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need help with propane meter

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: Dornep » Sat Oct 06, 2007 6:55 pm

According to BurntLatke.com's fueltool you need to inject 57-58 PSI of propane into your meter.

Question... Are you still able to access your fan? If it's a small fan it might not move enough air to get a decent mix of fuel/air in such a large chamber..

If your open to trying another fan, I would recommend the personal fans from Wal-Mart. I just picked up 4 of these at a $1.67 USD a piece. Ive seen a few combustions which use these and they builders say they are great. I didn't believe it but these things ROCK! They will move your hair from 5ft away.
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Unread postAuthor: darknes » Sat Oct 06, 2007 8:47 pm

thanks for the psi number, and yes i can still access my fan and i will try to go and get one of those personal fans. but will they fit in my 2-1/2 in chambers? thanks
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Unread postAuthor: super spuder » Sat Oct 06, 2007 9:20 pm

WOW, that is a beasty cannon. Be sure to post that in the showcase :wink: hope you can get it going
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trying to decide on a new project, probably something small.
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Unread postAuthor: Dornep » Sat Oct 06, 2007 11:40 pm

Crap I forgot about the 2.5" pipe.. It will fit but you will probably have to trim the blade's by about half. I'm guessing that it will still be way more efficient at moving the propane throughout the chamber then a PC fan.

This is a thread that SB15 made about his camping fan.
http://www.spudfiles.com/forums/camping-fan-t5014.html

Markfh11q used one in his cannon too.
http://www.spudfiles.com/forums/last-bl ... t5121.html
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Unread postAuthor: jimmy101 » Sun Oct 07, 2007 11:08 am

So you've got a giant U-shaped chamber with the barrel attached at the "arch" of the U? Kind of like this when viewed from the top;
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I think you are going to have a heck of a time getting the fuel to mix. The chamber is just too long and skinny for the chamber fan to get the gases moving enough to mix well.

You might have to go to multiple fans and even multiple fuel injection points to get good performance from this setup.
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Unread postAuthor: psycix » Sun Oct 07, 2007 1:41 pm

With such a long chamber i would recommend multiple fans and at least 4 spark gaps.
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