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| VirusX |
 Posted: 03/02/2010 10:32 AM Post subject: How do attach the propane injection with the chamber? |
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Specialist
Joined: 01 Oct 2009
Posts: 42
137.39 Spud Bux
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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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| jrrdw |
| Posted: 03/02/2010 10:37 AM Post subject: |
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Donating Moderator
Joined: 16 Nov 2005
Posts: 5522
9129.22 Spud Bux
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| 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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| Hubb |
| Posted: 03/02/2010 12:37 PM Post subject: |
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Major General
Joined: 28 May 2007
Posts: 2410
701.43 Spud Bux
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| 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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| bighead33 |
| Posted: 03/04/2010 10:19 AM Post subject: |
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Sergeant
Joined: 19 Feb 2010
Posts: 98
179.35 Spud Bux
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| VirusX |
| Posted: 03/05/2010 14:20 PM Post subject: |
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Specialist
Joined: 01 Oct 2009
Posts: 42
137.39 Spud Bux
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| bighead33 wrote: | | THERES A TUTORIAL!!! |
Where is a tutorial!? |
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| MrCrowley |
| Posted: 03/05/2010 15:58 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 8999
9195.37 Spud Bux
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| VirusX wrote: | | bighead33 wrote: | | THERES A TUTORIAL!!! |
Where is a tutorial!? |
Ignore bighead, he's being an ass. |
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| VirusX |
| Posted: 03/05/2010 18:05 PM Post subject: |
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Specialist
Joined: 01 Oct 2009
Posts: 42
137.39 Spud Bux
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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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| MrCrowley |
| Posted: 03/05/2010 20:43 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 8999
9195.37 Spud Bux
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| 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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