2010 3:26 pm

If you're asking yourself that question, maybe you should work a little more on the principles.
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Unread postAuthor: ramses » Fri Feb 19, 2010 4:43 pm

jimmy101 wrote: You then pressurize with air to a bit more than 5 ATM.


It is worth noting that this is absolute pressure, and that we have one ATM (14.7 PSI) all around us. This can be subtracted from the required air pressure.
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Unread postAuthor: jimmy101 » Fri Feb 19, 2010 5:06 pm

ramses wrote:
jimmy101 wrote: You then pressurize with air to a bit more than 5 ATM.


It is worth noting that this is absolute pressure, and that we have one ATM (14.7 PSI) all around us. This can be subtracted from the required air pressure.

Good catch. If your pressure gauge reads zero in air then you pressurize to 4 ATM (your gauge reads PSIG). If it reads 1 ATM in air then you pressurize to 5 ATM (your gauge reads PSIA). Gauges that read PSIG are far more common.
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