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| noname |
 Posted: 08/26/2007 22:19 PM Post subject: The Dangers of a PVC hybrid |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2509
2698.56 Spud Bux
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In my opinion, PVC hybrids are pretty much time bombs, just waiting to go off. This was about the 30th shot, and only at a 2x mixture, but apparently it was too much for the pipe. My friend and I believe that from the stress of the PVC expanding and contracting just a tiny bit, the pipe couldn't take it after a while and blew up. I will never make a PVC hybrid again, and I don't encourage anyone else to either. If you really want the massive power of a hybrid, spend a couple more (literally, not much more) bucks and make from steel, so you can go to extreme mixes without worrying about explosion of the cannon.
http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=6095
FuzzyScorpion's hybrid blew up at a low mixture, for no apparent reason. It was all Sch 80 PVC.
Lucky13's hybrid blew up as well. It had a couple of Sch 40 fittings, but the pressure generated still should have been under the failure pressure of the parts.
It's just an added safety measure. Use steel or iron for a chamber, and you don't have to worry about any kind of explosion (except the one inside the chamber, duh). It's about the same price as Sch 80 PVC anyway, if not cheaper. You also don't have to worry about faulty solvent welds; just use about 1 foot of teflon tape for every fitting 1/2" or smaller, and silicone sealant for anything larger.
If you do make a PVC hybrid, I wouldn't advise using it at more than a 1.5x mixture for it's whole life span.
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| Shrapnel from Lucky13's hybrid. |
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| iPaintball |
| Posted: 08/26/2007 22:22 PM Post subject: |
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Colonel
Joined: 04 Mar 2007
Posts: 709
960.84 Spud Bux
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| Oh no! Is that the DevilStick?
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| noname |
| Posted: 08/26/2007 22:24 PM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2509
2698.56 Spud Bux
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| What I could find of it, yes.
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| hi |
| Posted: 08/26/2007 22:35 PM Post subject: |
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Major General
Joined: 01 Feb 2007
Posts: 1451
1004.40 Spud Bux
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ill bet that was pretty spectacular! you werent hurt were you?
i had the same thing happen to a piston valve of mine, but it obviously wasnt a hybrid, it was a valve.
i think we just have to learn that pvc simply isnt made for making cannons... sure its ok for combustions and low pressure pneumatics, but once you take it over about 150 psi then you need a steel or copper chamber. it is only plastic...
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| frankrede |
| Posted: 08/26/2007 23:08 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 2896
421.43 Spud Bux
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ahhh scary crap right there.
So should I trash my non-remote fire- 4" all sch-80 pvc hybrid?
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| noname |
| Posted: 08/26/2007 23:15 PM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2509
2698.56 Spud Bux
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| Either that or switch to remote firing, from at least 20 feet away. I'd say limit your mixture to 1.5x, or 2x occasionally. Or just use it as a 150-or-so psi burst disc gun; you'll get insane performance as it is.
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| Hotwired |
| Posted: 08/27/2007 7:42 AM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1679
3543.47 Spud Bux
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Guess PVC isn't elastic enough to take the shock load of the hybrid combustion then.
Bring on the metal piping.
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| jackssmirkingrevenge |
| Posted: 08/27/2007 7:53 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6485
9880.03 Spud Bux
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fork in hell 
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| Hailfire753 |
| Posted: 08/27/2007 8:16 AM Post subject: |
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Captain
Joined: 28 Jun 2007
Posts: 315
64.47 Spud Bux
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Geez, I guess my PVC hybrid plans are a no-no then...  .... NOW WHADO I DO!?
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| noname |
| Posted: 08/27/2007 10:20 AM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2509
2698.56 Spud Bux
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You make it out of steel so you have have fun with 6x + mixtures. 
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| paaiyan |
| Posted: 08/27/2007 10:28 AM Post subject: |
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Ascendant Defenestrator
Joined: 27 Dec 2006
Posts: 2055
2622.52 Spud Bux
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| Oh, man, that sucks. How far away were you when it blew?
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| noname |
| Posted: 08/27/2007 10:37 AM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2509
2698.56 Spud Bux
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| Around 3 feet. I was standing next to the barrel though, just in front of the union. I was wondering why nothing left the barrel, and when I looked behind me the back had blown off and there were pieces all over.
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| paaiyan |
| Posted: 08/27/2007 10:53 AM Post subject: |
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Ascendant Defenestrator
Joined: 27 Dec 2006
Posts: 2055
2622.52 Spud Bux
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| So you weren't hurt then, that's good. Good thing you weren't holding it, lol.
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| noname |
| Posted: 08/27/2007 10:55 AM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
Posts: 2509
2698.56 Spud Bux
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| The damn thing had a 10 foot 1 1/2" barrel! How was I supposed to hold it?!?!
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| paaiyan |
| Posted: 08/27/2007 12:55 PM Post subject: |
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Ascendant Defenestrator
Joined: 27 Dec 2006
Posts: 2055
2622.52 Spud Bux
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