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Copper Air Chamber in Propane Metering

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Copper Air Chamber in Propane Metering

Unread postAuthor: kwhee07 » Mon Jul 16, 2007 8:49 am

While getting the parts for my halo rocket launcher at lowes, my friend picked up a piece, because it looked funny. Only seconds later i realized its potential..i think. I snapped a pic, and ill describe what i think it can be used for to save lots of parts. Ive never seen one used before, but it is an air chamber by description, so im guessing it would work

i cant get the pic to send from my phone, but its basically like a .75 in copper tube thats rounded off on one end, and has an open "spout"...think like a 12g co2 but bigger and copper.
used in this setup:
http://www.advancedspuds.com/propane.htm
it would completely replace that chamber on the bottom...i think. has anyone used these?
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Unread postAuthor: spud yeti » Mon Jul 16, 2007 8:55 am

sounds interesting. How much does it cost?
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really good quote/phrase here
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Unread postAuthor: kwhee07 » Mon Jul 16, 2007 9:02 am

I'm not sure. ill try to find one online... 1 sek
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Unread postAuthor: kwhee07 » Mon Jul 16, 2007 9:07 am

http://www.siouxchief.com/B_Product_Det ... pID=150400

I'm pretty sure thats the same piece. All you would need is a fitting to fit that onto the T instead of 3 reducers and a pipe and an end cap...that and it was like 4 bux i think at lowes, so thats gotta be way cheaper

And it being called a bullet air chamber gave me an idea for a new high powered spud gun...i have no idea if it would work at all or be safe or anything, but what if you used the bullet chamber as a projectile, pressurized it with propane, and ignited inside of it,shooting it out of the gun like a missile? its only a start to an idea, but i think with safety considered and work done, it could create a pretty high powered gun
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Last edited by kwhee07 on Mon Jul 16, 2007 9:09 am, edited 2 times in total.

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Unread postAuthor: PVC Arsenal 17 » Mon Jul 16, 2007 9:08 am

I know exactly what you're talking about, but I forget what they're called.

They're just short pieces of copper pipe, closed on one end.
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Unread postAuthor: jimmy101 » Mon Jul 16, 2007 11:09 am

The copper bullet shaped piece of pipe is an anti-hammer device. It is plumbed into the end of a long water line run (like from one end of a house to the other), with the closed end up so it is filled with air.

When a faucet at the end of a long pipe run is closed there is a lot of momentum in the moving column of water in the pipe. Stopping the moving column of water creates a high pressure spike which can damage valves. It also causes the water line to jump and sometimes makes a bang sound as the pipe hits something.

The anti-hammer device is filled with air, when the nearby valve is shut off the moving column of water compresses the air which aborbs the momentum, no pressure spike and no banging of pipes as the move around.
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Unread postAuthor: kwhee07 » Mon Jul 16, 2007 11:54 am

so can we use it or not?
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Unread postAuthor: mark.f » Mon Jul 16, 2007 2:24 pm

Is there some sort of diaphragm or piston inside of various models so that they can be used in any configuration instead of just overhead the end of the pipe? If so, then you'd probably just have to be careful there isn't such a device inside of it.
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Unread postAuthor: kwhee07 » Mon Jul 16, 2007 3:13 pm

as far as i could tell from holding,shaking,looking inside,and blowing in it,theres nothing inside it
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Unread postAuthor: noname » Mon Jul 16, 2007 4:54 pm

You should probably taste it too, just to make sure.
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Unread postAuthor: spudthug » Mon Jul 16, 2007 5:04 pm

yes someone has used them..as an air chamber ironically.. he had 4 of them on one gun. it was all copper and it had a ball valve on it..it was an old gun and i cant seem to find it or remember who built it..
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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: noname » Mon Jul 16, 2007 5:42 pm

That wasn't an old gun, it was only built a couple months ago. I know the guy who made it was a new guy who made a bunch of really cool guns, but I forget what his username was.
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Unread postAuthor: Hawkeye » Mon Jul 16, 2007 6:18 pm

A good water hammer has a piston in it. It is just a plastic disc with an o-ring. The water pressure pushes it back against the cushion of air behind it.
The air behind the piston isn't pressurized until the water compresses it though.
If you use one as the chamber you have to consider that when you put pressure in, you aren't filling the chamber entirely because the air behind the piston is being compressed but isn't actually available for shooting a projectile.
You can actually buy large models that would make a great chamber. I would get rid of the piston in them though.
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Unread postAuthor: Specialist » Mon Jul 16, 2007 8:12 pm

i used one on my first pneumatic which i still need to post... anyway they work great. if you want to put a filling valve on it you have to cut off the back and get an end cap the same size and stick the valve through the whole drilled on the end cap. i will get pics of my gun in a sec. it works great though. i recommend it.
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Attachments
P1010035.JPG
here is the chamber with the end cap on it. it works wonderfully. oh and the duct tape is protecting me (there was a sharp piece of solder (sp?) that cut me so i just taped it).
P1010034.JPG
heres a pic of my messy soldering.
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