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How to Build a 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: bigbob12345 » Fri Apr 11, 2008 7:25 pm

Ive always wondered if you could screw that out
Thanks for the info
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Unread postAuthor: JDP12 » Fri Apr 11, 2008 7:26 pm

yea, i've done it, but only to see what it looks like inside
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"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
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Unread postAuthor: NatoHub » Fri Apr 11, 2008 7:47 pm

I just took a pipe wrench to it and got the angled pipe off.

Thanks!

I'm going to copy this cannon, because of it's pure awesomeness:
http://www.spudfiles.com/forums/revamped-combustion-t9690.html
I'm going to change the color though.

My dad just told me he can get all of the pipe fittings (for the propane meter) from his work, so it looks like I'm actually going to go through with this.

This will be my 3rd cannon (I have one combustion, one pneumatic, but they're nothing special).

One last thing, I know this question has probably been asked 10,000 times, but what is a good barrel diameter and an easy-to-get ammo for that diameter that flies somewhat accurately/far?
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Unread postAuthor: STHORNE » Fri Apr 11, 2008 7:50 pm

2" barrel

ammo:
golf balls
C/D batteries with tape
spuds
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Unread postAuthor: starman » Fri Apr 11, 2008 8:01 pm

DYI wrote:I accomplished this in under one minute. The pink stuff is some sort of glue that was on the threads, but it didn't stand much of a chance against a 12" pipe wrench. You can tell when the glue is broken when you hear a snap.

Those threads are the same as threads on a 1/4" compression fitting, and will seal as long as you use a sealant compound.


Thank you DYI for that bit of illumination!! I just now unscrewed one of those myself upon reading this. Even with long good-gripping tools, I had to go eat an extra bowl of Wheaties to get that thing to break loose.... 8)

Mine was a little tougher because I had already sawed the angle off of the pipe and had only a 1" straight stub to grip onto.

Thanks again!
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Unread postAuthor: 88pathoffroad » Sun Oct 19, 2008 7:03 pm

FYI: Video link no longer works.
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Unread postAuthor: cowkiller » Sat Oct 25, 2008 5:09 pm

it would be greart if some one wrote a tech with pics and specs being the vid no longer works
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Unread postAuthor: clide » Sun Oct 26, 2008 2:08 pm

Here is the video
[youtube]http://www.youtube.com/watch?v=SelKyVBaVkg[/youtube]
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<a href="http://gbcannon.com" target="_blank"><img src="http://gbcannon.com/pics/misc/pixel.png" border="0"></a>latest update - debut of the cardapult

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Unread postAuthor: cowkiller » Tue Oct 28, 2008 11:46 am

sweet very good video
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Unread postAuthor: Spud Bud » Tue Feb 09, 2010 9:50 pm

Can I use a 1/2 in nipple and street elbow instead of the 1/4 fittings? This is the part that screws onto the chamber.
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Unread postAuthor: VirusX » Tue Mar 02, 2010 10:17 am

Spud Bud wrote:Can I use a 1/2 in nipple and street elbow instead of the 1/4 fittings? This is the part that screws onto the chamber.


Hey I've got the same question - does anybody know?
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I'm sorry, my English is not so good but I'll try my best!

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Unread postAuthor: Hubb » Tue Mar 02, 2010 10:27 am

It doesn't matter what size pipe or what type of fittings are used in a fuel meter. What matter's is the meter's volume in relation to the chamber. In fact, I used a 1/2" pipe nipple on my last combustion launcher.
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