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Building for the biggest "Boom" sound

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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Building for the biggest "Boom" sound

Unread postAuthor: rootuser » Mon Jun 21, 2010 5:19 pm

Hello everyone,

I'm fairly new to spud guns so please bear with me.

I have built a rocket launcher type cannon already and it works fine. I have a general idea of how to put things together at this point.

My question is:

I would like to build a pneumatic launcher that is basically designed to make the biggest "boom". I am actually not concerned with launching any kind of projectile from it really, and accuracy is not at all needed. Since fire = bad in California's dry climate, I would like to stick to pneumatic to do this. CO2, Air, whatever I don't really mind. I am trying to make as big a noise as possible without the use of combustion essentially.
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Unread postAuthor: Ranger » Mon Jun 21, 2010 5:25 pm

A burst disc make a lot of noise, I have a little 3/4" burst disc Here that makes a big bang.
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Unread postAuthor: kydavies » Mon Jun 21, 2010 5:26 pm

use a ball valve in combonation with a burst disk


edit damn it Ranger you beat me to the post while i was doing my drawing


use a ball valve and a burst disk its safer
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
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Unread postAuthor: clemsonguy1125 » Mon Jun 21, 2010 5:30 pm

Also use a short barrel
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That is all.
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Unread postAuthor: rootuser » Mon Jun 21, 2010 5:32 pm

Thanks for the quick response. I'm not sure I understand how the burst disk is inserted and re-inserted etc but I am sure I Can figure it out. Is there any video any place or sound file anyone has so I can hear one of these?
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Unread postAuthor: SpudFarm » Mon Jun 21, 2010 5:48 pm

rootuser wrote: I'm not sure I understand how the burst disk is inserted and re-inserted


Look in the "hybrid showcase" sub-forum and you will see alot of burst disk guns. They are not pneumatic but you can use the disk setup from them.

Unions is what's used the most.
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Unread postAuthor: Ranger » Mon Jun 21, 2010 7:18 pm

Here's Where I got my idea. Also some of his videos

[youtube]http://www.youtube.com/watch?v=ZbRLW4YPu54&feature=player_embedded[/youtube]

[youtube]http://www.youtube.com/watch?v=cTG0nyB2GQU&feature=player_embedded[/youtube]

Basically (well technically :D) Its a piece of duct tape inbetween a coupler and another piece of pipe. When air is applied the tape bursts and makes a loud POW!

Hint. Sand the coupler and the pipe so that they are a very loose fit this way the duct tape will not be hard to load.

@kydavies: :lol:
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Last edited by Ranger on Mon Jun 21, 2010 10:06 pm, edited 1 time in total.

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Unread postAuthor: Technician1002 » Mon Jun 21, 2010 7:47 pm

On this page there is a sound recording of a 1 inch fast piston valve dry fired at 80 PSI. A burst disk will have more of a pop sound as it opens faster. Fast piston valves are loud with a short barrel. Burst disks are even louder.
http://www.spudfiles.com/forums/presenting-the-mouse-musket-t21108.html The sound file is a wav near the bottom of the first post saved as a zip file. A larger cannon will make a bigger sound.
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Unread postAuthor: Gun Freak » Mon Jun 21, 2010 9:29 pm

Well I'll tell you what, when I put a 2" tee with a hole in the middle on the end of my 1.5" GB barrel, it makes the most piercing bang I have ever heard at 60 psi, I don't dare go 100 psi.... it is a 2" piston valve with a massive 2" chamber BTW.
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Unread postAuthor: kydavies » Mon Jun 21, 2010 9:55 pm

Ranger, a ball valve in combo with a burst disk is mych safer cause you know when its going to go off
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mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
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Unread postAuthor: hi » Mon Jun 21, 2010 10:56 pm

Yep, short barrel and burst disk is going to make a lot of noise. definently have a valve behind the burst disk so you know when its going to fire.
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Unread postAuthor: Gun Freak » Mon Jun 21, 2010 11:09 pm

With a tee muzzle break on the end...
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