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aluminum foil burst pressure

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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aluminum foil burst pressure

Unread postAuthor: A-98 » Tue Jan 23, 2007 11:04 pm

im guessing around 90 psi(for regular foil) ...but you guys would know better....or the burst pressure for paper.
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Unread postAuthor: Pete Zaria » Tue Jan 23, 2007 11:10 pm

I don't have a hybrid nor do I use burst disks in my combustions very frequently, but I can assure you, one layer of heavy duty grocery-store type aluminum foil bursts at MUCH less than 90psi. I'd wager closer to 20.

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Unread postAuthor: MrCrowley » Tue Jan 23, 2007 11:31 pm

Cut out the plastic from milk bottles.That would go around...well im not sure you should find out.
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Unread postAuthor: A-98 » Tue Jan 23, 2007 11:40 pm

shizm...well i was hoping for more then that...what about layering it up...like 3 layers, that would give you 60 or so
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Unread postAuthor: MrCrowley » Tue Jan 23, 2007 11:45 pm

Just use milk bottles,more reliable,how big is your union going ot be? You should get loads of burst disks from a milk bottle.
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Unread postAuthor: A-98 » Tue Jan 23, 2007 11:50 pm

aboot (hehe) 1"...i think...with a 2 inch chamber. and its gonna be a triggered burst disk gun. the only problem i have is that i use the organic paper milk jugs...not the gallon plastic ones. aybe i can use soda can metal...i have like a billion v8s that i never drink.

im gonna make a qev cannon in a month or so...but for now i want to make something and then maybe ill sell it to my friens.
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Unread postAuthor: sergeantspud2 » Tue Jan 23, 2007 11:56 pm

Im using a 1 1/4" union and with one sheet of the cheep grocery store foil it bursts at +-5psi. But then when I layer it like 3 (if I remember correctly) burst at around 25.

Ill have to try out that milk carton idea! I didnt think of that.
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Unread postAuthor: MrCrowley » Tue Jan 23, 2007 11:59 pm

Spose that will work, you might have a high bursting pressure unless like you said its triggered.
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Unread postAuthor: noname » Wed Jan 24, 2007 12:21 am

Plastic soda bottle burst disks hold the most pressure, unless you just want to use thin sheet metal.
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Unread postAuthor: Insomniac » Wed Jan 24, 2007 12:34 am

Tracing paper works well, it holds more that foil (no idea on the exact burst pressure)
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Unread postAuthor: A-98 » Wed Jan 24, 2007 1:43 pm

also i only have a bike pump (one day...one day) so i cant exactly just pump it up to 125 psi or untill it bursts..i need something that bursts at aprox 90-100 psi. i think ill do some test this weekend. i might post em for the greater good of everybody.

and speaking of burst disks, sgort gets the tip of my hat!
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Unread postAuthor: medievalman » Wed Jan 24, 2007 4:34 pm

you could have a burst pressure of over 100 psi, because, as you said, it will be a triggered burst disc gun. just get a thicker material that will still burst when it is punctured. you could use pop can metal like gort did. good luck with this gun.
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Unread postAuthor: A-98 » Wed Jan 24, 2007 5:20 pm

good point..i had thought of that at 11:30 last night while studying for my english test...but i forgot it when i fell asleep. im aming for pressures around 100, so the secondary chamber would be pressureide to ~50. so the 1st one would have to hold 50-60 psi and the second one just ~60.

also, how hard to you have ti puncture a burst disk to get it to fire (like sgorts design) he had a broad head moving pretty fast. cut he was using relatively thiick material. could you just design some sort of solenoid that oul hit it with a needle and would that fire it?
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Unread postAuthor: Bluetooth » Wed Jan 24, 2007 5:46 pm

A solenoid is a small electromagnetically activated valve. What were you thinking?
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Unread postAuthor: LGM » Wed Jan 24, 2007 6:03 pm

You could just stick a nail in the back of whatever you're shooting and drop it in the barrel, mortar style.
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