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How do attach the propane injection with the chamber?

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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How do attach the propane injection with the chamber?

Unread postAuthor: VirusX » Tue Mar 02, 2010 11:32 am

Hey,

How do I connect the elbow of the propane injection (shown in the tutorial) with my chamber? I mean drilling a hole in the chamber can be negative for the performance and safety - if it's not done perfect. So how do you do that?

Do you drill a hole in the chamber, that's a little bit smaller than the elbow and then press the elbow in it? And do you use any glue like epoxy?

Thanks for your help! :)
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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: jrrdw » Tue Mar 02, 2010 11:37 am

Drill through double thickness, tap/cut threads in the hole, screw in threaded 90 degree elbow. You will need a pipe thread tap.
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Unread postAuthor: Hubb » Tue Mar 02, 2010 1:37 pm

I usually just make the hole a tiny bit smaller and thread the fitting into it to cut the threads. As far as sealing it goes, teflon tape is good, but I always use epoxy because I can't ever seem to get it exactly straight.
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Unread postAuthor: bighead33 » Thu Mar 04, 2010 11:19 am

THERES A TUTORIAL!!!
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Unread postAuthor: VirusX » Fri Mar 05, 2010 3:20 pm

bighead33 wrote:THERES A TUTORIAL!!!


Where is a tutorial!?
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Unread postAuthor: MrCrowley » Fri Mar 05, 2010 4:58 pm

VirusX wrote:
bighead33 wrote:THERES A TUTORIAL!!!


Where is a tutorial!?

Ignore bighead, he's being an ass.
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Unread postAuthor: VirusX » Fri Mar 05, 2010 7:05 pm

Hey, I've got another little question but I don't wanted to open a new thread.

I still want to build an advanced spud gun with a metered propane injection, just like this one: http://www.spudfiles.com/forums/the-beast-propane-bazooka-t13644.html

Is that a "Regular Combustion" or a "Hybrid Launcher"? I could't really image the difference form the Wiki.

I'm asking because I don't know which pipes to pick? ABS or PVC-U can stand ~135psi, so much more than it's possible with a regular combustion - but for a hybrid launcher it would be way to little.
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Unread postAuthor: MrCrowley » Fri Mar 05, 2010 9:43 pm

It's a combustion cannon. If it was a hybrid, or operated as a hybrid, he would also inject air pressure in to the chamber with the fuel.
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