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Quick question:

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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Quick question:

Unread postAuthor: sniperx117 » Sat Sep 08, 2007 10:59 am

When loading ammo in a air cannon, does it go all the way or just at the top of the barrel? I ask this because in my combustion, i load the ammo at the end with a up to create more pressure.

BTW, I think I got about 120 PSI with my bike pump. No leaks!
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 08, 2007 11:03 am

Quick answer:

The ammo should be loaded as close to the valve as possible to allow for maximum acceleration
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Unread postAuthor: spud yeti » Sat Sep 08, 2007 11:05 am

It goes all the way to the bottom. To achieve this, use a ram rod, or create a breech (look in how-to section, or search if unsure on a breech)

Damn JSR, you beat me!
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really good quote/phrase here
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Unread postAuthor: sniperx117 » Sat Sep 08, 2007 6:06 pm

I have a 2'' bore, what should i use to test fire it?
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Unread postAuthor: Orpackrat » Sat Sep 08, 2007 6:53 pm

sniperx117 wrote:I have a 2'' bore, what should i use to test fire it?


Use a Finned Nerf Football, they will fit the barrel fairly well.
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K.I.S.S. "Keep It Simple ******"

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Unread postAuthor: dongfang » Sat Sep 08, 2007 7:15 pm

Hi

I have a 2'' bore, what should i use to test fire it?


Errrrrrrr, a spud? A potato?

Just an idea I had.

Regards
Soren
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Unread postAuthor: Hubb » Sat Sep 08, 2007 7:26 pm

sniperx117 wrote:I have a 2'' bore, what should i use to test fire it?


A grapefruit.
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Unread postAuthor: sniperx117 » Sat Sep 08, 2007 9:23 pm

ok, now lets do the math. Say a nerf foot ball right? Its like 2 ounces right?? I have a 2' barrel, and like a 2' chamber. I use a pump and go to like 90 psi. For example. The chamber is made up of like 3 different parts. 2'' width by 3'' length. Reducer to 1.5 width by 2'' then reducer to a 1 inch. Ball valve. C:B Ratio and the psi equation that means....... :?: :?: :?: :shock: :?
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Unread postAuthor: Hubb » Sat Sep 08, 2007 9:27 pm

I'm not quite sure what you mean but find GGDT and use it.
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Unread postAuthor: sniperx117 » Sat Sep 08, 2007 9:46 pm

How far the nerf will fly out:D
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Unread postAuthor: MrCrowley » Sat Sep 08, 2007 10:06 pm

<A HREF="http://thehalls-in-bfe.com/GGDT/installation.html">Download GGDT and put your guns specs into it and it will tell you how far it will fly.<a>
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