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Loudest bang

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Loudest bang

Unread postAuthor: Shadowscion » Sat Apr 21, 2007 12:31 am

Hey, I was just wondering what set up would give me the loudest results in a combustion? I was thinking a burst disk would be the loudest but I am not really sure. I am working on a field cannon type project, trying to make it look authentic and stuff. Here is a preview of what I have planned
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Unread postAuthor: hi » Sat Apr 21, 2007 12:34 am

good luck building that. a very short barrel and a burst disk in a union is the loudest you will get out of it.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

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Unread postAuthor: Bubba05 » Sun Apr 22, 2007 8:40 pm

WOOOW!! Thats huge!

Good luck with it and post some pics when its finished. I would like to see finished artical!

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Unread postAuthor: homeflake210 » Mon Apr 23, 2007 5:10 pm

Would multiple burst discs make it any louder?
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Unread postAuthor: spudthug » Mon Apr 23, 2007 5:13 pm

no it would just not break...or maybe it would...i dont really know ask a pro at combustions....although most of us prefer pneumatics...im done now...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: A-98 » Mon Apr 23, 2007 5:14 pm

i eould go with a pneumatic, have a regged co2 setup and have a piston valve. also, depending on what your using it for, more people will accept it because there is no fire hazard.
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Unread postAuthor: deusXmachina » Mon Apr 23, 2007 7:25 pm

My cousin built a replica of the German cannon Big Bertha out of 4" steel pipe and calcium carbide. We had to stop using it when people a quarter mile away reported windows and plates rattling :oops:. But yeah that was bad idea theatre....I like the idea of using pneumatics because a piston valve makes quite the bang.
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Unread postAuthor: n00b » Thu Apr 26, 2007 10:19 pm

Since the original question was regarding combustion launchers, the loudest setup would be a burst disc in a union. Multiple burst discs would not make the cannon louder, the bang is caused by the release of pressure from the chamber to the atmosphere. Since this cannon seems to be based more on looks (are you using a projectile?), I would recommend no barrel at all, to maximize the bang. The difference in sound volume between pneumatics and combustions is arguable, but combustions have a more authentic "artillery" sound than pneumatics, IMHO.

-n00b
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Unread postAuthor: Juicey » Fri Apr 27, 2007 10:51 am

Where is the actual combustion chamber on this. I assume it is gonna be the inline part on top or is it over-under with the chamber that small pipe on bottom. (i'm guessing that may be there just to make it look more realistic) Would love to see pics when u finish it.
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Unread postAuthor: yuandrew » Fri Apr 27, 2007 11:53 am

My cousin built a replica of the German cannon Big Bertha out of 4" steel pipe and calcium carbide. We had to stop using it when people a quarter mile away reported windows and plates rattling Embarassed. But yeah that was bad idea theatre....I like the idea of using pneumatics because a piston valve makes quite the bang.


The calcium carbide makes acetylene and from a friend's experience with balloon in the desert; people up to a 1/2 mile can hear it go off.
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Unread postAuthor: LGM » Fri Apr 27, 2007 12:48 pm

Go hybrid, even louder.
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Unread postAuthor: Specialist » Fri Apr 27, 2007 5:11 pm

build the cannon out of cellular core and whatch it blow up. that will probably give you a bang close to the soung of an M-80 bottle rocket. and that is extremely loud.
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Unread postAuthor: Bubba05 » Fri Apr 27, 2007 8:54 pm

Yeah and the only problem with that is he could risk harm if it dose explode!
I'd go ith the no barrel mate thats gunna get you your biggest bang


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Unread postAuthor: frankrede » Fri Apr 27, 2007 10:48 pm

n00b wrote:Since the original question was regarding combustion launchers, the loudest setup would be a burst disc in a union. Multiple burst discs would not make the cannon louder, the bang is caused by the release of pressure from the chamber to the atmosphere. Since this cannon seems to be based more on looks (are you using a projectile?), I would recommend no barrel at all, to maximize the bang. The difference in sound volume between pneumatics and combustions is arguable, but combustions have a more authentic "artillery" sound than pneumatics, IMHO.

-n00b

I beg to differ.
When I used to have a union setup on my standard combustion, the thicker the burst disk, the louder.
As, the pressure is being released at a higher pressure when using stonger disks.
I once did 5 layers of aluminum foil in the gun and just with right guard and a 1:1 ratio, I temporarily lost my hearing for 10 seconds and recover from my confusion.

with 1 layer of tin foil, it gave a more pleasant bang.
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