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How To: Know When Your Soda Bottle Chamber Is About To Blow

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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Unread postAuthor: sputnick » Sat Jan 17, 2009 8:50 am

In this case it's close enough to violating forum rules to get rid of it!

Edit by jrrdw.
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Unread postAuthor: POLAND_SPUD » Sat Jan 17, 2009 10:32 am

@sputnick... think before writing something... that's just plain dumb...
I hope you realize what can happen when it explodes prematurely ?
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Unread postAuthor: jeepkahn » Sat Jan 17, 2009 10:53 am

typical soda bottles burst at 300psi, as far as the "works/drano" bombs, I think discussion of them is one of the forum no/nos....
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Unread postAuthor: sputnick » Sat Jan 17, 2009 11:26 am

I know that they're not exactly the safest thing, but they're quick easy and cheap...

as for being a nono, I think I will need to check the rules again...
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Unread postAuthor: Cannibal Corpse » Sat Jan 17, 2009 11:35 am

I had the samething happen to me with a 2liter bottle it got like a tumor coming off of it the size of the bottle it was so weird. I don't know how they can streach so much?
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Unread postAuthor: PVC Arsenal 17 » Sat Jan 17, 2009 11:40 am

I still don't see why anyone would even consider using a soda bottle as a chamber. You need a pipe for a barrel and a valve with pipe threads... you're already halfway there.

I suppose if you needed a low volume clear chamber for whatever reason, you could use a preform. It's a soda bottle before it's heated and inflated to its typical 2-liter shape. You can imagine how thick the walls are.
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Unread postAuthor: sputnick » Sat Jan 17, 2009 11:44 am

Those preforms are just unexpanded water bottle blanks, If you have ever watched how it's made, they heat those and then put them in a mold and blow them up to fit. Since they coast about 5 cents to produce, their profit margin is huge...

although truth be told, I have always wanted to know where to get those.
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Unread postAuthor: PVC Arsenal 17 » Sat Jan 17, 2009 11:49 am

Yeah I know what they are.

CountyComm has them (as well as shitloads of other awesome stuff) or you can get them here.
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Unread postAuthor: jimmy101 » Sat Jan 17, 2009 12:27 pm

POLAND_SPUD wrote:@ MrCrowley very interesting vid.... any idea how many liters of Co2 can you get from 1 kg of dry ice ?

Molecular weight of CO2 is 44. One mole of gas occupies 22.4 liters at STP.
(1000g)/(44g/mol)*(22.4L/mol) = 509 Liters

STP = 20C (68F) and 1 ATM pressure.
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Unread postAuthor: POLAND_SPUD » Sat Jan 17, 2009 1:13 pm

hmmm thx jimmy...
now it seems that dry ice could be used as a cheap source of CO2 for high pressure portable guns.... the only problem is how to use it safely... :?
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Unread postAuthor: maggotman » Sat Jan 17, 2009 1:29 pm

wear do you get dry ice from ??
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Unread postAuthor: CrashTestDummy II » Sat Jan 17, 2009 1:49 pm

If you live in the US, you can get it from Baskin Robins. That's where I get mine :D
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Unread postAuthor: jeepkahn » Sat Jan 17, 2009 2:05 pm

CrashTestDummy II wrote:If you live in the US, you can get it from Baskin Robins. That's where I get mine :D


or Harris Teeter....
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Unread postAuthor: MrCrowley » Sat Jan 17, 2009 3:20 pm

any idea how many liters of Co2 can you get from 1 kg of dry ice

No idea, bet jimmy101, SpudBlaster15, DYI, Rag or some other members who know their chemistry well could tell you though. :)

you are only 17

Yup, still at school :wink:

the bursting pressure lies at about 10ba fo a PET bottle of 1.5L.

Yeah I have heard that before as well. Though I do recall a member taking their soda bottle past 125PSI, it'd be interesting to know how deformed it is at that pressure.


Edit: There's a second page :shock:

I still don't see why anyone would even consider using a soda bottle as a chamber

I agree with you. They're far too dangerous and you have to go out of your way to make the threads work anyway.
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Unread postAuthor: Daltonultra » Sat Jan 17, 2009 3:32 pm

sputnick wrote:These are called Drano bombs, look them up.

Do I have to track down my high-school buddy and take a picture of his replacement thumb/big toe? Yeah, they moved his BIG TOE to replace the thumb he blew off screwing with bleach bombs.
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