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| rocketman |
 Posted: 10/01/2006 16:08 PM Post subject: burst disk material |
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Joined: 01 Oct 2006
Posts: 5
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| it seems that most guys use HDPE for burst disks, what pressure do these burst at? i have been using metal tape on my gun(havn't had a sucessful hybrid shot yet, only pnumatic testing) it is a thin plastic like tape and bursts around 100psi in a 3/4" black iron union with the tapered part facing the barrel. what other materials work well for holding high pressures. |
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| Pete Zaria |
| Posted: 10/01/2006 16:26 PM Post subject: |
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Resident Computer Guru
Joined: 31 Mar 2006
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I don't have a hybrid, but have studied them quite a bit (I hope to build one next year, funding dependant). Most people use several layers of aluminum foil, or discs cut out of a milkjug or soda bottle. Any hard, thin plastic should work. Hope that was kind of helpful.
Peace,
Pete Zaria. |
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| boilingleadbath |
| Posted: 10/02/2006 14:37 PM Post subject: |
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Moderator
Joined: 12 Mar 2005
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| No numbers regarding steel unions, but PET (2 Liter bottle thickness) typicaly slips out of plastic unions at around 100 PSI. |
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| rocketman |
| Posted: 10/02/2006 15:33 PM Post subject: |
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Joined: 01 Oct 2006
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Thanks, all i have to do now is wait for the epoxy to dry around my ignition wires then I can do a real hybrid shot.
I'll try both materials and post the results. |
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| pyro86 |
| Posted: 11/22/2006 14:35 PM Post subject: |
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Joined: 17 Nov 2006
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| I use parchment paper and it bursts @ 45 psi with my 1" union |
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| PVC Arsenal 17 |
| Posted: 11/23/2006 22:20 PM Post subject: |
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WITTY PHRASE
Joined: 27 Mar 2006
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| In my 3/4" PVC union, I use scotch white duct tape. It goes at around 100 psi. |
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| markfh11q |
| Posted: 11/23/2006 22:48 PM Post subject: |
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Magic Dust Man
Joined: 06 May 2006
Posts: 1387
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I use two layers of aluminum foil, and that bursts at around 60 PSI.
BTW, what's your hybrid like? Is it all steel, or is that just the union? |
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| frankrede |
| Posted: 11/23/2006 23:52 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
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Sheet Aluminum, Very thin.
Would it work? |
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| rocketman |
| Posted: 12/04/2006 21:28 PM Post subject: |
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Joined: 01 Oct 2006
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| it was all 3/4"black iron but i could never get it to fire. i now know why, i would have had to use 3psi in my meter pipe, i was using 10. i also had a terrible spark setup. i may revisit it but not right now. it actually didn't cost me anything, i used various stuff laying around my garage. in my pneumatic testing i managed to shoot a sharpie marker about 80yds by accident. the silver metal tape worked the best for me pneumatic. |
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| benstern |
| Posted: 12/04/2006 22:01 PM Post subject: |
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Donating Member
Joined: 21 Sep 2005
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I am gonna use soup can lids for my 20x hybrid.
No idea at what pressures they would burst at.... |
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| rocketman |
| Posted: 12/08/2006 17:01 PM Post subject: |
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Private
Joined: 01 Oct 2006
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lol...a lot.
you better be a long way away from that when it goes off. thats about 300psi before ignition.  |
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