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The SBDP (simple burst disk pneumatic)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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The SBDP (simple burst disk pneumatic)

Unread postAuthor: Acdcmonkey1991 » Wed May 14, 2008 6:33 pm

It's been a long time since I've posted a cannon, so I thought it was time to make a simple burst disk pneumatic just to test the efficency of using a burst disk. I am actually pretty surprised, at about 100 psi it went through 2 sheets of drywall, with a clean entry and exit. I might put up damage pics later but for now just pictures. I still have not recieved my 1 1/4 in. to 3.8 in. reducer from mcmaster yet, which I will add when I get it because I think it will give the gun a more overall smooth look.
Specs:
C:B ratio- 1:2 (I think)
Ammo- 3.8 in. steel ball bearings
Burst disk- 7 sheets of wax paper (I ran out of Alum. foil)
Barrel- Aluminum, 3/8 in. 3 feet long
Chamber- all steel, 19 inches with fittings
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gun 002.JPG
Overview
somef1 005.JPG
New fitting
Last edited by Acdcmonkey1991 on Thu May 15, 2008 5:15 pm, edited 1 time in total.
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Unread postAuthor: jrrdw » Wed May 14, 2008 6:37 pm

Wax paper, interesting. Never heard of using that before. Good work! :D
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Unread postAuthor: Acdcmonkey1991 » Wed May 14, 2008 6:41 pm

It works pretty well. I wanted to get a test done tongiht, and I was out of aluminum foil so I just thought , hey, why not?
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Unread postAuthor: bigbob12345 » Wed May 14, 2008 6:52 pm

cool, reminds me of my BDMS
Nice job
Though the chamber is probably a little overkill. You will lose not more than 50fps if you make the chamber half the size.
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Unread postAuthor: JDP12 » Wed May 14, 2008 8:04 pm

yea a bit overkill IMHO... but still nice gun
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Unread postAuthor: Acdcmonkey1991 » Thu May 15, 2008 5:07 pm

Overkill because of the steel parts?
Update: got the reducer
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Unread postAuthor: bigbob12345 » Thu May 15, 2008 5:21 pm

No, overkill becasue of the chamber size relitive to the barrel size.
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Unread postAuthor: Carlman » Fri May 23, 2008 5:06 am

hey mate,

does your union seal 100%?

i have made something similar with a galvanized steel union and it still leaks even with bike inner tube for gasket.

thanks man.
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Unread postAuthor: jrrdw » Fri May 23, 2008 6:24 am

Carlman wrote:hey mate,

does your union seal 100%?

i have made something similar with a galvanized steel union and it still leaks even with bike inner tube for gasket.

thanks man.


Try o-rings, sometimes a minor miscut will cause a leak and will be very hard to find exact cause.
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Unread postAuthor: starman » Fri May 23, 2008 9:21 am

Are you using a trigger device to initiate the burst or just filling with air until it bursts? From the gun's apparent simplicity, it appears to be the latter.

Drywall is not going to offer very substantial resistance as target material, even 2 or 3 layers. Try some 3/4" plywood and "2 by" material and see what you get.
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Unread postAuthor: Carlman » Fri May 23, 2008 10:37 am

its all good now thnx jrrdw

im using packing tape and it seals 100% :D with no orings or gasket
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Unread postAuthor: Acdcmonkey1991 » Fri May 23, 2008 2:29 pm

What I did to get it to seal is an o-ring I found that fits perfectly, btw starman, it wasnt drywall, it wazs cement board.
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